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Stojković, Ivana

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Authority KeyName Variants
orcid::0000-0001-7836-4574
  • Stojković, Ivana (2)
  • Stojković Simatović, Ivana (22)
Projects
Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them Lithium-ion batteries and fuel cells - research and development
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200175 (Institute of Technical Sciences of SASA, Belgrade) Serbian Academy of Sciences and Arts, Project F-190
Bilateral cooperation program between the Republic of Serbia and the Republic of Slovenia “Nanostructured and mesoporous functional materials with enhanced solar light driven photocatalytic activity” for 2018–2019 Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200017 (University of Belgrade, Institute of Nuclear Sciences 'Vinča', Belgrade-Vinča)
Magnetic and radionuclide labeled nanostructured materials for medical applications Bilateral cooperation program between the Republic of Serbia and the Republic of Slovenia, Project 651-03-1251/2012-09/05
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200146 (University of Belgrade, Faculty of Physical Chemistry) Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200325 (Military Technical Institute - MTI, Belgrade)
Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing Nanostructured multifunctional materials and nanocomposites
Struktura, termodinamičke i elektrohemijske osobine materijala za konverziju energije i nove tehnologije

Author's Bibliography

Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry

Rajić, Vladimir; Stojković Simatović, Ivana; Veselinović, Ljiljana; Belošević Čavor, Jelena; Novaković, Mirjana; Popović, Maja; Škapin, Srečo Davor; Mojović, Miloš; Stojadinović, Stevan; Rac, Vladislav; Janković Častvan, Ivona; Marković, Smilja

(Royal Society of Chemistry, 2020)

TY  - JOUR
AU  - Rajić, Vladimir
AU  - Stojković Simatović, Ivana
AU  - Veselinović, Ljiljana
AU  - Belošević Čavor, Jelena
AU  - Novaković, Mirjana
AU  - Popović, Maja
AU  - Škapin, Srečo Davor
AU  - Mojović, Miloš
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Janković Častvan, Ivona
AU  - Marković, Smilja
PY  - 2020
UR  - https://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp03377d
UR  - https://dais.sanu.ac.rs/123456789/9544
AB  - Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.
PB  - Royal Society of Chemistry
T2  - Physical Chemistry Chemical Physics
T1  - Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry
SP  - 22078
EP  - 22095
VL  - 22
IS  - 38
DO  - 10.1039/D0CP03377D
ER  - 
@article{
author = "Rajić, Vladimir and Stojković Simatović, Ivana and Veselinović, Ljiljana and Belošević Čavor, Jelena and Novaković, Mirjana and Popović, Maja and Škapin, Srečo Davor and Mojović, Miloš and Stojadinović, Stevan and Rac, Vladislav and Janković Častvan, Ivona and Marković, Smilja",
year = "2020",
url = "https://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp03377d, https://dais.sanu.ac.rs/123456789/9544",
abstract = "Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.",
publisher = "Royal Society of Chemistry",
journal = "Physical Chemistry Chemical Physics",
title = "Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry",
pages = "22078-22095",
volume = "22",
number = "38",
doi = "10.1039/D0CP03377D"
}

HAp:Co as tunable VIS-NIR reflective pigment

Marković, Smilja; Stojanović, Zoran; Veselinović, Ljiljana; Simić, Danica; Samolov, Aleksandra; Stojković Simatović, Ivana

(Belgrade : Military Technical Institute, 2020)

TY  - CONF
AU  - Marković, Smilja
AU  - Stojanović, Zoran
AU  - Veselinović, Ljiljana
AU  - Simić, Danica
AU  - Samolov, Aleksandra
AU  - Stojković Simatović, Ivana
PY  - 2020
UR  - http://www.vti.mod.gov.rs/oteh/elementi/rad/125.pdf
UR  - https://dais.sanu.ac.rs/123456789/10038
AB  - Radar-absorbent materials, used in stealth technology for defense aircrafts, vehicles, satellites, etc. from radar detection, are commonly based on graphite or semiconductive particles embedded in a polymer matrix. In this study, we employed Co2+ ion-substitution to improve Vis-NIR reflectivity of hydroxyapatite (Ca10(PO4)6(OH)2, HAP) powder. HAP:Co with nominally 5 at.% of Co was prepared with hydrothermal processing of a precipitate. Synthesized powder was characterized by XRD, Raman and ATR-FTIR spectroscopy, FE-SEM and TEM. Thermal stability of HAP:Co powder was examined by simultaneous TG-DTA analyzer. To modify its optical properties and obtain powders with a varietty of color tone, the HAP:Co powder was calcined at 800, 1000, and 1100 °C, in an air atmosphere, for 1 hour. Afterward, the calcined particles were used to prepare composites with poly(vinyl butyral), (PVB); the concentration range was 1 wt.% of the HAP:Co in PVB. The composite coatings, in the form of thin films on glass, were prepared by the solvent-casting technique, using ethanol as a fast evaporating solvent. Firstly, the HAP:Co particles were dispersed in ethanol, then PVB was added (Mowital B30H) and dissolved. To evaporate the solvent before spectrophotometric measurements, the coatings on glass were dried at room temperature for 72 hours. To comprehend optical properties of the coatings, diffuse reflection, transmission, and color coordinates were determined. We found that calcined HAP:Co particles have potential to be used in the formulation of coatings for camouflage protection.
PB  - Belgrade : Military Technical Institute
C3  - 9th International Scientific Conference on Defensive Technologies : OTEH2020, Belgrade, Serbia, 15-16 October 2020
T1  - HAp:Co as tunable VIS-NIR reflective pigment
SP  - 475
EP  - 480
ER  - 
@conference{
author = "Marković, Smilja and Stojanović, Zoran and Veselinović, Ljiljana and Simić, Danica and Samolov, Aleksandra and Stojković Simatović, Ivana",
year = "2020",
url = "http://www.vti.mod.gov.rs/oteh/elementi/rad/125.pdf, https://dais.sanu.ac.rs/123456789/10038",
abstract = "Radar-absorbent materials, used in stealth technology for defense aircrafts, vehicles, satellites, etc. from radar detection, are commonly based on graphite or semiconductive particles embedded in a polymer matrix. In this study, we employed Co2+ ion-substitution to improve Vis-NIR reflectivity of hydroxyapatite (Ca10(PO4)6(OH)2, HAP) powder. HAP:Co with nominally 5 at.% of Co was prepared with hydrothermal processing of a precipitate. Synthesized powder was characterized by XRD, Raman and ATR-FTIR spectroscopy, FE-SEM and TEM. Thermal stability of HAP:Co powder was examined by simultaneous TG-DTA analyzer. To modify its optical properties and obtain powders with a varietty of color tone, the HAP:Co powder was calcined at 800, 1000, and 1100 °C, in an air atmosphere, for 1 hour. Afterward, the calcined particles were used to prepare composites with poly(vinyl butyral), (PVB); the concentration range was 1 wt.% of the HAP:Co in PVB. The composite coatings, in the form of thin films on glass, were prepared by the solvent-casting technique, using ethanol as a fast evaporating solvent. Firstly, the HAP:Co particles were dispersed in ethanol, then PVB was added (Mowital B30H) and dissolved. To evaporate the solvent before spectrophotometric measurements, the coatings on glass were dried at room temperature for 72 hours. To comprehend optical properties of the coatings, diffuse reflection, transmission, and color coordinates were determined. We found that calcined HAP:Co particles have potential to be used in the formulation of coatings for camouflage protection.",
publisher = "Belgrade : Military Technical Institute",
journal = "9th International Scientific Conference on Defensive Technologies : OTEH2020, Belgrade, Serbia, 15-16 October 2020",
title = "HAp:Co as tunable VIS-NIR reflective pigment",
pages = "475-480"
}

Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry

Rajić, Vladimir; Stojković Simatović, Ivana; Veselinović, Ljiljana; Belošević Čavor, Jelena; Novaković, Mirjana; Popović, Maja; Škapin, Srečo Davor; Mojović, Miloš; Stojadinović, Stevan; Rac, Vladislav; Janković Častvan, Ivona; Marković, Smilja

(Royal Society of Chemistry, 2020)

TY  - JOUR
AU  - Rajić, Vladimir
AU  - Stojković Simatović, Ivana
AU  - Veselinović, Ljiljana
AU  - Belošević Čavor, Jelena
AU  - Novaković, Mirjana
AU  - Popović, Maja
AU  - Škapin, Srečo Davor
AU  - Mojović, Miloš
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Janković Častvan, Ivona
AU  - Marković, Smilja
PY  - 2020
UR  - https://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp03377d
UR  - https://dais.sanu.ac.rs/123456789/9543
AB  - Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.
PB  - Royal Society of Chemistry
T2  - Physical Chemistry Chemical Physics
T1  - Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry
SP  - 22078
EP  - 22095
VL  - 22
IS  - 38
DO  - 10.1039/D0CP03377D
ER  - 
@article{
author = "Rajić, Vladimir and Stojković Simatović, Ivana and Veselinović, Ljiljana and Belošević Čavor, Jelena and Novaković, Mirjana and Popović, Maja and Škapin, Srečo Davor and Mojović, Miloš and Stojadinović, Stevan and Rac, Vladislav and Janković Častvan, Ivona and Marković, Smilja",
year = "2020",
url = "https://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp03377d, https://dais.sanu.ac.rs/123456789/9543",
abstract = "Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.",
publisher = "Royal Society of Chemistry",
journal = "Physical Chemistry Chemical Physics",
title = "Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry",
pages = "22078-22095",
volume = "22",
number = "38",
doi = "10.1039/D0CP03377D"
}

Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties

Marković, Smilja; Stojković Simatović, Ivana; Ahmetović, Sanita; Veselinović, Ljiljana; Stojadinović, Stevan; Rac, Vladislav; Škapin, Srečo Davor; Bajuk Bogdanović, Danica; Janković Častvan, Ivona; Uskoković, Dragan

(Royal Society of Chemistry, 2019)

TY  - JOUR
AU  - Marković, Smilja
AU  - Stojković Simatović, Ivana
AU  - Ahmetović, Sanita
AU  - Veselinović, Ljiljana
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Škapin, Srečo Davor
AU  - Bajuk Bogdanović, Danica
AU  - Janković Častvan, Ivona
AU  - Uskoković, Dragan
PY  - 2019
UR  - https://pubs.rsc.org/en/content/articlelanding/2019/ra/c9ra02553g
UR  - http://dais.sanu.ac.rs/123456789/6272
AB  - ZnO nanopowders were produced using microwave processing of a precipitate and applied as a photoanode for photoelectrochemical water splitting. Two different surfactants, cetyltrimethylammonium bromide (CTAB) as the cationic and Pluronic F127 as the non-ionic one, were employed to in situ adjust the surface-to-bulk defect ratio in the ZnO crystal structure and further to modify the photo(electro)catalytic activity of the ZnO photoanode. The crystal structure, morphological, textural, optical and photo(electro)catalytic properties of ZnO particles were studied in detail to explain the profound effects of the surfactants on the photoanode activity. The ZnO/CTAB photoanode displayed the highest photocurrent density of 27 mA g−1, compared to ZnO (10.4 mA g−1) and ZnO/F127 photoanodes (20 mA g−1) at 1.5 V vs. SCE in 0.1 M Na2SO4 under visible illumination of 90 mW cm−2. A significant shift of the overpotential toward lower values was also observed when photoanodes were illuminated. The highest shift of the overpotential, from 1.296 to 0.248 V vs. SCE, was recorded when the ZnO/CTAB photanode was illuminated. The ZnO/CTAB photoanode provides efficient charge transfer across the electrode/electrolyte interface, with a longer lifetime of photogenerated electron–hole pairs and reduced possibility of charge recombination. The photoconversion efficiency was improved from 1.4% for ZnO and 0.9% for ZnO/F127 to 4.2% for ZnO/CTAB at 0.510 mV. A simple procedure for the synthesis of ZnO particles with improved photo(electro)catalytic properties was established and it was found that even a small amount of CTAB used during processing of ZnO increases the surface-to-bulk defect ratio. Optimization of the surface-to-bulk defect ratio in ZnO materials enables increase of the absorption capacity for visible light, rendering of the recombination rate of the photogenerated pair, as well as increase of both the photocurrent density and photoconversion efficiency.
PB  - Royal Society of Chemistry
T2  - RSC Advances
T1  - Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties
SP  - 17165
EP  - 17178
VL  - 9
IS  - 30
DO  - 10.1039/C9RA02553G
ER  - 
@article{
author = "Marković, Smilja and Stojković Simatović, Ivana and Ahmetović, Sanita and Veselinović, Ljiljana and Stojadinović, Stevan and Rac, Vladislav and Škapin, Srečo Davor and Bajuk Bogdanović, Danica and Janković Častvan, Ivona and Uskoković, Dragan",
year = "2019",
url = "https://pubs.rsc.org/en/content/articlelanding/2019/ra/c9ra02553g, http://dais.sanu.ac.rs/123456789/6272",
abstract = "ZnO nanopowders were produced using microwave processing of a precipitate and applied as a photoanode for photoelectrochemical water splitting. Two different surfactants, cetyltrimethylammonium bromide (CTAB) as the cationic and Pluronic F127 as the non-ionic one, were employed to in situ adjust the surface-to-bulk defect ratio in the ZnO crystal structure and further to modify the photo(electro)catalytic activity of the ZnO photoanode. The crystal structure, morphological, textural, optical and photo(electro)catalytic properties of ZnO particles were studied in detail to explain the profound effects of the surfactants on the photoanode activity. The ZnO/CTAB photoanode displayed the highest photocurrent density of 27 mA g−1, compared to ZnO (10.4 mA g−1) and ZnO/F127 photoanodes (20 mA g−1) at 1.5 V vs. SCE in 0.1 M Na2SO4 under visible illumination of 90 mW cm−2. A significant shift of the overpotential toward lower values was also observed when photoanodes were illuminated. The highest shift of the overpotential, from 1.296 to 0.248 V vs. SCE, was recorded when the ZnO/CTAB photanode was illuminated. The ZnO/CTAB photoanode provides efficient charge transfer across the electrode/electrolyte interface, with a longer lifetime of photogenerated electron–hole pairs and reduced possibility of charge recombination. The photoconversion efficiency was improved from 1.4% for ZnO and 0.9% for ZnO/F127 to 4.2% for ZnO/CTAB at 0.510 mV. A simple procedure for the synthesis of ZnO particles with improved photo(electro)catalytic properties was established and it was found that even a small amount of CTAB used during processing of ZnO increases the surface-to-bulk defect ratio. Optimization of the surface-to-bulk defect ratio in ZnO materials enables increase of the absorption capacity for visible light, rendering of the recombination rate of the photogenerated pair, as well as increase of both the photocurrent density and photoconversion efficiency.",
publisher = "Royal Society of Chemistry",
journal = "RSC Advances",
title = "Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties",
pages = "17165-17178",
volume = "9",
number = "30",
doi = "10.1039/C9RA02553G"
}
1
6
4
7

Point defect-enhanced optical and photoelectrochemical water splitting activity of nanostructured Zn1-xFeyO(1-x+1.5y)

Marković, Smilja; Rajić, Vladimir B.; Stojković Simatović, Ivana; Veselinović, Ljiljana; Belošević Čavor, Jelena; Ivanovski, Valentin N.; Novaković, Mirjana; Škapin, Srečo Davor; Stojadinović, Stevan; Rac, Vladislav; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2019)

TY  - CONF
AU  - Marković, Smilja
AU  - Rajić, Vladimir B.
AU  - Stojković Simatović, Ivana
AU  - Veselinović, Ljiljana
AU  - Belošević Čavor, Jelena
AU  - Ivanovski, Valentin N.
AU  - Novaković, Mirjana
AU  - Škapin, Srečo Davor
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Uskoković, Dragan
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6677
AB  - Even has been under study since 1935, zinc oxide (ZnO) based materials still attract a huge scientific attention. Owing to a wide band gap energy (3.37 eV at room temperature) and a large exciton binding energy (60 meV) ZnO has a variety of application, e.g. in electronics, optoelectronics, spintronics and photocatalysis. Besides, it has been shown that zinc oxide-based materials have a great potential as photoelectrocatalysts in the processes of water splitting, yielding an increased both photocurrent density and photoconversion efficiency. However, with a band gap energy of 3.37 eV, ZnO is restricted to absorb UV light only. This restriction can be overcome by modifying optical properties of zinc oxide particles. During the years different approaches have been applied to modify the visible light photocatalytic activity of ZnO materials, for example: (1) metal and nonmetal ion doping, (2) hydrogenation, (3) the incorporation of crystalline defects in the form of vacancies and interstitials, (4) the modification of particles morphology and surface topology, etc.
In this study we employed 3d metal ion substitution to improve visible light-driven photoactivity of zinc oxide particles. We investigated the influence of Fe concentration in Zn1-xFeyO(1-x+1.5y) nanoparticles on crystal structure, textural, optical and photoelectrocatalytic properties. Zn1-xFeyO(1-x+1.5y) nanoparticles with nominally 5, 10, 15 and 20 at.% of Fe ions were synthesized by microwave processing of a precipitate. The crystal structure and phase purity of the samples were investigated by X-ray diffraction, Raman and ATR-FTIR spectroscopy. Mössbauer spectroscopy was carried out to clarify the valence state of the iron ions in the ZnO crystal structure. Effects of the iron ions concentration on particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM), transmission electron microscopy (TEM) with elemental mapping, and nitrogen adsorption–desorption isotherm, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence (PL) spectroscopy. Photoelectrochemical activity of the Zn1-xFeyO(1-x+1.5y) samples as anode material was evaluated by linear sweep voltammetry in Na2SO4 electrolyte; the oxygen evolution kinetics were determined and compared. In addition, a series of first principles calculations were performed to address the influence of the iron concentration on the electronic structure of Zn1-xFeyO(1-x+1.5y) samples.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of abstracts / Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019, Herceg Novi, Montenegro, September 2-6, 2019
T1  - Point defect-enhanced optical and photoelectrochemical water splitting activity of nanostructured Zn1-xFeyO(1-x+1.5y)
SP  - 54
EP  - 54
ER  - 
@conference{
author = "Marković, Smilja and Rajić, Vladimir B. and Stojković Simatović, Ivana and Veselinović, Ljiljana and Belošević Čavor, Jelena and Ivanovski, Valentin N. and Novaković, Mirjana and Škapin, Srečo Davor and Stojadinović, Stevan and Rac, Vladislav and Uskoković, Dragan",
year = "2019",
url = "http://dais.sanu.ac.rs/123456789/6677",
abstract = "Even has been under study since 1935, zinc oxide (ZnO) based materials still attract a huge scientific attention. Owing to a wide band gap energy (3.37 eV at room temperature) and a large exciton binding energy (60 meV) ZnO has a variety of application, e.g. in electronics, optoelectronics, spintronics and photocatalysis. Besides, it has been shown that zinc oxide-based materials have a great potential as photoelectrocatalysts in the processes of water splitting, yielding an increased both photocurrent density and photoconversion efficiency. However, with a band gap energy of 3.37 eV, ZnO is restricted to absorb UV light only. This restriction can be overcome by modifying optical properties of zinc oxide particles. During the years different approaches have been applied to modify the visible light photocatalytic activity of ZnO materials, for example: (1) metal and nonmetal ion doping, (2) hydrogenation, (3) the incorporation of crystalline defects in the form of vacancies and interstitials, (4) the modification of particles morphology and surface topology, etc.
In this study we employed 3d metal ion substitution to improve visible light-driven photoactivity of zinc oxide particles. We investigated the influence of Fe concentration in Zn1-xFeyO(1-x+1.5y) nanoparticles on crystal structure, textural, optical and photoelectrocatalytic properties. Zn1-xFeyO(1-x+1.5y) nanoparticles with nominally 5, 10, 15 and 20 at.% of Fe ions were synthesized by microwave processing of a precipitate. The crystal structure and phase purity of the samples were investigated by X-ray diffraction, Raman and ATR-FTIR spectroscopy. Mössbauer spectroscopy was carried out to clarify the valence state of the iron ions in the ZnO crystal structure. Effects of the iron ions concentration on particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM), transmission electron microscopy (TEM) with elemental mapping, and nitrogen adsorption–desorption isotherm, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence (PL) spectroscopy. Photoelectrochemical activity of the Zn1-xFeyO(1-x+1.5y) samples as anode material was evaluated by linear sweep voltammetry in Na2SO4 electrolyte; the oxygen evolution kinetics were determined and compared. In addition, a series of first principles calculations were performed to address the influence of the iron concentration on the electronic structure of Zn1-xFeyO(1-x+1.5y) samples.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of abstracts / Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019, Herceg Novi, Montenegro, September 2-6, 2019",
title = "Point defect-enhanced optical and photoelectrochemical water splitting activity of nanostructured Zn1-xFeyO(1-x+1.5y)",
pages = "54-54"
}

Tuning the optical, electrical and photoelectrocatalytic properties of Zno materials by varying of intrinsic defects concentration

Marković, Smilja; Rajić, Vladimir; Veselinović, Ljiljana; Stojković Simatović, Ivana; Belošević Čavor, Jelena; Škapin, Srečo Davor; Kovač, Janez; Nikolić, Marko G.; Uskoković, Dragan

(Budapest : [s. n.], 2019)

TY  - CONF
AU  - Marković, Smilja
AU  - Rajić, Vladimir
AU  - Veselinović, Ljiljana
AU  - Stojković Simatović, Ivana
AU  - Belošević Čavor, Jelena
AU  - Škapin, Srečo Davor
AU  - Kovač, Janez
AU  - Nikolić, Marko G.
AU  - Uskoković, Dragan
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6997
AB  - During the last decade zinc oxide (ZnO) has attracted considerable attention as a promising material for electronic, optoelectronic and spintronic devices. ZnO has a wide bandgap (3.37 eV at room temperature) and relatively large exciton binding energy (60 meV) which enables multifunctional application. Until now ZnO-based materials have been used as UV and blue light emitters, varistors, thermistors, semiconductors, photoanodes, and other. Various approaches have been applied to improve functional properties of zinc oxide, such as: fabrication of ZnO-based heterojunction particles, particles’ surface sensitization, hydrogenation, etc. It has been found that intrinsic defects (vacancies, interstitials and antisites) in the crystal structure of a ZnO strongly influenced its electrical and optical properties. Thus, correlation of the intrinsic defects concentration with optical and electrical properties of ZnO materials is of great importance for their further application in opto-electronic devices. In this study we investigated the influence of intrinsic defects concentration on the optical, electrical and photoelectrocatalytic properties of ZnO materials. To obtain ZnO powder with a high concentration of intrinsic defects microwave processing of precipitate was employed, while for further varying of defects concentration, the powder was thermally treated in three different atmospheres: air, argon and oxygen. The ZnO powder was uniaxially pressed (P = 100 MPa) in cylindrical compacts (R= 6 mm and h approx. 3 mm) which were sintered in different atmospheres by heating rate of 10 °/min up to 1100 °C, and with dwell time of 1 h. To study a crystal structure of ZnO samples XRD and Raman spectroscopy were used, while for microstructural investigation field emission scanning electron micrographs were recorded. Optical properties were studied using UV–Vis diffuse reflectance spectroscopy. To reveal the role of intrinsic defects in ZnO crystal lattice on functional properties, XPS, photoluminescence, electroluminescence and electrochemical impedance spectra were analyzed. A detailed analysis of the experimental results imply that a high concentration of intrinsic defects, in particular oxygen vacancies, is of the greatest importance for tunable light-emitting diode application and significant for the photoanode properties. To support our experimental observation we performed ab initio calculations based on density functional theory (DFT).
PB  - Budapest : [s. n.]
C3  - Abstracts / International Workshop on Woman in Ceramic Science (WoCeram2019), April 7-9, 2019/ Budapest, Hungary, Novotel Danube Budapest
T1  - Tuning the optical, electrical and photoelectrocatalytic properties of Zno materials by varying of intrinsic defects concentration
SP  - 11
EP  - 11
ER  - 
@conference{
author = "Marković, Smilja and Rajić, Vladimir and Veselinović, Ljiljana and Stojković Simatović, Ivana and Belošević Čavor, Jelena and Škapin, Srečo Davor and Kovač, Janez and Nikolić, Marko G. and Uskoković, Dragan",
year = "2019",
url = "http://dais.sanu.ac.rs/123456789/6997",
abstract = "During the last decade zinc oxide (ZnO) has attracted considerable attention as a promising material for electronic, optoelectronic and spintronic devices. ZnO has a wide bandgap (3.37 eV at room temperature) and relatively large exciton binding energy (60 meV) which enables multifunctional application. Until now ZnO-based materials have been used as UV and blue light emitters, varistors, thermistors, semiconductors, photoanodes, and other. Various approaches have been applied to improve functional properties of zinc oxide, such as: fabrication of ZnO-based heterojunction particles, particles’ surface sensitization, hydrogenation, etc. It has been found that intrinsic defects (vacancies, interstitials and antisites) in the crystal structure of a ZnO strongly influenced its electrical and optical properties. Thus, correlation of the intrinsic defects concentration with optical and electrical properties of ZnO materials is of great importance for their further application in opto-electronic devices. In this study we investigated the influence of intrinsic defects concentration on the optical, electrical and photoelectrocatalytic properties of ZnO materials. To obtain ZnO powder with a high concentration of intrinsic defects microwave processing of precipitate was employed, while for further varying of defects concentration, the powder was thermally treated in three different atmospheres: air, argon and oxygen. The ZnO powder was uniaxially pressed (P = 100 MPa) in cylindrical compacts (R= 6 mm and h approx. 3 mm) which were sintered in different atmospheres by heating rate of 10 °/min up to 1100 °C, and with dwell time of 1 h. To study a crystal structure of ZnO samples XRD and Raman spectroscopy were used, while for microstructural investigation field emission scanning electron micrographs were recorded. Optical properties were studied using UV–Vis diffuse reflectance spectroscopy. To reveal the role of intrinsic defects in ZnO crystal lattice on functional properties, XPS, photoluminescence, electroluminescence and electrochemical impedance spectra were analyzed. A detailed analysis of the experimental results imply that a high concentration of intrinsic defects, in particular oxygen vacancies, is of the greatest importance for tunable light-emitting diode application and significant for the photoanode properties. To support our experimental observation we performed ab initio calculations based on density functional theory (DFT).",
publisher = "Budapest : [s. n.]",
journal = "Abstracts / International Workshop on Woman in Ceramic Science (WoCeram2019), April 7-9, 2019/ Budapest, Hungary, Novotel Danube Budapest",
title = "Tuning the optical, electrical and photoelectrocatalytic properties of Zno materials by varying of intrinsic defects concentration",
pages = "11-11"
}

Structural, photocatalytic and photoelectrochemical characteristics of ZnO nanoparticles synthesized by a glycine-nitrate process

Dojčinović, Milena; Stojković Simatović, Ivana; Marković, Smilja; Janković Častvan, Ivona; Bajuk Bogdanović, Danica; Stojadinović, Stevan; Rac, Vladislav; Nikolić, Maria Vesna

(Budapest : [s. n.], 2019)

TY  - CONF
AU  - Dojčinović, Milena
AU  - Stojković Simatović, Ivana
AU  - Marković, Smilja
AU  - Janković Častvan, Ivona
AU  - Bajuk Bogdanović, Danica
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Nikolić, Maria Vesna
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6998
AB  - Zinc oxide is a semiconductor material which still, after a century of scientific research, shows great potential in modern day utilisements such as heterogenous photocatalysis of organic pollutants and as a photoanode material for efficient water splitting and oxygen generation. In this work zinc oxide was synthesized by a glycine-nitrate combustion process, which is a cheap, simple and efficient method for synthesizing transition metal oxides. The obtained powder was calcined at 400 and 500 °C and samples were characterized in detail using X-ray powder diffraction (XRPD), Fourier-trasform infrared spectroscopy (FTIR), Raman spectroscopy, field emission scanning electron microscopy (FESEM), photoluminescence spectroscopy (PL) and UV-Vis diffuse reflectance spectroscopy (DRS). Photoelectrocatalytic properties were investigated via electrochemical methods: linear voltammetry (LV), chronoamperometry (CA) and impedance spectroscopy (EIS). The results show that the obtained samples are nanocrystalline wurtzite zinc oxide with no impurities, with average particle diameters of 33 nm (annealed at 400 °C) and 48 nm (annealed at 500 °C). Both samples show significant amounts of various crystal deffects. The determined zinc oxide band gap was lower than the band gap of bulk zinc oxide. Photoelectrochemical measurements revealed that this material is photostable and reactive to light. Water oxidation is enhanced by exposing the light. Finally, photocatalytic properties were tested via determining kinetic parameters of organic pollutant decomposition. Both samples showed excellent photocatalytic activity by decomposing methylene blue and phenol.
PB  - Budapest : [s. n.]
C3  - Abstracts / International Workshop on Woman in Ceramic Science (WoCeram2019), April 7-9, 2019/ Budapest, Hungary, Novotel Danube Budapest
T1  - Structural, photocatalytic and photoelectrochemical characteristics of ZnO nanoparticles synthesized by a glycine-nitrate process
SP  - 16
EP  - 16
ER  - 
@conference{
author = "Dojčinović, Milena and Stojković Simatović, Ivana and Marković, Smilja and Janković Častvan, Ivona and Bajuk Bogdanović, Danica and Stojadinović, Stevan and Rac, Vladislav and Nikolić, Maria Vesna",
year = "2019",
url = "http://dais.sanu.ac.rs/123456789/6998",
abstract = "Zinc oxide is a semiconductor material which still, after a century of scientific research, shows great potential in modern day utilisements such as heterogenous photocatalysis of organic pollutants and as a photoanode material for efficient water splitting and oxygen generation. In this work zinc oxide was synthesized by a glycine-nitrate combustion process, which is a cheap, simple and efficient method for synthesizing transition metal oxides. The obtained powder was calcined at 400 and 500 °C and samples were characterized in detail using X-ray powder diffraction (XRPD), Fourier-trasform infrared spectroscopy (FTIR), Raman spectroscopy, field emission scanning electron microscopy (FESEM), photoluminescence spectroscopy (PL) and UV-Vis diffuse reflectance spectroscopy (DRS). Photoelectrocatalytic properties were investigated via electrochemical methods: linear voltammetry (LV), chronoamperometry (CA) and impedance spectroscopy (EIS). The results show that the obtained samples are nanocrystalline wurtzite zinc oxide with no impurities, with average particle diameters of 33 nm (annealed at 400 °C) and 48 nm (annealed at 500 °C). Both samples show significant amounts of various crystal deffects. The determined zinc oxide band gap was lower than the band gap of bulk zinc oxide. Photoelectrochemical measurements revealed that this material is photostable and reactive to light. Water oxidation is enhanced by exposing the light. Finally, photocatalytic properties were tested via determining kinetic parameters of organic pollutant decomposition. Both samples showed excellent photocatalytic activity by decomposing methylene blue and phenol.",
publisher = "Budapest : [s. n.]",
journal = "Abstracts / International Workshop on Woman in Ceramic Science (WoCeram2019), April 7-9, 2019/ Budapest, Hungary, Novotel Danube Budapest",
title = "Structural, photocatalytic and photoelectrochemical characteristics of ZnO nanoparticles synthesized by a glycine-nitrate process",
pages = "16-16"
}

Synthesis temperature influence on the structure, morphology and electrochemical performance of NaxMnO2 as cathode materials for sodium-ion rechearchable batteries

Rakočević, Lazar; Potočnik, Jelena; Novaković, Mirjana; Jugović, Dragana; Stojković Simatović, Ivana

(Belgrade : Institute of Technical Sciences of SASA, 2019)

TY  - CONF
AU  - Rakočević, Lazar
AU  - Potočnik, Jelena
AU  - Novaković, Mirjana
AU  - Jugović, Dragana
AU  - Stojković Simatović, Ivana
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6972
AB  - The lithium-ion batteries are the most commonly used for energy storage in portable devices. Since lithium is relatively rare on earth but rapidly consumed, it is necessary to find an adequate replacement. Owing to the similar chemical properties of sodium and lithium, but much higher availability, sodium ion batteries are one of the best candidates to replace lithium-ion batteries. A variety of materials such as manganese oxide, vanadium oxide or phosphate can be used as an electrode material (anode and cathode) in sodium ion batteries due to the high ability of intercalation of sodium. In this work, NaxMnO2 powder was synthesized by glycine nitrate method. The precursor powder was annealed for four hours at different temperatures: 800, 850, 900 and 950 °C. The characterization of the obtained materials was carried out using following methods: X-ray diffraction (XRD), scanning electron spectroscopy with energy dispersive X-ray spectroscopy (SEM/EDS) and transmission electron spectroscopy with energy dispersive Xray spectroscopy (TEM/EDS). Electrochemical properties were studied using cyclic voltammetry and chronopotentiometry in an aqueous solution of NaNO3. The layer structured Na0.7MnO2.05 with sheet-like morphology and Na0.4MnO2 with 3-D tunnel structure and rod-like morphology was obtained at 800 oC and 900 oC respectively. Na0.44MnO2 with rod-like morphology was annealed at 900 and 950 oC. 3D-tunnel structure Na0.44MnO2 obtained at 900 oC showed the best electrochemical behaviour in aqueous NaNO3 solution.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
T1  - Synthesis temperature influence on the structure, morphology and electrochemical performance of NaxMnO2 as cathode materials for sodium-ion rechearchable batteries
SP  - 59
EP  - 59
ER  - 
@conference{
author = "Rakočević, Lazar and Potočnik, Jelena and Novaković, Mirjana and Jugović, Dragana and Stojković Simatović, Ivana",
year = "2019",
url = "http://dais.sanu.ac.rs/123456789/6972",
abstract = "The lithium-ion batteries are the most commonly used for energy storage in portable devices. Since lithium is relatively rare on earth but rapidly consumed, it is necessary to find an adequate replacement. Owing to the similar chemical properties of sodium and lithium, but much higher availability, sodium ion batteries are one of the best candidates to replace lithium-ion batteries. A variety of materials such as manganese oxide, vanadium oxide or phosphate can be used as an electrode material (anode and cathode) in sodium ion batteries due to the high ability of intercalation of sodium. In this work, NaxMnO2 powder was synthesized by glycine nitrate method. The precursor powder was annealed for four hours at different temperatures: 800, 850, 900 and 950 °C. The characterization of the obtained materials was carried out using following methods: X-ray diffraction (XRD), scanning electron spectroscopy with energy dispersive X-ray spectroscopy (SEM/EDS) and transmission electron spectroscopy with energy dispersive Xray spectroscopy (TEM/EDS). Electrochemical properties were studied using cyclic voltammetry and chronopotentiometry in an aqueous solution of NaNO3. The layer structured Na0.7MnO2.05 with sheet-like morphology and Na0.4MnO2 with 3-D tunnel structure and rod-like morphology was obtained at 800 oC and 900 oC respectively. Na0.44MnO2 with rod-like morphology was annealed at 900 and 950 oC. 3D-tunnel structure Na0.44MnO2 obtained at 900 oC showed the best electrochemical behaviour in aqueous NaNO3 solution.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia",
title = "Synthesis temperature influence on the structure, morphology and electrochemical performance of NaxMnO2 as cathode materials for sodium-ion rechearchable batteries",
pages = "59-59"
}

Enhanced photo(electro)catalytic properties of ZnO particles synthesized by CTAB-assisted microwave processing

Marković, Smilja; Stojković Simatović, Ivana; Ahmetović, Sanita; Veselinović, Ljiljana; Stojadinović, Stevan; Rac, Vladislav; Škapin, Srečo Davor; Uskoković, Dragan

(Belgrade : Society of Physical Chemists of Serbia, 2018)

TY  - CONF
AU  - Marković, Smilja
AU  - Stojković Simatović, Ivana
AU  - Ahmetović, Sanita
AU  - Veselinović, Ljiljana
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4561
AB  - ZnO/CTAB powder was prepared by microwave processing of a precipitate with the aid of cetyltrimethylammonium bromide (CTAB). The effects of CTAB on the crystal structure, morphology, optical and photo(electro)catalytic properties of ZnO particles were studied. The results showed that CTAB did not influenced crystal structure or phase purity of ZnO. However, even low concentration of CTAB vary particles morphology; cone-like particles were prepared by processing without CTAB, while a mixture of spheroidal and plate-like ZnO particles were produced when 0.001 M CTAB was used. It was found that synthesized ZnO powders have 0.10 eV lower band gap energy then bulk ZnO (3.37 eV). A high photocatalytic activity for decolorization of methylene blue water solution was established after 2 h of sunlight irradiation; efficiency was 100 and 67% for ZnO/CTAB and ZnO, respectively. Electrochemical test showed faster oxygen evolution kinetics when ZnO/CTAB was used as anode material. Enhanced photo(electro)catalytic activities of ZnO/CTAB particles are attributed to better absorption of visible light due to both, larger dimensions and surface sensitization by CTAB.
PB  - Belgrade : Society of Physical Chemists of Serbia
C3  - Physical Chemistry 2018 : proceedings. Vol. 1 / 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2018, Belgrade
T1  - Enhanced photo(electro)catalytic properties of ZnO particles synthesized by CTAB-assisted microwave processing
SP  - 237
EP  - 240
ER  - 
@conference{
author = "Marković, Smilja and Stojković Simatović, Ivana and Ahmetović, Sanita and Veselinović, Ljiljana and Stojadinović, Stevan and Rac, Vladislav and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4561",
abstract = "ZnO/CTAB powder was prepared by microwave processing of a precipitate with the aid of cetyltrimethylammonium bromide (CTAB). The effects of CTAB on the crystal structure, morphology, optical and photo(electro)catalytic properties of ZnO particles were studied. The results showed that CTAB did not influenced crystal structure or phase purity of ZnO. However, even low concentration of CTAB vary particles morphology; cone-like particles were prepared by processing without CTAB, while a mixture of spheroidal and plate-like ZnO particles were produced when 0.001 M CTAB was used. It was found that synthesized ZnO powders have 0.10 eV lower band gap energy then bulk ZnO (3.37 eV). A high photocatalytic activity for decolorization of methylene blue water solution was established after 2 h of sunlight irradiation; efficiency was 100 and 67% for ZnO/CTAB and ZnO, respectively. Electrochemical test showed faster oxygen evolution kinetics when ZnO/CTAB was used as anode material. Enhanced photo(electro)catalytic activities of ZnO/CTAB particles are attributed to better absorption of visible light due to both, larger dimensions and surface sensitization by CTAB.",
publisher = "Belgrade : Society of Physical Chemists of Serbia",
journal = "Physical Chemistry 2018 : proceedings. Vol. 1 / 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2018, Belgrade",
title = "Enhanced photo(electro)catalytic properties of ZnO particles synthesized by CTAB-assisted microwave processing",
pages = "237-240"
}

Synthesis and characterisation of ZnO synthesized by glycine-nitrate combustion process

Dojčinović, Milena; Marković, Smilja; Stojadinović, S.; Rac, Vladislav; Janković Častvan, Ivona; Stojković Simatović, Ivana

(Belgrade : Institute of Technical Sciences of SASA, 2018)

TY  - CONF
AU  - Dojčinović, Milena
AU  - Marković, Smilja
AU  - Stojadinović, S.
AU  - Rac, Vladislav
AU  - Janković Častvan, Ivona
AU  - Stojković Simatović, Ivana
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4717
AB  - One of the ways to get rid of toxic organic compounds that industries release into natural waters is photocatalysis of the decomposition of organic compounds on the surface of heterogenous photocatalysts such as zinc oxide. Zinc oxide is a semiconductor that interacts with UV and near-UV visible light by generating electron-hole pairs which decompose organic molecules. Therefore it is useful to explore different ways of synthesizing zinc oxide and to test quality and quantity of organic decomposition photocatalysis so as to enable the commercial use of the material. Zinc oxide is also a respectable material for use as a photoelectrocatalyst in water oxidation, for example, which can be useful for generating oxygen while using natural sunlight - a clean and abundant energy source. In this project nanocrystalline zinc oxide was synthesized by glycin-nitrate combustion process and the powder was annealed on temperatures of 400 °C and 500 °C. Obtained particles where characterized in detail using X-ray powder diffraction (XRPD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, field emission scanning microscopy (FESEM), photoluminescence spectroscopy (PL) and diffuse reflectance spectroscopy (DRS). The results show that obtained samples are nanocrystalline wurtzite zinc oxide, with particle diameters of 33 nm (annealed at 400 °C) ad 48 nm (annealed at 500 °C). Both samples show significant amount of various crystal defects. Zinc oxide band gap of the samples are determined to be lower than the band gap of the bulk zinc oxide. Photoelectrocatalytic properties were investigated via electrochemical methods: linear voltammetry (LV), chronoamperometry (CA) and impedance spectroscopy (EIS). The results show that material is photostable and reactive to the light. Water oxidation is enhanced by exposing to sunlight. Finally, photocatalytic properties are tested with determining kinetic parameters of phenole and methyl blue decomposition. Zinc oxide nanoparticles are efficient photocatalysts, although sample annealed at 500 °C shows better properties than sample annealed at 400 °C.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of Abstracts / Seventeenth Young Researchers' Conference Materials Sciences and Engineering, December 5-7, 2018, Belgrade, Serbia
T1  - Synthesis and characterisation of ZnO synthesized by glycine-nitrate combustion process
SP  - 78
EP  - 78
ER  - 
@conference{
author = "Dojčinović, Milena and Marković, Smilja and Stojadinović, S. and Rac, Vladislav and Janković Častvan, Ivona and Stojković Simatović, Ivana",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4717",
abstract = "One of the ways to get rid of toxic organic compounds that industries release into natural waters is photocatalysis of the decomposition of organic compounds on the surface of heterogenous photocatalysts such as zinc oxide. Zinc oxide is a semiconductor that interacts with UV and near-UV visible light by generating electron-hole pairs which decompose organic molecules. Therefore it is useful to explore different ways of synthesizing zinc oxide and to test quality and quantity of organic decomposition photocatalysis so as to enable the commercial use of the material. Zinc oxide is also a respectable material for use as a photoelectrocatalyst in water oxidation, for example, which can be useful for generating oxygen while using natural sunlight - a clean and abundant energy source. In this project nanocrystalline zinc oxide was synthesized by glycin-nitrate combustion process and the powder was annealed on temperatures of 400 °C and 500 °C. Obtained particles where characterized in detail using X-ray powder diffraction (XRPD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, field emission scanning microscopy (FESEM), photoluminescence spectroscopy (PL) and diffuse reflectance spectroscopy (DRS). The results show that obtained samples are nanocrystalline wurtzite zinc oxide, with particle diameters of 33 nm (annealed at 400 °C) ad 48 nm (annealed at 500 °C). Both samples show significant amount of various crystal defects. Zinc oxide band gap of the samples are determined to be lower than the band gap of the bulk zinc oxide. Photoelectrocatalytic properties were investigated via electrochemical methods: linear voltammetry (LV), chronoamperometry (CA) and impedance spectroscopy (EIS). The results show that material is photostable and reactive to the light. Water oxidation is enhanced by exposing to sunlight. Finally, photocatalytic properties are tested with determining kinetic parameters of phenole and methyl blue decomposition. Zinc oxide nanoparticles are efficient photocatalysts, although sample annealed at 500 °C shows better properties than sample annealed at 400 °C.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of Abstracts / Seventeenth Young Researchers' Conference Materials Sciences and Engineering, December 5-7, 2018, Belgrade, Serbia",
title = "Synthesis and characterisation of ZnO synthesized by glycine-nitrate combustion process",
pages = "78-78"
}

Structural, morphological and optical characteristics of ZnO particles synthesized in the presence of surfactants CTAB and Pluronic F-127

Ahmetović, Sanita; Stojadinović, Stevan; Rac, Vladislav; Škapin, Srečo Davor; Stojković Simatović, Ivana; Marković, Smilja

(Belgrade : Institute of Technical Sciences of SASA, 2018)

TY  - CONF
AU  - Ahmetović, Sanita
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Škapin, Srečo Davor
AU  - Stojković Simatović, Ivana
AU  - Marković, Smilja
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4724
AB  - Due to its optical and electrical properties, low toxicity, chemical and physical stability, as well as inexpensiveness, zinc oxide (ZnO) based materials have a great potential to be used as photoelectrode in photo(electro)catalysis. Photo(electro)catalytic activity of ZnO materials can be improved by modification of particles morphology and surface topology. In this work, the influence of two different surfactants: cetyltrimethylammonium bromide (CTAB) and Pluronic F-127, on the crystal structure, morphology, optical and photo(electro)catalytic properties of ZnO particles, were examined. ZnO powders were synthesized by microwave processing of a precipitate which was previously prepared by "drop by drop" method in the presence of the surfactants. The crystal structure and phase purity of the ZnO particles were determined by X-ray diffraction and Raman spectroscopy. The effects of the surfactants on ZnO particles morphology were examined by the field emission scanning electron microscopy (FE-SEM). The optical properties were studied using UV-Vis diffuse reflectance and photoluminescence spectroscopy. Photocatalytic activity was examined via decolorization of methylene blue under direct sunlight irradiation. It was found that synthesized ZnO powders have a significant photocatalytic activity. Electrochemical properties were studied using linear sweep voltammetry and impedance spectroscopy in Na2SO4 electrolyte. ZnO powder synthesized in the presence of CTAB (ZnO/CTAB) showed the most significant reduction of potential and the fastest kinetic of oxygen evolution.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of Abstracts / Seventeenth Young Researchers' Conference Materials Sciences and Engineering, December 5-7, 2018, Belgrade, Serbia
T1  - Structural, morphological and optical characteristics of ZnO particles synthesized in the presence of surfactants CTAB and Pluronic F-127
SP  - 66
EP  - 66
ER  - 
@conference{
author = "Ahmetović, Sanita and Stojadinović, Stevan and Rac, Vladislav and Škapin, Srečo Davor and Stojković Simatović, Ivana and Marković, Smilja",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4724",
abstract = "Due to its optical and electrical properties, low toxicity, chemical and physical stability, as well as inexpensiveness, zinc oxide (ZnO) based materials have a great potential to be used as photoelectrode in photo(electro)catalysis. Photo(electro)catalytic activity of ZnO materials can be improved by modification of particles morphology and surface topology. In this work, the influence of two different surfactants: cetyltrimethylammonium bromide (CTAB) and Pluronic F-127, on the crystal structure, morphology, optical and photo(electro)catalytic properties of ZnO particles, were examined. ZnO powders were synthesized by microwave processing of a precipitate which was previously prepared by "drop by drop" method in the presence of the surfactants. The crystal structure and phase purity of the ZnO particles were determined by X-ray diffraction and Raman spectroscopy. The effects of the surfactants on ZnO particles morphology were examined by the field emission scanning electron microscopy (FE-SEM). The optical properties were studied using UV-Vis diffuse reflectance and photoluminescence spectroscopy. Photocatalytic activity was examined via decolorization of methylene blue under direct sunlight irradiation. It was found that synthesized ZnO powders have a significant photocatalytic activity. Electrochemical properties were studied using linear sweep voltammetry and impedance spectroscopy in Na2SO4 electrolyte. ZnO powder synthesized in the presence of CTAB (ZnO/CTAB) showed the most significant reduction of potential and the fastest kinetic of oxygen evolution.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of Abstracts / Seventeenth Young Researchers' Conference Materials Sciences and Engineering, December 5-7, 2018, Belgrade, Serbia",
title = "Structural, morphological and optical characteristics of ZnO particles synthesized in the presence of surfactants CTAB and Pluronic F-127",
pages = "66-66"
}

Synthesis and characterization of Na0.4MnO2 as cathode material for aqueous sodium-ion batteries

Rakočević, Lazar; Novaković, Mirjana; Potočnik, Jelena; Jugović, Dragana; Stojković Simatović, Ivana

(Belgrade : Institute of Technical Sciences of SASA, 2018)

TY  - CONF
AU  - Rakočević, Lazar
AU  - Novaković, Mirjana
AU  - Potočnik, Jelena
AU  - Jugović, Dragana
AU  - Stojković Simatović, Ivana
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4726
AB  - The application of rechargeable batteries is growing significantly and there is a need for developing cheaper batteries with good performances. Sodium-ion batteries could be a viable option due to higher abundance of sodium against lithium mineral resources, its low price and similar principles intercalate Na+ ions as Li+ ions in lithium-ion batteries. Different materials as manganese oxides and vanadium oxide are used as electrode materials in sodium batteries. Na0.44MnO2 was regarded as one of the most promising cathode materials for sodium-ion batteries due to its high specific capacity and good cyclability. In this work, Na0.4MnO2 was synthesized using glycine-nitrate method (GNM). The structure of synthesized powder was characterized by X-Ray Diffraction (XRD), while the particles morphology was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The elemental mapping was performed by energy-dispersive Xray spectroscopy (EDS). XRD results showed that the phase structure of Na0.4MnO2 was orthorhombic with tunnel structure. TEM and SEM micrographs of obtained powder material showed uniformed rod-like shape particles with the average lengths and widths of 300 nm and 80 nm, respectively and EDS analysis confirmed that the sample contains Na, Mn, and O in an appropriate ration. The electrochemical behavior of Na0.4MnO2 was investigated by cyclic voltammetry (CV) in a saturated aqueous solution of NaNO3 at scan rates from 20 to 400 mV•s-1. The initial discharge capacity of Na0.4MnO2 in NaNO3 solution was 50 mA•h•g- 1, while after 15 cycles its value increased for 9%. while the efficiency (the ratio of the capacity charge and discharge) was amounting to ~ 95%. This indicates that material synthesized by GNM can be used as cathode material in aqueous sodium-ion batteries
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of Abstracts / Seventeenth Young Researchers' Conference Materials Sciences and Engineering, December 5-7, 2018, Belgrade, Serbia
T1  - Synthesis and characterization of Na0.4MnO2 as cathode material for aqueous sodium-ion batteries
SP  - 48
EP  - 48
ER  - 
@conference{
author = "Rakočević, Lazar and Novaković, Mirjana and Potočnik, Jelena and Jugović, Dragana and Stojković Simatović, Ivana",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4726",
abstract = "The application of rechargeable batteries is growing significantly and there is a need for developing cheaper batteries with good performances. Sodium-ion batteries could be a viable option due to higher abundance of sodium against lithium mineral resources, its low price and similar principles intercalate Na+ ions as Li+ ions in lithium-ion batteries. Different materials as manganese oxides and vanadium oxide are used as electrode materials in sodium batteries. Na0.44MnO2 was regarded as one of the most promising cathode materials for sodium-ion batteries due to its high specific capacity and good cyclability. In this work, Na0.4MnO2 was synthesized using glycine-nitrate method (GNM). The structure of synthesized powder was characterized by X-Ray Diffraction (XRD), while the particles morphology was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The elemental mapping was performed by energy-dispersive Xray spectroscopy (EDS). XRD results showed that the phase structure of Na0.4MnO2 was orthorhombic with tunnel structure. TEM and SEM micrographs of obtained powder material showed uniformed rod-like shape particles with the average lengths and widths of 300 nm and 80 nm, respectively and EDS analysis confirmed that the sample contains Na, Mn, and O in an appropriate ration. The electrochemical behavior of Na0.4MnO2 was investigated by cyclic voltammetry (CV) in a saturated aqueous solution of NaNO3 at scan rates from 20 to 400 mV•s-1. The initial discharge capacity of Na0.4MnO2 in NaNO3 solution was 50 mA•h•g- 1, while after 15 cycles its value increased for 9%. while the efficiency (the ratio of the capacity charge and discharge) was amounting to ~ 95%. This indicates that material synthesized by GNM can be used as cathode material in aqueous sodium-ion batteries",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of Abstracts / Seventeenth Young Researchers' Conference Materials Sciences and Engineering, December 5-7, 2018, Belgrade, Serbia",
title = "Synthesis and characterization of Na0.4MnO2 as cathode material for aqueous sodium-ion batteries",
pages = "48-48"
}

Na0.44Mn02 as a cathode material for aqueous sodium-ion batteries

Gezović, Aleksandra; Vujković, Milica; Jugović, Dragana; Janković Častvan, Ivona; Stojković Simatović, Ivana

(Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade, 2018)

TY  - CONF
AU  - Gezović, Aleksandra
AU  - Vujković, Milica
AU  - Jugović, Dragana
AU  - Janković Častvan, Ivona
AU  - Stojković Simatović, Ivana
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4570
AB  - The application of rechargeable batteries is growing significantly and it became the nlost important field for largescale electric energy storage. While lithiuln-ion batteries (LIBs) have great commercial success, due to their large energy and power density, their application was limited because of the availability of lithiunl and its high cost. Sodiunl-ion batteries (SIBs) can be a promissing alternative due to the huge availability of sodium, its low price and similar intercalating electrochelnistry to LIBs. Among various Na-ion battery materials, low-cost and tunnel-type, Na0.44Mn02 (NMO) was regarded as one of the most pronlising cathode materials for sodium-ion batteries, because of its high theoretical specific capacity (122 rnA h g1) and good cyclability [2]. In this work, for the synthesis of NMO powder, rapid glycine-nitrate nlethod (GNM) was used, which, on the basis of the literature review, has not been used to synthesize this material so far.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
PB  - Belgrade : Hydrogen Economy Initiative Serbia
C3  - Program and the Book of Abstracts / 3rd International Symposium on Materials for Energy Storage and Conversion - mESC-IS 2018
T1  - Na0.44Mn02 as a cathode material for aqueous sodium-ion batteries
SP  - 89
EP  - 89
ER  - 
@conference{
author = "Gezović, Aleksandra and Vujković, Milica and Jugović, Dragana and Janković Častvan, Ivona and Stojković Simatović, Ivana",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4570",
abstract = "The application of rechargeable batteries is growing significantly and it became the nlost important field for largescale electric energy storage. While lithiuln-ion batteries (LIBs) have great commercial success, due to their large energy and power density, their application was limited because of the availability of lithiunl and its high cost. Sodiunl-ion batteries (SIBs) can be a promissing alternative due to the huge availability of sodium, its low price and similar intercalating electrochelnistry to LIBs. Among various Na-ion battery materials, low-cost and tunnel-type, Na0.44Mn02 (NMO) was regarded as one of the most pronlising cathode materials for sodium-ion batteries, because of its high theoretical specific capacity (122 rnA h g1) and good cyclability [2]. In this work, for the synthesis of NMO powder, rapid glycine-nitrate nlethod (GNM) was used, which, on the basis of the literature review, has not been used to synthesize this material so far.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade : Hydrogen Economy Initiative Serbia",
journal = "Program and the Book of Abstracts / 3rd International Symposium on Materials for Energy Storage and Conversion - mESC-IS 2018",
title = "Na0.44Mn02 as a cathode material for aqueous sodium-ion batteries",
pages = "89-89"
}

Synthesis, characterization and electrochemical properties of Na0.44MnO2 in NaNO3 and LiNO3 aqueous solution

Gezović, Aleksandra; Vujković, Milica; Jugović, Dragana; Janković Častvan, Ivona; Stojković Simatović, Ivana; Mentus, Slavko

(Belgrade : Society of Physical Chemists of Serbia, 2018)

TY  - CONF
AU  - Gezović, Aleksandra
AU  - Vujković, Milica
AU  - Jugović, Dragana
AU  - Janković Častvan, Ivona
AU  - Stojković Simatović, Ivana
AU  - Mentus, Slavko
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4562
AB  - Na0.44MnO2 synthesized by glycine-nitrate method (GNM) was described in
this paper and it was characterized by X-ray powder diffraction (XRD) and
field-emission scanning electron microscopy (FE-SEM). Electrochemical
performances of Na0.44MnO2 were studied by cycling voltammetry (CV) at
various scan rates in NaNO3 and LiNO3 aqueous solutions in order to
compare the intercalation/deintercalation kinetics of Li+ and Na+ ions. The
initial discharge capacity was found to be 27.1 and 27.44 in the aqueous
solution of NaNO3 and LiNO3, respectively, and after 30 cycles its values
increased for 12% in both electrolytes.
PB  - Belgrade : Society of Physical Chemists of Serbia
C3  - Physical Chemistry 2018 : proceedings. Vol. 1 / 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2018
T1  - Synthesis, characterization and electrochemical properties of Na0.44MnO2 in NaNO3 and LiNO3 aqueous solution
SP  - 407
EP  - 410
ER  - 
@conference{
author = "Gezović, Aleksandra and Vujković, Milica and Jugović, Dragana and Janković Častvan, Ivona and Stojković Simatović, Ivana and Mentus, Slavko",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4562",
abstract = "Na0.44MnO2 synthesized by glycine-nitrate method (GNM) was described in
this paper and it was characterized by X-ray powder diffraction (XRD) and
field-emission scanning electron microscopy (FE-SEM). Electrochemical
performances of Na0.44MnO2 were studied by cycling voltammetry (CV) at
various scan rates in NaNO3 and LiNO3 aqueous solutions in order to
compare the intercalation/deintercalation kinetics of Li+ and Na+ ions. The
initial discharge capacity was found to be 27.1 and 27.44 in the aqueous
solution of NaNO3 and LiNO3, respectively, and after 30 cycles its values
increased for 12% in both electrolytes.",
publisher = "Belgrade : Society of Physical Chemists of Serbia",
journal = "Physical Chemistry 2018 : proceedings. Vol. 1 / 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2018",
title = "Synthesis, characterization and electrochemical properties of Na0.44MnO2 in NaNO3 and LiNO3 aqueous solution",
pages = "407-410"
}

CTAB- and pluronic F-127-assisted microwave processing of ZnO particles with modified morphology and optical properties

Marković, Smilja; Stojković Simatović, Ivana; Ahmetović, Sanita; Veselinović, Ljiljana; Stojadinović, Stevan; Rac, Vladislav; Škapin, Srečo Davor; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2018)

TY  - CONF
AU  - Marković, Smilja
AU  - Stojković Simatović, Ivana
AU  - Ahmetović, Sanita
AU  - Veselinović, Ljiljana
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/3664
AB  - Zinc oxide-based materials have a great potential to be applied as photocatalysts in the processes of removal of organic and biological pollutants from drinking and wastewaters. A major drawback of ZnO as visible-light absorber is a band energy gap of 3.37 eV, which restricts the material to absorb UV light only. This drawback can be overcame by modifying the optical absorption properties of zinc oxide particles. Different approaches have been applied to modify the visible light photocatalytic activity of ZnO materials: (1) metal and nonmetal ion doping, (2) hydrogenation, (3) the incorporation of crystalline defects in the form of vacancies and interstitials, (4) the modification of particles morphology and surface topology, etc. In this study we investigated the influence of different surfactants on the morphology, optical properties and functionality of ZnO particles. Two different surfactants were employed during microwave processing of ZnO particles, cetyltrimethylammonium bromide (CTAB) as cationic and Pluronic F-127 as non-ionic one. The crystal structure and phase purity of the ZnO particles were determined by X-ray diffraction and Raman spectroscopy. Effects of the surfactants on particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM) and nitrogen adsorption–desorption isotherm, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence (PL) spectroscopy. Functionality of ZnO particles was studied due to their photocatalytic and electrochemical activities. Photocatalytic activity was examined via decolorization of methylene blue under direct sunlight irradiation. Electrochemical behavior of the ZnO samples as anode material was evaluated by linear sweep voltammetry in Na2SO4 electrolyte; the oxygen evolution kinetics were determined and compared.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018
T1  - CTAB- and pluronic F-127-assisted microwave processing of ZnO particles with modified morphology and optical properties
SP  - 70
EP  - 70
ER  - 
@conference{
author = "Marković, Smilja and Stojković Simatović, Ivana and Ahmetović, Sanita and Veselinović, Ljiljana and Stojadinović, Stevan and Rac, Vladislav and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/3664",
abstract = "Zinc oxide-based materials have a great potential to be applied as photocatalysts in the processes of removal of organic and biological pollutants from drinking and wastewaters. A major drawback of ZnO as visible-light absorber is a band energy gap of 3.37 eV, which restricts the material to absorb UV light only. This drawback can be overcame by modifying the optical absorption properties of zinc oxide particles. Different approaches have been applied to modify the visible light photocatalytic activity of ZnO materials: (1) metal and nonmetal ion doping, (2) hydrogenation, (3) the incorporation of crystalline defects in the form of vacancies and interstitials, (4) the modification of particles morphology and surface topology, etc. In this study we investigated the influence of different surfactants on the morphology, optical properties and functionality of ZnO particles. Two different surfactants were employed during microwave processing of ZnO particles, cetyltrimethylammonium bromide (CTAB) as cationic and Pluronic F-127 as non-ionic one. The crystal structure and phase purity of the ZnO particles were determined by X-ray diffraction and Raman spectroscopy. Effects of the surfactants on particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM) and nitrogen adsorption–desorption isotherm, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence (PL) spectroscopy. Functionality of ZnO particles was studied due to their photocatalytic and electrochemical activities. Photocatalytic activity was examined via decolorization of methylene blue under direct sunlight irradiation. Electrochemical behavior of the ZnO samples as anode material was evaluated by linear sweep voltammetry in Na2SO4 electrolyte; the oxygen evolution kinetics were determined and compared.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018",
title = "CTAB- and pluronic F-127-assisted microwave processing of ZnO particles with modified morphology and optical properties",
pages = "70-70"
}

Synthesis and Characterization of Na0.4MnO2 as a Positive Electrode Material for an Aqueous Electrolyte Sodium-ion Energy Storage Device

Rakočević, Lazar; Novaković, Mirjana; Potočnik, Jelena; Jugović, Dragana; Stojković Simatović, Ivana

(Belgrade : Serbian Academy of Sciences and Arts, 2018)

TY  - CONF
AU  - Rakočević, Lazar
AU  - Novaković, Mirjana
AU  - Potočnik, Jelena
AU  - Jugović, Dragana
AU  - Stojković Simatović, Ivana
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/3628
AB  - Due to the increasing use of batteries in everyday life and in industry, there is a need for developing cheaper batteries than the widely used lithium ion batteries. Lower price and higher abundance of sodium compared to lithium mineral resources intensified the development of Na-ion batteries. Aqueous lithium/ sodium rechargeable batteries have attracted considerable attention for energy storage because they do not contain flammable organic electrolytes as commercial batteries do, the ionic conductivity of the aqueous electrolyte is about two orders of magnitude higher than in non-aqueous electrolyte and the electrolyte salt and solvent are cheaper. Various materials such as manganese oxides, vanadium oxide and phosphates have been used as electrode materials (cathodic and anodic) in sodium batteries due to high sodium intercalation ability in both, organic and aqueous electrolytes. The most frequently used type of manganese oxides are Li–Mn–O or Na–Mn–O systems due to their tunnel or layered crystal structures which facilitate the lithium/sodium intercalation-deintercalation. In this work, a glycine-nitrate method (GNM) was applied for the synthesis of cathode material Na0.4MnO2.
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
T1  - Synthesis and Characterization of Na0.4MnO2 as a Positive Electrode Material for an Aqueous Electrolyte Sodium-ion Energy Storage Device
SP  - 154
EP  - 156
ER  - 
@conference{
author = "Rakočević, Lazar and Novaković, Mirjana and Potočnik, Jelena and Jugović, Dragana and Stojković Simatović, Ivana",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/3628",
abstract = "Due to the increasing use of batteries in everyday life and in industry, there is a need for developing cheaper batteries than the widely used lithium ion batteries. Lower price and higher abundance of sodium compared to lithium mineral resources intensified the development of Na-ion batteries. Aqueous lithium/ sodium rechargeable batteries have attracted considerable attention for energy storage because they do not contain flammable organic electrolytes as commercial batteries do, the ionic conductivity of the aqueous electrolyte is about two orders of magnitude higher than in non-aqueous electrolyte and the electrolyte salt and solvent are cheaper. Various materials such as manganese oxides, vanadium oxide and phosphates have been used as electrode materials (cathodic and anodic) in sodium batteries due to high sodium intercalation ability in both, organic and aqueous electrolytes. The most frequently used type of manganese oxides are Li–Mn–O or Na–Mn–O systems due to their tunnel or layered crystal structures which facilitate the lithium/sodium intercalation-deintercalation. In this work, a glycine-nitrate method (GNM) was applied for the synthesis of cathode material Na0.4MnO2.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia",
title = "Synthesis and Characterization of Na0.4MnO2 as a Positive Electrode Material for an Aqueous Electrolyte Sodium-ion Energy Storage Device",
pages = "154-156"
}

Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite

Marković, Smilja; Stojković Simatović, Ivana; Stanković, Ana; Škapin, Srečo Davor; Mančić, Lidija; Mentus, Slavko; Uskoković, Dragan

(Belgrade : Serbian Academy of Sciences and Arts, 2018)

TY  - CONF
AU  - Marković, Smilja
AU  - Stojković Simatović, Ivana
AU  - Stanković, Ana
AU  - Škapin, Srečo Davor
AU  - Mančić, Lidija
AU  - Mentus, Slavko
AU  - Uskoković, Dragan
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/3631
AB  - Due to their high photoactivity, photostability, chemical inertness, simple syntheses procedures as well as low cost, semiconductor materials such as TiO2, ZnO, V2O5, and SnO2, are recognized as materials with a great potential for photoelectrochemical and photocatalytic applications. In particular, they can be used as photoanode in the process of photoelectrolysis of water, or to initiate decomposition of different organic or biological pollutants in water under light irradiation. Which wavelength of light will be absorbed depends on the semiconductor band gap; semiconductors with a wide band gap (> 3 eV) can absorb light in the UV range only, while those with a narrow band gap (< 3 eV) can be activated by visible light. Current trend in photo(electro)catalysis is to develop efficient semiconductors which can be activated by absorbing natural sunlight. During the years, various approaches have been developed to modify optical properties of semiconductors thus to be capable to absorb sunlight, for example: the incorporation of transition metal ions or defects into the crystal structure, the particles’ surface sensitization, hydrogenation, coupling of semiconductors with different band gap energies, etc.
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
T1  - Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite
SP  - 151
EP  - 153
ER  - 
@conference{
author = "Marković, Smilja and Stojković Simatović, Ivana and Stanković, Ana and Škapin, Srečo Davor and Mančić, Lidija and Mentus, Slavko and Uskoković, Dragan",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/3631",
abstract = "Due to their high photoactivity, photostability, chemical inertness, simple syntheses procedures as well as low cost, semiconductor materials such as TiO2, ZnO, V2O5, and SnO2, are recognized as materials with a great potential for photoelectrochemical and photocatalytic applications. In particular, they can be used as photoanode in the process of photoelectrolysis of water, or to initiate decomposition of different organic or biological pollutants in water under light irradiation. Which wavelength of light will be absorbed depends on the semiconductor band gap; semiconductors with a wide band gap (> 3 eV) can absorb light in the UV range only, while those with a narrow band gap (< 3 eV) can be activated by visible light. Current trend in photo(electro)catalysis is to develop efficient semiconductors which can be activated by absorbing natural sunlight. During the years, various approaches have been developed to modify optical properties of semiconductors thus to be capable to absorb sunlight, for example: the incorporation of transition metal ions or defects into the crystal structure, the particles’ surface sensitization, hydrogenation, coupling of semiconductors with different band gap energies, etc.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia",
title = "Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite",
pages = "151-153"
}

Zinc oxide-based materials with enhanced sunlight-driven photo- and photo-electro-catalytic activity

Marković, Smilja; Rajić, Vladimir B.; Stojković Simatović, Ivana; Uskoković, Dragan

(Belgrade : Serbian Ceramic Society, 2017)

TY  - CONF
AU  - Marković, Smilja
AU  - Rajić, Vladimir B.
AU  - Stojković Simatović, Ivana
AU  - Uskoković, Dragan
PY  - 2017
UR  - http://dais.sanu.ac.rs/123456789/4773
AB  - Current trend in photocatalysis is to develop efficient semiconductors which can be activated by absorbing sunlight. Which wavelength of sunlight will be absorbed depends on the semiconductor band gap; semiconductors with a wide band gap (> 3 eV) can absorb only UV light (5% of sunlight), while those with a narrow band gap (< 3 eV) can be activated by visible light (45% of sunlight). Zinc oxide (ZnO) is promising semiconductor with band gap of 3.37 eV. Various approaches have been applied to modify its optical properties, for example: incorporation of different metal and nonmetal ions or defects into the crystal structure, particles’ surface sensitization or hydrogenation. In this study, we examined the influence of different defects present in ZnO particles on their photo- and photo-electro-catalytic properties. Processing of ZnO particles were carried out in order to introduce: (1) lattice defects, through microwave procedure, (2) surface defects, through mechanical activation, and (3) surface defects, trough composite with polyethylene oxide. Synthesized particles were characterized by XRD, FESEM, laser diffraction particle size analyzer, Raman, UV-Vis diffuse reflectance and photoluminescence spectroscopy. The results of achieved photo- and photo-electro-catalytic tests indicate that both, structural and surface, defects enhanced sunlight-driven activity of ZnO particles.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017
T1  - Zinc oxide-based materials with enhanced sunlight-driven photo- and photo-electro-catalytic activity
SP  - 57
EP  - 57
ER  - 
@conference{
author = "Marković, Smilja and Rajić, Vladimir B. and Stojković Simatović, Ivana and Uskoković, Dragan",
year = "2017",
url = "http://dais.sanu.ac.rs/123456789/4773",
abstract = "Current trend in photocatalysis is to develop efficient semiconductors which can be activated by absorbing sunlight. Which wavelength of sunlight will be absorbed depends on the semiconductor band gap; semiconductors with a wide band gap (> 3 eV) can absorb only UV light (5% of sunlight), while those with a narrow band gap (< 3 eV) can be activated by visible light (45% of sunlight). Zinc oxide (ZnO) is promising semiconductor with band gap of 3.37 eV. Various approaches have been applied to modify its optical properties, for example: incorporation of different metal and nonmetal ions or defects into the crystal structure, particles’ surface sensitization or hydrogenation. In this study, we examined the influence of different defects present in ZnO particles on their photo- and photo-electro-catalytic properties. Processing of ZnO particles were carried out in order to introduce: (1) lattice defects, through microwave procedure, (2) surface defects, through mechanical activation, and (3) surface defects, trough composite with polyethylene oxide. Synthesized particles were characterized by XRD, FESEM, laser diffraction particle size analyzer, Raman, UV-Vis diffuse reflectance and photoluminescence spectroscopy. The results of achieved photo- and photo-electro-catalytic tests indicate that both, structural and surface, defects enhanced sunlight-driven activity of ZnO particles.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017",
title = "Zinc oxide-based materials with enhanced sunlight-driven photo- and photo-electro-catalytic activity",
pages = "57-57"
}

Morfološke i elektrohemijske karakteristike prahova LiFePO4 sintetisanih u prisustvu različitih karboksilnih kiselina

Stojković Simatović, Ivana; Jugović, Dragana; Cvjetićanin, Nikola; Vujković, Milica; Kuzmanović, Maja

(Belgrade Univerzitet u Beogradu, Fakultet za fizičku hemiju, 2017)

@phdthesis{
editor = "Stojković Simatović, Ivana, Jugović, Dragana, Cvjetićanin, Nikola, Vujković, Milica",
author = "Kuzmanović, Maja",
year = "2017",
url = "http://dais.sanu.ac.rs/123456789/15988, http://eteze.bg.ac.rs/application/showtheses?thesesId=5007, http://nardus.mpn.gov.rs/123456789/8260",
abstract = "Predmet istraživanja ove doktorske disertacije je ispitivanje mogućnosti dobijanja prahova litijum gvožđe(II) fosfata (LiFePO4) novim i modifikovanim načinima sinteze. Zahvaljujući svojoj sposobnosti da reverzibilno interkalira/deinterkalira jone litijuma ovaj materijal se koristi kao katoda u litijum jonskim baterijama. Osnovni cilj ovih istraživanja je bio da se dobije čist materijal bez prisustva nečistoća, koji će imati pogodne fizičkohemijske karakteristike za elektrohemijsku primenu. Parametri kristalne građe mogu značajno uticati na elektrohemijske osobine, tako da je cilj istraživanja bio da se ovaj uticaj razjasni i da se sintetišu materijali koji bi u ovom smislu imali najoptimalniju morfologiju i ostale mikrostrukturne osobine. Polazeći iz vodenih rastvora, koji su se sastojali od jona litijuma, gvožđa i fosfora pomešanih u odnosu koji zadovoljava stehiometriju LiFePO4 i odgovarajuće karboksilne kiseline, dobijene su prekursorske smeše mikroemulzionom metodom, koprecipitacijom i liofilizacijom koje su dalje termički tretirane. Prekursorska smeša dobijena mikroemulzionom metodom je solvotermalno tretirana na temperaturi od 180 oC, dok su prekursorske smeše dobijene koprecipitacijom i liofilizacijom termički tretirane na visokim temperaturama (600-800 oC) u cilju dobijanja kristalnog praha LiFePO4. Korišćenjem eksperimentalnih tehnika rendgenske difrakcije na prahu, skenirajuće elektronske mikroskopije, Mesbauerove spektroskopije, rasejanja laserske svetlosti, termičke analize i elektrohemijske analize ispitan je uticaj različitih karboksilnih kiselina kao redukcionog sredstva i izvora ugljenika na morfološke i elektrohemijske karakteristike sintetisanih prahova., The subject of this PhD thesis is investigation of possibility to synthesize lithium iron (II) phosphate (LiFePO4) powders with new and modified synthesis procedures. Due to its ability to reversibly intercalate/deintercalate lithium ions, this material is used as a cathode in lithium ion batteries. The main objective of this research was to synthesize pure material without any phase impurities, which would have appropriate physical chemical properties for electrochemical applications. Crystal lattice parameters can significantly influence electrochemical properties, and this thesis aim is to clarify this relation and to synthesize materials with optimal morphology and other microstructural properties. Starting from mixed aqueous solution of lithium, phosphorus and iron ions in stoichiometric ratio and different carboxylic acids, precursors mixtures were prepared by microemulsion, coprecipitation and lyophilisation techniques, and afterwards were thermally treated. To prepare crystal LiFePO4 powders, microemulsion-derived precursor mixture was solvothermally treated at 180 oC, while precursor mixtures obtained by coprecipitation and lyophilisation were thermally treated at high temperatures (600-800 oC). X-ray powder diffraction, scanning electron microscopy, Mossbauer spectroscopy, laser light scattering, and thermal and electrochemical analyses were used to investigate the influence of different carboxylic acids as reducing agents and carbon sources on morphological and electrochemical properties of synthesized powders",
publisher = "Belgrade Univerzitet u Beogradu, Fakultet za fizičku hemiju",
title = "Morfološke i elektrohemijske karakteristike prahova LiFePO4 sintetisanih u prisustvu različitih karboksilnih kiselina, Morfological and electrochemical properties of LiFePO4 powders synthesized in presence of different carboxylic acids"
}

Synthesis of Li2FeSiO4/C composite by sol-gel citric acid assisted method

Milović, Miloš; Jugović, Dragana; Mitrić, Miodrag; Stojković Simatović, Ivana; Škapin, Srečo Davor; Uskoković, Dragan

(Belgrade : Union of Engineers and Technicians of Serbia, 2016)

TY  - JOUR
AU  - Milović, Miloš
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Stojković Simatović, Ivana
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://scindeks.ceon.rs/article.aspx?artid=0040-21761602181M
UR  - http://www.ncbi.nlm.nih.gov/pubmed/0040-21761602181M
UR  - http://dais.sanu.ac.rs/123456789/3360
AB  - This paper describes a procedure for the synthesis of the composite Li2FeSiO4/C by sol-gel method using citric acid as a chelating agent; the resulting gel precursor was thermally treated in a slightly reductive atmosphere of nitrogen with five percent of hydrogen, whereupon the in situ decomposition of citric acid to carbon occurs during formation of the Li2FeSiO4. The obtained nanocrystalline powder (with mean crystallite size of 27nm) crystallized in the P21/n space group as confirmed by X-ray diffractometry. The morphology of the powder was examined by scanning electron microscopy which revealed a wide distribution of particles by size, from 100 to 500 nm. The material has been tested as cathode in lithium-ion cell and exhibits high efficiency and almost theoretical capacity.
AB  - U ovom radu opisan je postupak sinteze kompozita Li2FeSiO4/C sol-gel metodom koristeći limunsku kiselinu kao helatni agens; dobijeni gel-prekursor termički je tretiran u blago redukcionoj atmosferi azota sa pet posto vodonika, pri čemu dolazi do in situ razlaganja limunske kiseline do ugljenika za vreme nastanka Li2FeSiO4. Dobijeni nanokristalniprah (srednje veličine kristalita 27 nm) kristalisao je u P21/n prostornoj grupi što je potvrđeno rendgenskom difraktometrijom. Morfologija praha ispitana je skanirajućom elektronskom mikroskopijom koja otkriva široku raspodelu čestica po veličini, od 100 - 500 nm. Materijal je ispitan kao katoda u litijum-jonskoj ćeliji i pokazuje visoku efikasnost i praktično teorijski kapacitet.
PB  - Belgrade : Union of Engineers and Technicians of Serbia
T2  - Tehnika
T1  - Synthesis of Li2FeSiO4/C composite by sol-gel citric acid assisted method
T1  - Sinteza kompozita Li2FeSiO4/C sol-gel metodom uz pomoć limunske kiseline
SP  - 181
EP  - 184
VL  - 71
IS  - 2
DO  - 10.5937/tehnika1602181M
ER  - 
@article{
author = "Milović, Miloš and Jugović, Dragana and Mitrić, Miodrag and Stojković Simatović, Ivana and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2016",
url = "https://scindeks.ceon.rs/article.aspx?artid=0040-21761602181M, http://www.ncbi.nlm.nih.gov/pubmed/0040-21761602181M, http://dais.sanu.ac.rs/123456789/3360",
abstract = "This paper describes a procedure for the synthesis of the composite Li2FeSiO4/C by sol-gel method using citric acid as a chelating agent; the resulting gel precursor was thermally treated in a slightly reductive atmosphere of nitrogen with five percent of hydrogen, whereupon the in situ decomposition of citric acid to carbon occurs during formation of the Li2FeSiO4. The obtained nanocrystalline powder (with mean crystallite size of 27nm) crystallized in the P21/n space group as confirmed by X-ray diffractometry. The morphology of the powder was examined by scanning electron microscopy which revealed a wide distribution of particles by size, from 100 to 500 nm. The material has been tested as cathode in lithium-ion cell and exhibits high efficiency and almost theoretical capacity., U ovom radu opisan je postupak sinteze kompozita Li2FeSiO4/C sol-gel metodom koristeći limunsku kiselinu kao helatni agens; dobijeni gel-prekursor termički je tretiran u blago redukcionoj atmosferi azota sa pet posto vodonika, pri čemu dolazi do in situ razlaganja limunske kiseline do ugljenika za vreme nastanka Li2FeSiO4. Dobijeni nanokristalniprah (srednje veličine kristalita 27 nm) kristalisao je u P21/n prostornoj grupi što je potvrđeno rendgenskom difraktometrijom. Morfologija praha ispitana je skanirajućom elektronskom mikroskopijom koja otkriva široku raspodelu čestica po veličini, od 100 - 500 nm. Materijal je ispitan kao katoda u litijum-jonskoj ćeliji i pokazuje visoku efikasnost i praktično teorijski kapacitet.",
publisher = "Belgrade : Union of Engineers and Technicians of Serbia",
journal = "Tehnika",
title = "Synthesis of Li2FeSiO4/C composite by sol-gel citric acid assisted method, Sinteza kompozita Li2FeSiO4/C sol-gel metodom uz pomoć limunske kiseline",
pages = "181-184",
volume = "71",
number = "2",
doi = "10.5937/tehnika1602181M"
}

The use of methylcellulose for the synthesis of Li2FeSiO4/C composites

Milović, Miloš; Jugović, Dragana; Mitrić, Miodrag; Dominko, Robert; Stojković Simatović, Ivana; Jokić, Bojan; Uskoković, Dragan

(Springer, 2016)

TY  - JOUR
AU  - Milović, Miloš
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Dominko, Robert
AU  - Stojković Simatović, Ivana
AU  - Jokić, Bojan
AU  - Uskoković, Dragan
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/2318
AB  - The key parameters related to cathode materials for commercial use are a high specific capacity, good cycling stability, capacity retention at high current rates, as well as the simplicity of the synthesis process. This study presents a facile synthesis of a composite cathode material, Li2FeSiO4 with carbon, under extreme conditions: rapid heating, short dwell at 750 °C and subsequent quenching. The water-soluble polymer methylcellulose was used both as an excellent dispersing agent and a carbon source that pyrolytically degrades to carbon, thereby enabling the homogeneous deployment of the precursor compounds and the control of the Li2FeSiO4 particle growth from the earliest stage of processing. X-ray powder diffraction reveals the formation of Li2FeSiO4 nanocrystallites with a monoclinic structure in the P21/n space group (#14). The composite’s electrochemical performance as a cathode material in Li-ion batteries was examined. The influence of the amount of methylcellulose on the microstructural, morphological, conductive, and electrochemical properties of the obtained powders has been discussed. It has been shown that the overall electrochemical performance is improved with an increase of carbon content, through both the decrease of the mean particle diameter and the increase of electrical conductivity.
PB  - Springer
T2  - Cellulose
T1  - The use of methylcellulose for the synthesis of Li2FeSiO4/C composites
SP  - 239
EP  - 246
VL  - 23
IS  - 1
DO  - 10.1007/s10570-015-0806-9
ER  - 
@article{
author = "Milović, Miloš and Jugović, Dragana and Mitrić, Miodrag and Dominko, Robert and Stojković Simatović, Ivana and Jokić, Bojan and Uskoković, Dragan",
year = "2016",
url = "http://dais.sanu.ac.rs/123456789/2318",
abstract = "The key parameters related to cathode materials for commercial use are a high specific capacity, good cycling stability, capacity retention at high current rates, as well as the simplicity of the synthesis process. This study presents a facile synthesis of a composite cathode material, Li2FeSiO4 with carbon, under extreme conditions: rapid heating, short dwell at 750 °C and subsequent quenching. The water-soluble polymer methylcellulose was used both as an excellent dispersing agent and a carbon source that pyrolytically degrades to carbon, thereby enabling the homogeneous deployment of the precursor compounds and the control of the Li2FeSiO4 particle growth from the earliest stage of processing. X-ray powder diffraction reveals the formation of Li2FeSiO4 nanocrystallites with a monoclinic structure in the P21/n space group (#14). The composite’s electrochemical performance as a cathode material in Li-ion batteries was examined. The influence of the amount of methylcellulose on the microstructural, morphological, conductive, and electrochemical properties of the obtained powders has been discussed. It has been shown that the overall electrochemical performance is improved with an increase of carbon content, through both the decrease of the mean particle diameter and the increase of electrical conductivity.",
publisher = "Springer",
journal = "Cellulose",
title = "The use of methylcellulose for the synthesis of Li2FeSiO4/C composites",
pages = "239-246",
volume = "23",
number = "1",
doi = "10.1007/s10570-015-0806-9"
}
2
3
3

The incorporation of vanadium into olivine LiFePO4/C: improvement of lithium intercalation from both organic and aqueous electrolyte

Vujković, Milica; Jugović, Dragana; Mitrić, Miodrag; Stojković Simatović, Ivana; Cvjetićanin, Nikola; Mentus, Slavko

(Belgrade : Materials Research Society of Serbia, 2013)

TY  - CONF
AU  - Vujković, Milica
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Stojković Simatović, Ivana
AU  - Cvjetićanin, Nikola
AU  - Mentus, Slavko
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/407
AB  - The simple and fast (malonic acid+glycine)-assisted gel-combustion process, followed by a heat treatment at 750oC under reductive atmosphere, is found to be a very effective way for the synthesis of (V-doped LiFePO4)/C composites. The Rietveld refinement confirms that vanadium incorporation into olivine structure was accompanied by the formation of iron phosphide conducting phase. The coulombic capacity and rate capability of (V-doped LiFePO4)/C composite, in both organic and aqueous electrolyte solutions, were significantly improved relative to an undoped sample, as revealed by both galvanostatic cycling and cyclic voltammetry. The average discharging capacities of ~5mol.%V-doped LiFePO4/C composite in an aqueous LiNO3 solution were 91, 73 and 35 mAh g-1 at 1, 10 and 100 C, respectively, with no perceivable capacity fade upon 100 charging/discharging cycles.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
T1  - The incorporation of vanadium into olivine LiFePO4/C: improvement of lithium intercalation from both organic and aqueous electrolyte
SP  - 101
EP  - 101
ER  - 
@conference{
author = "Vujković, Milica and Jugović, Dragana and Mitrić, Miodrag and Stojković Simatović, Ivana and Cvjetićanin, Nikola and Mentus, Slavko",
year = "2013",
url = "http://dais.sanu.ac.rs/123456789/407",
abstract = "The simple and fast (malonic acid+glycine)-assisted gel-combustion process, followed by a heat treatment at 750oC under reductive atmosphere, is found to be a very effective way for the synthesis of (V-doped LiFePO4)/C composites. The Rietveld refinement confirms that vanadium incorporation into olivine structure was accompanied by the formation of iron phosphide conducting phase. The coulombic capacity and rate capability of (V-doped LiFePO4)/C composite, in both organic and aqueous electrolyte solutions, were significantly improved relative to an undoped sample, as revealed by both galvanostatic cycling and cyclic voltammetry. The average discharging capacities of ~5mol.%V-doped LiFePO4/C composite in an aqueous LiNO3 solution were 91, 73 and 35 mAh g-1 at 1, 10 and 100 C, respectively, with no perceivable capacity fade upon 100 charging/discharging cycles.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts",
title = "The incorporation of vanadium into olivine LiFePO4/C: improvement of lithium intercalation from both organic and aqueous electrolyte",
pages = "101-101"
}

The LiFe(1-x)VxPO4/C Composite Synthesized by Gel-Combustion Method, with Improved Rate Capability and Cycle Life in Aerated Aqueous Solutions

Vujković, Milica; Jugović, Dragana; Mitrić, Miodrag; Stojković, Ivana; Cvjetićanin, Nikola; Mentus, Slavko

(Elsevier, 2013)

TY  - JOUR
AU  - Vujković, Milica
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Stojković, Ivana
AU  - Cvjetićanin, Nikola
AU  - Mentus, Slavko
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/384
AB  - The nitrate-(glycine + malonic acid)-assisted gel-combustion process, followed by a heat treatment at 750 °C under reductive atmosphere, was used as a fast and effective way to synthesize vanadium doped olivine incorporated in carbon matrix, of general formula LiFe(1−x)VxPO4/C. The two-phased Rietveld refinement confirmed that vanadium incorporation into olivine structure was complete. The heating under reduction atmosphere caused the formation of iron phosphide to some extent, the concentration was determined by Rietveld analysis. The capacity and rate capability of these composites were tested by both cyclic voltammetry and galvanostatic cycling. Specifically, the average discharging capacities of the composite with x = 0.055, determined in an saturated aqueous LiNO3 solution equilibrated with air, at the rates of 1, 10 and 100 C, amounted to 91, 73 and 35 mAh g−1, respectively, with no perceivable capacity fade.
PB  - Elsevier
T2  - Electrochimica Acta
T1  - The LiFe(1-x)VxPO4/C Composite Synthesized by Gel-Combustion Method, with Improved Rate Capability and Cycle Life in Aerated Aqueous Solutions
SP  - 835
EP  - 842
VL  - 109
DO  - 10.1016/j.electacta.2013.07.219
ER  - 
@article{
author = "Vujković, Milica and Jugović, Dragana and Mitrić, Miodrag and Stojković, Ivana and Cvjetićanin, Nikola and Mentus, Slavko",
year = "2013",
url = "http://dais.sanu.ac.rs/123456789/384",
abstract = "The nitrate-(glycine + malonic acid)-assisted gel-combustion process, followed by a heat treatment at 750 °C under reductive atmosphere, was used as a fast and effective way to synthesize vanadium doped olivine incorporated in carbon matrix, of general formula LiFe(1−x)VxPO4/C. The two-phased Rietveld refinement confirmed that vanadium incorporation into olivine structure was complete. The heating under reduction atmosphere caused the formation of iron phosphide to some extent, the concentration was determined by Rietveld analysis. The capacity and rate capability of these composites were tested by both cyclic voltammetry and galvanostatic cycling. Specifically, the average discharging capacities of the composite with x = 0.055, determined in an saturated aqueous LiNO3 solution equilibrated with air, at the rates of 1, 10 and 100 C, amounted to 91, 73 and 35 mAh g−1, respectively, with no perceivable capacity fade.",
publisher = "Elsevier",
journal = "Electrochimica Acta",
title = "The LiFe(1-x)VxPO4/C Composite Synthesized by Gel-Combustion Method, with Improved Rate Capability and Cycle Life in Aerated Aqueous Solutions",
pages = "835-842",
volume = "109",
doi = "10.1016/j.electacta.2013.07.219"
}
19
23
22

Electrochemical Behaviour of V2O5 Xerogel and V2O5 Xerogel/C Composite in an Aqueous LiNO3 and Mg(NO3)(2) Solutions

Stojković, Ivana; Cvjetićanin, Nikola; Marković, Smilja; Mitrić, Miodrag; Mentus, Slavko

(2010)

TY  - JOUR
AU  - Stojković, Ivana
AU  - Cvjetićanin, Nikola
AU  - Marković, Smilja
AU  - Mitrić, Miodrag
AU  - Mentus, Slavko
PY  - 2010
UR  - http://dais.sanu.ac.rs/123456789/3353
AB  - We synthesized both the V2O5 xerogel and the composite V2O5 xerogel/C starting from the solution of V2O5 in hydrogen peroxide. After the characterization by XRD, thermal (TCA-DTA), SEM methods and by particle size analysis, the investigation of Li+ and Mg2+ intercalation/deintercalation reactions in an aqueous solutions of LiNO3 and Mg(NO3)(2) were performed by cyclic voltammetry. The composite material V2O5 xerogel/C displayed relatively high intercalation capacity, amounting to 123 mA h g(-1) and 107 mA h g(-1), in lithium and magnesium salt solutions, respectively.
T2  - Acta Physica Polonica A
T1  - Electrochemical Behaviour of V2O5 Xerogel and V2O5 Xerogel/C Composite in an Aqueous LiNO3 and Mg(NO3)(2) Solutions
SP  - 837
EP  - 840
VL  - 117
IS  - 5
DO  - 10.12693/APhysPolA.117.837
ER  - 
@article{
author = "Stojković, Ivana and Cvjetićanin, Nikola and Marković, Smilja and Mitrić, Miodrag and Mentus, Slavko",
year = "2010",
url = "http://dais.sanu.ac.rs/123456789/3353",
abstract = "We synthesized both the V2O5 xerogel and the composite V2O5 xerogel/C starting from the solution of V2O5 in hydrogen peroxide. After the characterization by XRD, thermal (TCA-DTA), SEM methods and by particle size analysis, the investigation of Li+ and Mg2+ intercalation/deintercalation reactions in an aqueous solutions of LiNO3 and Mg(NO3)(2) were performed by cyclic voltammetry. The composite material V2O5 xerogel/C displayed relatively high intercalation capacity, amounting to 123 mA h g(-1) and 107 mA h g(-1), in lithium and magnesium salt solutions, respectively.",
journal = "Acta Physica Polonica A",
title = "Electrochemical Behaviour of V2O5 Xerogel and V2O5 Xerogel/C Composite in an Aqueous LiNO3 and Mg(NO3)(2) Solutions",
pages = "837-840",
volume = "117",
number = "5",
doi = "10.12693/APhysPolA.117.837"
}
20
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