TY  - CONF
AU  - Mravik, Željko
AU  - Pejčić, Milica
AU  - Rmuš Mravik, Jelena
AU  - Belec, Blaž
AU  - Bajuk-Bogdanović, Danica
AU  - Jovanović, Sonja
AU  - Marković, Smilja
AU  - Gavrilov, Nemanja
AU  - Skuratov, Vladimir
AU  - Jovanović, Zoran
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/15761
AB  - In recent years graphene oxide (GO)/12-tungstophosphoric acid (WPA) nanocomposites have demonstrated promising potential for electrochemical supercapacitors. However, to enhance their performance, it is necessary to modify the surface chemistry of GO to minimize the influence of basal plane oxygen groups, which hinder the material's conductivity. Additionally, some degree of structural modification of WPA is desired. In this regard, ion beam irradiation presents a promising method to simultaneously optimize surface chemistry of GO and structurally modify WPA. To accomplish this, ion beam irradiation is employed for modification of individual components as well as their nanocomposites with varying mass ratios. Different ion species, fluences and energies were utilized depending on the sample type, ranging from 10 keV C to 710 MeV Bi. Spectroscopy methods were employed to gain insight into the type and degree of structural modification in WPA. A direct correlation is observed between the parameters of the ion beams and the resulting structural changes. As the disordering increases, the structure transitions from partially modified to increased bond breaking, ultimately leading to reconnected bronze-like structures. By increasing the fluence, a gradual modification of the structure and surface chemistry of GO was possible. The effects of irradiation on GO and WPA are particularly pronounced in irradiated composites, where higher capacitance is measured.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023
T1  - Graphene oxide/12 tungstophosphoric acid nanocomposites – achieving favorable properties with ion beams for electrochemical supercapacitors
SP  - 50
EP  - 50
UR  - https://hdl.handle.net/21.15107/rcub_dais_15761
ER  - 

@conference{
author = "Mravik, Željko and Pejčić, Milica and Rmuš Mravik, Jelena and Belec, Blaž and Bajuk-Bogdanović, Danica and Jovanović, Sonja and Marković, Smilja and Gavrilov, Nemanja and Skuratov, Vladimir and Jovanović, Zoran",
year = "2023",
abstract = "In recent years graphene oxide (GO)/12-tungstophosphoric acid (WPA) nanocomposites have demonstrated promising potential for electrochemical supercapacitors. However, to enhance their performance, it is necessary to modify the surface chemistry of GO to minimize the influence of basal plane oxygen groups, which hinder the material's conductivity. Additionally, some degree of structural modification of WPA is desired. In this regard, ion beam irradiation presents a promising method to simultaneously optimize surface chemistry of GO and structurally modify WPA. To accomplish this, ion beam irradiation is employed for modification of individual components as well as their nanocomposites with varying mass ratios. Different ion species, fluences and energies were utilized depending on the sample type, ranging from 10 keV C to 710 MeV Bi. Spectroscopy methods were employed to gain insight into the type and degree of structural modification in WPA. A direct correlation is observed between the parameters of the ion beams and the resulting structural changes. As the disordering increases, the structure transitions from partially modified to increased bond breaking, ultimately leading to reconnected bronze-like structures. By increasing the fluence, a gradual modification of the structure and surface chemistry of GO was possible. The effects of irradiation on GO and WPA are particularly pronounced in irradiated composites, where higher capacitance is measured.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023",
title = "Graphene oxide/12 tungstophosphoric acid nanocomposites – achieving favorable properties with ion beams for electrochemical supercapacitors",
pages = "50-50",
url = "https://hdl.handle.net/21.15107/rcub_dais_15761"
}

Mravik, Ž., Pejčić, M., Rmuš Mravik, J., Belec, B., Bajuk-Bogdanović, D., Jovanović, S., Marković, S., Gavrilov, N., Skuratov, V.,& Jovanović, Z.. (2023). Graphene oxide/12 tungstophosphoric acid nanocomposites – achieving favorable properties with ion beams for electrochemical supercapacitors. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023
Belgrade : Serbian Ceramic Society., 50-50.
https://hdl.handle.net/21.15107/rcub_dais_15761

Mravik Ž, Pejčić M, Rmuš Mravik J, Belec B, Bajuk-Bogdanović D, Jovanović S, Marković S, Gavrilov N, Skuratov V, Jovanović Z. Graphene oxide/12 tungstophosphoric acid nanocomposites – achieving favorable properties with ion beams for electrochemical supercapacitors. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023. 2023;:50-50.
https://hdl.handle.net/21.15107/rcub_dais_15761 .

Mravik, Željko, Pejčić, Milica, Rmuš Mravik, Jelena, Belec, Blaž, Bajuk-Bogdanović, Danica, Jovanović, Sonja, Marković, Smilja, Gavrilov, Nemanja, Skuratov, Vladimir, Jovanović, Zoran, "Graphene oxide/12 tungstophosphoric acid nanocomposites – achieving favorable properties with ion beams for electrochemical supercapacitors" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023 (2023):50-50,
https://hdl.handle.net/21.15107/rcub_dais_15761 .

TY  - CONF
AU  - Mravik, Željko
AU  - Pejčić, Milica
AU  - Rmuš Mravik, Jelena
AU  - Belec, Blaž
AU  - Bajuk-Bogdanović, Danica
AU  - Jovanović, Sonja
AU  - Marković, Smilja
AU  - Gavrilov, Nemanja
AU  - Skuratov, Vladimir
AU  - Jovanović, Zoran
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14871
AB  - Ion beam modification of materials is notable method for achieving their unique structural, electronic, and other physicochemical properties. In the case of graphene oxide (GO) such modification of structure and surface chemistry is known to yield properties interesting for electrochemical supercapacitors. The performance of GO supercapacitors can be additionally improved by incorporating components with attractive redox properties. In this work, the influence of ion beam irradiation on synergy of GO and 12-tungstophosphoric acid (WPA) in their nanocomposite was investigated. For that, both components and their composites with different mass ratios were irradiated using different ion species, fluences and energies (from 10 keV C to 710 MeV Bi). For the irradiated WPA, results showed clear correlation between ion beam parameters, degree of structural modification and electrochemical properties. With increasing structural modification, bond breaking is first induced giving higher catalytic activity toward HER. Further irradiation resulted in an increased interconnection of polytungstate species producing lower catalytic activity and lower lithiation capacity. Irradiated GO showed modified surface chemistry, with preferable reduction of alkoxy and epoxy groups, changes in morphology and electric properties due to increased number of defects with increasing fluence, synergic effect of ion beam irradiated GO and WPA resulted in higher capacitance of irradiated composites compared to GO presumably because of interaction of structurally modified WPA with defect sites on GO thus reducing electrolyte flow along ion tracks.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023
T1  - Ion-beam irradiated graphene oxide, 12-tungstophosphoric acid and their nanocomposites for electrochemical supercapacitors
SP  - 36
EP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_dais_14871
ER  - 

@conference{
author = "Mravik, Željko and Pejčić, Milica and Rmuš Mravik, Jelena and Belec, Blaž and Bajuk-Bogdanović, Danica and Jovanović, Sonja and Marković, Smilja and Gavrilov, Nemanja and Skuratov, Vladimir and Jovanović, Zoran",
year = "2023",
abstract = "Ion beam modification of materials is notable method for achieving their unique structural, electronic, and other physicochemical properties. In the case of graphene oxide (GO) such modification of structure and surface chemistry is known to yield properties interesting for electrochemical supercapacitors. The performance of GO supercapacitors can be additionally improved by incorporating components with attractive redox properties. In this work, the influence of ion beam irradiation on synergy of GO and 12-tungstophosphoric acid (WPA) in their nanocomposite was investigated. For that, both components and their composites with different mass ratios were irradiated using different ion species, fluences and energies (from 10 keV C to 710 MeV Bi). For the irradiated WPA, results showed clear correlation between ion beam parameters, degree of structural modification and electrochemical properties. With increasing structural modification, bond breaking is first induced giving higher catalytic activity toward HER. Further irradiation resulted in an increased interconnection of polytungstate species producing lower catalytic activity and lower lithiation capacity. Irradiated GO showed modified surface chemistry, with preferable reduction of alkoxy and epoxy groups, changes in morphology and electric properties due to increased number of defects with increasing fluence, synergic effect of ion beam irradiated GO and WPA resulted in higher capacitance of irradiated composites compared to GO presumably because of interaction of structurally modified WPA with defect sites on GO thus reducing electrolyte flow along ion tracks.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023",
title = "Ion-beam irradiated graphene oxide, 12-tungstophosphoric acid and their nanocomposites for electrochemical supercapacitors",
pages = "36-36",
url = "https://hdl.handle.net/21.15107/rcub_dais_14871"
}

Mravik, Ž., Pejčić, M., Rmuš Mravik, J., Belec, B., Bajuk-Bogdanović, D., Jovanović, S., Marković, S., Gavrilov, N., Skuratov, V.,& Jovanović, Z.. (2023). Ion-beam irradiated graphene oxide, 12-tungstophosphoric acid and their nanocomposites for electrochemical supercapacitors. in Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023
Belgrade : Materials Research Society of Serbia., 36-36.
https://hdl.handle.net/21.15107/rcub_dais_14871

Mravik Ž, Pejčić M, Rmuš Mravik J, Belec B, Bajuk-Bogdanović D, Jovanović S, Marković S, Gavrilov N, Skuratov V, Jovanović Z. Ion-beam irradiated graphene oxide, 12-tungstophosphoric acid and their nanocomposites for electrochemical supercapacitors. in Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023. 2023;:36-36.
https://hdl.handle.net/21.15107/rcub_dais_14871 .

Mravik, Željko, Pejčić, Milica, Rmuš Mravik, Jelena, Belec, Blaž, Bajuk-Bogdanović, Danica, Jovanović, Sonja, Marković, Smilja, Gavrilov, Nemanja, Skuratov, Vladimir, Jovanović, Zoran, "Ion-beam irradiated graphene oxide, 12-tungstophosphoric acid and their nanocomposites for electrochemical supercapacitors" in Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023 (2023):36-36,
https://hdl.handle.net/21.15107/rcub_dais_14871 .

TY  - CONF
AU  - Jovanović, Zoran
AU  - Mravik, Željko
AU  - Pejčić, Milica
AU  - Jovanović, Sonja
AU  - Vujković, Milica
AU  - Marković, Smilja
AU  - Bajuk-Bogdanović, Danica
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13592
AB  - Gaining a momentum from newly emerging properties of nanomaterials the further enhancement and integration of various functionalities have been made possible. Also, it became apparent that interaction between nano-objects can provide additional synergy capable of yielding new or significantly improved properties. This particularly applies to the surfaces and interfaces of nanomaterials where the intimate contact between components amplifies possible contributions of interfacial interactions. Since this aspect of interaction-property relation in many nanocomposites is still insufficiently explored, it is of interest to identify to what extent the properties emerge as a result of interaction-based synergy. To address these aspects, we have investigated a nano-composite of graphene oxide (GO) and 12-tungstophosporic acid (WPA) – a combination of materials that are known for the rich “portfolio” of properties. We will present results that contribute to better the understanding of interactions between nano-objects. The results are showing how simple temperature treatment and weight ratio of components is influencing the evolution of surface, structural properties and charge storage properties – all closely connected to interactions between components. Finally, the implications on synthetic approaches and fine-tuning of the functionality of GO/WPA nanocomposites will be discussed from the perspective of the obtained results.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022
T1  - On the contribution of surface chemistry, structure and interactions in GO/WPA nanocomposites for the electrochemical charge storage applications
SP  - 61
EP  - 61
UR  - https://hdl.handle.net/21.15107/rcub_dais_13592
ER  - 

@conference{
author = "Jovanović, Zoran and Mravik, Željko and Pejčić, Milica and Jovanović, Sonja and Vujković, Milica and Marković, Smilja and Bajuk-Bogdanović, Danica",
year = "2022",
abstract = "Gaining a momentum from newly emerging properties of nanomaterials the further enhancement and integration of various functionalities have been made possible. Also, it became apparent that interaction between nano-objects can provide additional synergy capable of yielding new or significantly improved properties. This particularly applies to the surfaces and interfaces of nanomaterials where the intimate contact between components amplifies possible contributions of interfacial interactions. Since this aspect of interaction-property relation in many nanocomposites is still insufficiently explored, it is of interest to identify to what extent the properties emerge as a result of interaction-based synergy. To address these aspects, we have investigated a nano-composite of graphene oxide (GO) and 12-tungstophosporic acid (WPA) – a combination of materials that are known for the rich “portfolio” of properties. We will present results that contribute to better the understanding of interactions between nano-objects. The results are showing how simple temperature treatment and weight ratio of components is influencing the evolution of surface, structural properties and charge storage properties – all closely connected to interactions between components. Finally, the implications on synthetic approaches and fine-tuning of the functionality of GO/WPA nanocomposites will be discussed from the perspective of the obtained results.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022",
title = "On the contribution of surface chemistry, structure and interactions in GO/WPA nanocomposites for the electrochemical charge storage applications",
pages = "61-61",
url = "https://hdl.handle.net/21.15107/rcub_dais_13592"
}

Jovanović, Z., Mravik, Ž., Pejčić, M., Jovanović, S., Vujković, M., Marković, S.,& Bajuk-Bogdanović, D.. (2022). On the contribution of surface chemistry, structure and interactions in GO/WPA nanocomposites for the electrochemical charge storage applications. in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022
Belgrade : Materials Research Society of Serbia., 61-61.
https://hdl.handle.net/21.15107/rcub_dais_13592

Jovanović Z, Mravik Ž, Pejčić M, Jovanović S, Vujković M, Marković S, Bajuk-Bogdanović D. On the contribution of surface chemistry, structure and interactions in GO/WPA nanocomposites for the electrochemical charge storage applications. in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022. 2022;:61-61.
https://hdl.handle.net/21.15107/rcub_dais_13592 .

Jovanović, Zoran, Mravik, Željko, Pejčić, Milica, Jovanović, Sonja, Vujković, Milica, Marković, Smilja, Bajuk-Bogdanović, Danica, "On the contribution of surface chemistry, structure and interactions in GO/WPA nanocomposites for the electrochemical charge storage applications" in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022 (2022):61-61,
https://hdl.handle.net/21.15107/rcub_dais_13592 .

TY  - CONF
AU  - Jovanović, Zoran
AU  - Bajuk-Bogdanović, Danica
AU  - Vujković, Milica
AU  - Mravik, Željko
AU  - Jovanović, Sonja
AU  - Marković, Smilja
AU  - Pejčić, Milica
AU  - Holclajtner Antunović, Ivanka
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13644
AB  - Gaining a momentum from newly emerging properties of nanomaterials the further enhancement and integration of various functionalities have been made possible. Also, it became apparent that interaction between nano-objects can provide additional synergy capable of yielding new or significantly improved properties. This particularly applies to the surfaces and interfaces of nanomaterials where the intimate contact between components amplifies possible contributions of interfacial interactions. Since this aspect of interaction-property relation in many nanocomposites is still insufficiently explored, it is of interest to identify to what extent the properties emerge as a result of interaction-based synergy or a co-action of individual components. To address these aspects, we have investigated a nanocomposite of graphene oxide (GO) and 12-tungstophosporic acid (WPA) – a combination of materials that are known for the rich “portfolio” of properties. In the talk the novel findings will be presented that contribute to better the understanding of interactions between nano-objects and how they contribute to novel properties. The results are showing how simple temperature treatment and weight ratio of components is influencing the evolution of surface, structural properties and charge storage properties – all closely connected to interactions between components. Finally, the implications on synthetic approaches and fine-tuning of the functionality of GO/WPA nanocomposites will be discussed from the perspective of the obtained results.
PB  - Belgrade : University of Belgrade, Faculty of Physical Chemistry
C3  - Contemporary batteries and supercapacitors : COIN2022 : program and book of abstracts / International Symposium Belgrade, June 1-2, 2022
T1  - The Role of Surface Chemistry, Structure and Interactions in the Electrochemical Charge Storage Properties of Graphene Oxide and 12-tungstophoshoric Acid Nanocomposites
SP  - 16
EP  - 16
UR  - https://hdl.handle.net/21.15107/rcub_dais_13644
ER  - 

@conference{
author = "Jovanović, Zoran and Bajuk-Bogdanović, Danica and Vujković, Milica and Mravik, Željko and Jovanović, Sonja and Marković, Smilja and Pejčić, Milica and Holclajtner Antunović, Ivanka",
year = "2022",
abstract = "Gaining a momentum from newly emerging properties of nanomaterials the further enhancement and integration of various functionalities have been made possible. Also, it became apparent that interaction between nano-objects can provide additional synergy capable of yielding new or significantly improved properties. This particularly applies to the surfaces and interfaces of nanomaterials where the intimate contact between components amplifies possible contributions of interfacial interactions. Since this aspect of interaction-property relation in many nanocomposites is still insufficiently explored, it is of interest to identify to what extent the properties emerge as a result of interaction-based synergy or a co-action of individual components. To address these aspects, we have investigated a nanocomposite of graphene oxide (GO) and 12-tungstophosporic acid (WPA) – a combination of materials that are known for the rich “portfolio” of properties. In the talk the novel findings will be presented that contribute to better the understanding of interactions between nano-objects and how they contribute to novel properties. The results are showing how simple temperature treatment and weight ratio of components is influencing the evolution of surface, structural properties and charge storage properties – all closely connected to interactions between components. Finally, the implications on synthetic approaches and fine-tuning of the functionality of GO/WPA nanocomposites will be discussed from the perspective of the obtained results.",
publisher = "Belgrade : University of Belgrade, Faculty of Physical Chemistry",
journal = "Contemporary batteries and supercapacitors : COIN2022 : program and book of abstracts / International Symposium Belgrade, June 1-2, 2022",
title = "The Role of Surface Chemistry, Structure and Interactions in the Electrochemical Charge Storage Properties of Graphene Oxide and 12-tungstophoshoric Acid Nanocomposites",
pages = "16-16",
url = "https://hdl.handle.net/21.15107/rcub_dais_13644"
}

Jovanović, Z., Bajuk-Bogdanović, D., Vujković, M., Mravik, Ž., Jovanović, S., Marković, S., Pejčić, M.,& Holclajtner Antunović, I.. (2022). The Role of Surface Chemistry, Structure and Interactions in the Electrochemical Charge Storage Properties of Graphene Oxide and 12-tungstophoshoric Acid Nanocomposites. in Contemporary batteries and supercapacitors : COIN2022 : program and book of abstracts / International Symposium Belgrade, June 1-2, 2022
Belgrade : University of Belgrade, Faculty of Physical Chemistry., 16-16.
https://hdl.handle.net/21.15107/rcub_dais_13644

Jovanović Z, Bajuk-Bogdanović D, Vujković M, Mravik Ž, Jovanović S, Marković S, Pejčić M, Holclajtner Antunović I. The Role of Surface Chemistry, Structure and Interactions in the Electrochemical Charge Storage Properties of Graphene Oxide and 12-tungstophoshoric Acid Nanocomposites. in Contemporary batteries and supercapacitors : COIN2022 : program and book of abstracts / International Symposium Belgrade, June 1-2, 2022. 2022;:16-16.
https://hdl.handle.net/21.15107/rcub_dais_13644 .

Jovanović, Zoran, Bajuk-Bogdanović, Danica, Vujković, Milica, Mravik, Željko, Jovanović, Sonja, Marković, Smilja, Pejčić, Milica, Holclajtner Antunović, Ivanka, "The Role of Surface Chemistry, Structure and Interactions in the Electrochemical Charge Storage Properties of Graphene Oxide and 12-tungstophoshoric Acid Nanocomposites" in Contemporary batteries and supercapacitors : COIN2022 : program and book of abstracts / International Symposium Belgrade, June 1-2, 2022 (2022):16-16,
https://hdl.handle.net/21.15107/rcub_dais_13644 .

TY  - JOUR
AU  - Milanović, Igor
AU  - Milošević-Govedarović, Sanja
AU  - Lukić, Miodrag
AU  - Jovanović, Zoran
AU  - Rmuš, Jelena
AU  - Mitrović-Rajić, Anđela
AU  - Grbović-Novaković, Jasmina
AU  - Kurko, Sandra V.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13492
AB  - LiAlH4 was modified by mechanical milling and with the addition of 5 wt.% Fe2O3 in order to improve its hydrogen desorption properties. The composite was milled for 1, 3, 5, 7 or 15min, and depending on the milling time, various phenomena took place. Up to a milling time of 5min, the particle size of the composite decreases. Further milling leads to the particles agglomeration reaching the size of the starting material after 15min. Moreover, the mechanical milling process leads to the transformation of AlH - 4 to AlH 3 - 6 structure as a result of partial hydrogen desorption. Hydrogen desorption during the milling is the most pronounced in the sample milled for 15min, so this sample has only one hydrogen desorption peak in the temperature-programmed desorption measurements.Mechanical milling with the addition of Fe2O3 for up to 15min improves LiAlH4 hydrogen desorption properties as hydrogen desorption temperature and apparent activation energies decrease.
T2  - Processing and Application of Ceramics
T1  - Study of milling time impact on hydrogen desorption from LiAlH4-Fe2O3 composites
SP  - 259
EP  - 266
VL  - 16
IS  - 3
DO  - 10.2298/PAC2203259M
UR  - https://hdl.handle.net/21.15107/rcub_dais_13492
ER  - 

@article{
author = "Milanović, Igor and Milošević-Govedarović, Sanja and Lukić, Miodrag and Jovanović, Zoran and Rmuš, Jelena and Mitrović-Rajić, Anđela and Grbović-Novaković, Jasmina and Kurko, Sandra V.",
year = "2022",
abstract = "LiAlH4 was modified by mechanical milling and with the addition of 5 wt.% Fe2O3 in order to improve its hydrogen desorption properties. The composite was milled for 1, 3, 5, 7 or 15min, and depending on the milling time, various phenomena took place. Up to a milling time of 5min, the particle size of the composite decreases. Further milling leads to the particles agglomeration reaching the size of the starting material after 15min. Moreover, the mechanical milling process leads to the transformation of AlH - 4 to AlH 3 - 6 structure as a result of partial hydrogen desorption. Hydrogen desorption during the milling is the most pronounced in the sample milled for 15min, so this sample has only one hydrogen desorption peak in the temperature-programmed desorption measurements.Mechanical milling with the addition of Fe2O3 for up to 15min improves LiAlH4 hydrogen desorption properties as hydrogen desorption temperature and apparent activation energies decrease.",
journal = "Processing and Application of Ceramics",
title = "Study of milling time impact on hydrogen desorption from LiAlH4-Fe2O3 composites",
pages = "259-266",
volume = "16",
number = "3",
doi = "10.2298/PAC2203259M",
url = "https://hdl.handle.net/21.15107/rcub_dais_13492"
}

Milanović, I., Milošević-Govedarović, S., Lukić, M., Jovanović, Z., Rmuš, J., Mitrović-Rajić, A., Grbović-Novaković, J.,& Kurko, S. V.. (2022). Study of milling time impact on hydrogen desorption from LiAlH4-Fe2O3 composites. in Processing and Application of Ceramics, 16(3), 259-266.
https://doi.org/10.2298/PAC2203259M
https://hdl.handle.net/21.15107/rcub_dais_13492

Milanović I, Milošević-Govedarović S, Lukić M, Jovanović Z, Rmuš J, Mitrović-Rajić A, Grbović-Novaković J, Kurko SV. Study of milling time impact on hydrogen desorption from LiAlH4-Fe2O3 composites. in Processing and Application of Ceramics. 2022;16(3):259-266.
doi:10.2298/PAC2203259M
https://hdl.handle.net/21.15107/rcub_dais_13492 .

Milanović, Igor, Milošević-Govedarović, Sanja, Lukić, Miodrag, Jovanović, Zoran, Rmuš, Jelena, Mitrović-Rajić, Anđela, Grbović-Novaković, Jasmina, Kurko, Sandra V., "Study of milling time impact on hydrogen desorption from LiAlH4-Fe2O3 composites" in Processing and Application of Ceramics, 16, no. 3 (2022):259-266,
https://doi.org/10.2298/PAC2203259M .,
https://hdl.handle.net/21.15107/rcub_dais_13492 .

TY  - JOUR
AU  - Jovanović, Zoran
AU  - Mravik, Željko
AU  - Bajuk Bogdanović, Danica
AU  - Jovanović, Sonja
AU  - Marković, Smilja
AU  - Vujković, Milica
AU  - Kovač, Janez
AU  - Vengust, Damjan
AU  - Uskoković-Marković, Snežana
AU  - Holclajtner Antunović, Ivanka
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/6882
AB  - In the present study we investigated the interaction between 12-tungstophosphoric acid (WPA) and graphene oxide (GO) in their nanocomposite by utilizing the loading of WPA as an intrinsic parameter for interaction tuning. The Fourier-transform infrared spectroscopy, temperature-programmed desorption, X-ray photoelectron spectroscopy, zeta-potential measurements, thermogravimetric analysis, X-ray diffraction, Raman spectroscopy and transmission electron microscopy methods revealed that ∼5–13 wt% of WPA represents critical loading that separates two distinct contributions to GO-WPA interaction. This was explained by the self-limiting nature of GO-WPA interaction, initially controlled by high dispersion of WPA on GO (up to 13 wt%), that is eventually overpowered by WPA-WPA interaction as loading increases. As a result, the WPA agglomerates are being formed because of which the hybrid character of the nanocomposite diminishes, i.e., the properties of independent components start to be manifested to greater extent. The obtained results provide an important framework for considering possible outcomes in other 2D-0D systems, whose interaction is relevant both from fundamental and applicative point of view. Thus, the GO/WPA nanocomposite illustrates how the interactions between the components can be used for tuning the properties of nanocomposite as a whole.
T2  - Carbon
T1  - Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite
SP  - 166
EP  - 178
VL  - 156
DO  - 10.1016/j.carbon.2019.09.072
UR  - https://hdl.handle.net/21.15107/rcub_dais_6882
ER  - 

@article{
author = "Jovanović, Zoran and Mravik, Željko and Bajuk Bogdanović, Danica and Jovanović, Sonja and Marković, Smilja and Vujković, Milica and Kovač, Janez and Vengust, Damjan and Uskoković-Marković, Snežana and Holclajtner Antunović, Ivanka",
year = "2020",
abstract = "In the present study we investigated the interaction between 12-tungstophosphoric acid (WPA) and graphene oxide (GO) in their nanocomposite by utilizing the loading of WPA as an intrinsic parameter for interaction tuning. The Fourier-transform infrared spectroscopy, temperature-programmed desorption, X-ray photoelectron spectroscopy, zeta-potential measurements, thermogravimetric analysis, X-ray diffraction, Raman spectroscopy and transmission electron microscopy methods revealed that ∼5–13 wt% of WPA represents critical loading that separates two distinct contributions to GO-WPA interaction. This was explained by the self-limiting nature of GO-WPA interaction, initially controlled by high dispersion of WPA on GO (up to 13 wt%), that is eventually overpowered by WPA-WPA interaction as loading increases. As a result, the WPA agglomerates are being formed because of which the hybrid character of the nanocomposite diminishes, i.e., the properties of independent components start to be manifested to greater extent. The obtained results provide an important framework for considering possible outcomes in other 2D-0D systems, whose interaction is relevant both from fundamental and applicative point of view. Thus, the GO/WPA nanocomposite illustrates how the interactions between the components can be used for tuning the properties of nanocomposite as a whole.",
journal = "Carbon",
title = "Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite",
pages = "166-178",
volume = "156",
doi = "10.1016/j.carbon.2019.09.072",
url = "https://hdl.handle.net/21.15107/rcub_dais_6882"
}

Jovanović, Z., Mravik, Ž., Bajuk Bogdanović, D., Jovanović, S., Marković, S., Vujković, M., Kovač, J., Vengust, D., Uskoković-Marković, S.,& Holclajtner Antunović, I.. (2020). Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite. in Carbon, 156, 166-178.
https://doi.org/10.1016/j.carbon.2019.09.072
https://hdl.handle.net/21.15107/rcub_dais_6882

Jovanović Z, Mravik Ž, Bajuk Bogdanović D, Jovanović S, Marković S, Vujković M, Kovač J, Vengust D, Uskoković-Marković S, Holclajtner Antunović I. Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite. in Carbon. 2020;156:166-178.
doi:10.1016/j.carbon.2019.09.072
https://hdl.handle.net/21.15107/rcub_dais_6882 .

Jovanović, Zoran, Mravik, Željko, Bajuk Bogdanović, Danica, Jovanović, Sonja, Marković, Smilja, Vujković, Milica, Kovač, Janez, Vengust, Damjan, Uskoković-Marković, Snežana, Holclajtner Antunović, Ivanka, "Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite" in Carbon, 156 (2020):166-178,
https://doi.org/10.1016/j.carbon.2019.09.072 .,
https://hdl.handle.net/21.15107/rcub_dais_6882 .

TY  - CONF
AU  - Mravik, Željko
AU  - Bajuk-Bogdanović, Danica
AU  - Vujković, Milica
AU  - Marković, Smilja
AU  - Kovač, Janez
AU  - Jovanović, Sonja
AU  - Holclajtner Antunović, Ivanka
AU  - Jovanović, Zoran
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/14865
AB  - Graphene oxide (GO) has shown great potential for applications in charge storage devices. Its two dimensional structure, high specific surface area as well as hydrophilicity and pseudocapacity are making it an exceptional candidate for electrochemical supercapacitors. Recent studies have shown that charge storage properties of GO can be significantly improved in nanocomposites with different inorganic materials. Therefore, in the present work we have combined GO and 12-tungstophosphoric acid (WPA) into a nanocomposite that exerts high synergic activity of the components.
Graphene oxide was synthesized via modified Hummers method and characterized by Temperature programmed desorption method (TPD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectrometry (XPS) in order to establish its initial surface chemistry, while thermal reduction was used for altering the composition of surface oxygen groups. Cyclic voltammetry (CV) was used to access the contribution of individual surface oxygen groups on the capacitance of graphene oxide. Analysis of initial and thermally reduced GO revealed that desorption of low-temperature groups and their conversion to phenolic and carbonyl groups is the reason for almost doubled capacitance at 500 °C.
Next, we studied the interactions between GO and WPA by altering their mass ratio in the nanocomposite. The FTIR analysis have revealed that WPA interacts with GO via terminal oxygen of a tungstate octahedron. Furthermore, these interactions are the most pronounced at 10-20 wt.% of WPA in the nanocomposite.
PB  - Belgrade : Faculty of physical chemistry
C3  - Book of Abstracts / 3rd International Meeting on materials science for energy related applications, september 25-26, 2018, Belgrade
T1  - Synergic activity of graphene oxide and 12-tungstophosphoric acid in their nanocomposite for supercapacitor applications
SP  - 23
EP  - 23
UR  - https://hdl.handle.net/21.15107/rcub_dais_14865
ER  - 

@conference{
author = "Mravik, Željko and Bajuk-Bogdanović, Danica and Vujković, Milica and Marković, Smilja and Kovač, Janez and Jovanović, Sonja and Holclajtner Antunović, Ivanka and Jovanović, Zoran",
year = "2018",
abstract = "Graphene oxide (GO) has shown great potential for applications in charge storage devices. Its two dimensional structure, high specific surface area as well as hydrophilicity and pseudocapacity are making it an exceptional candidate for electrochemical supercapacitors. Recent studies have shown that charge storage properties of GO can be significantly improved in nanocomposites with different inorganic materials. Therefore, in the present work we have combined GO and 12-tungstophosphoric acid (WPA) into a nanocomposite that exerts high synergic activity of the components.
Graphene oxide was synthesized via modified Hummers method and characterized by Temperature programmed desorption method (TPD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectrometry (XPS) in order to establish its initial surface chemistry, while thermal reduction was used for altering the composition of surface oxygen groups. Cyclic voltammetry (CV) was used to access the contribution of individual surface oxygen groups on the capacitance of graphene oxide. Analysis of initial and thermally reduced GO revealed that desorption of low-temperature groups and their conversion to phenolic and carbonyl groups is the reason for almost doubled capacitance at 500 °C.
Next, we studied the interactions between GO and WPA by altering their mass ratio in the nanocomposite. The FTIR analysis have revealed that WPA interacts with GO via terminal oxygen of a tungstate octahedron. Furthermore, these interactions are the most pronounced at 10-20 wt.% of WPA in the nanocomposite.",
publisher = "Belgrade : Faculty of physical chemistry",
journal = "Book of Abstracts / 3rd International Meeting on materials science for energy related applications, september 25-26, 2018, Belgrade",
title = "Synergic activity of graphene oxide and 12-tungstophosphoric acid in their nanocomposite for supercapacitor applications",
pages = "23-23",
url = "https://hdl.handle.net/21.15107/rcub_dais_14865"
}

Mravik, Ž., Bajuk-Bogdanović, D., Vujković, M., Marković, S., Kovač, J., Jovanović, S., Holclajtner Antunović, I.,& Jovanović, Z.. (2018). Synergic activity of graphene oxide and 12-tungstophosphoric acid in their nanocomposite for supercapacitor applications. in Book of Abstracts / 3rd International Meeting on materials science for energy related applications, september 25-26, 2018, Belgrade
Belgrade : Faculty of physical chemistry., 23-23.
https://hdl.handle.net/21.15107/rcub_dais_14865

Mravik Ž, Bajuk-Bogdanović D, Vujković M, Marković S, Kovač J, Jovanović S, Holclajtner Antunović I, Jovanović Z. Synergic activity of graphene oxide and 12-tungstophosphoric acid in their nanocomposite for supercapacitor applications. in Book of Abstracts / 3rd International Meeting on materials science for energy related applications, september 25-26, 2018, Belgrade. 2018;:23-23.
https://hdl.handle.net/21.15107/rcub_dais_14865 .

Mravik, Željko, Bajuk-Bogdanović, Danica, Vujković, Milica, Marković, Smilja, Kovač, Janez, Jovanović, Sonja, Holclajtner Antunović, Ivanka, Jovanović, Zoran, "Synergic activity of graphene oxide and 12-tungstophosphoric acid in their nanocomposite for supercapacitor applications" in Book of Abstracts / 3rd International Meeting on materials science for energy related applications, september 25-26, 2018, Belgrade (2018):23-23,
https://hdl.handle.net/21.15107/rcub_dais_14865 .

TY  - CONF
AU  - Mravik, Željko
AU  - Bajuk Bogdanović, Danica
AU  - Marković, Smilja
AU  - Kovač, Janez
AU  - Holclajtner Antunović, Ivanka
AU  - Jovanović, Zoran
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/3666
AB  - The rich surface chemistry and large surface area of graphene oxide (GO) provide a platform for various functional materials that synergistically enhance charge storage properties of the composite. In present work we have investigated interaction between GO and 12- thungstophosphoric acid (WPA) in their nanocomposites as a function of different mass ratio of constituents. For this purpose, the Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometry (XPS), temperature programmed desorption method (TPD) and thermogravimetric/differential thermal analysis (TGA-DTA) methods were used. FTIR spectra have shown shifts and splitting of characteristic bands of WPA as a result of interactions with GO. Both XPS and TPD methods have shown an initial decrease of the total amount of surface oxygen groups of GO, with a minimum at around 10 wt.% of WPA, above which a restoration of the amount of surface oxygen groups was noticed. TGA-DTA analysis revealed an improved thermal stability of the material up to 25 wt.% of WPA; at higher loading of WPA the thermal properties of nanocomposite became alike to the ones of individual components. The obtained results suggest optimal conditions for preparation of GO-WPA nanocomposites for electrochemical charge storage applications.
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  - Study of the interaction between graphene oxide and 12-tungstophosphoric acid in their nanocomposite
SP  - 110
EP  - 110
UR  - https://hdl.handle.net/21.15107/rcub_dais_3666
ER  - 

@conference{
author = "Mravik, Željko and Bajuk Bogdanović, Danica and Marković, Smilja and Kovač, Janez and Holclajtner Antunović, Ivanka and Jovanović, Zoran",
year = "2018",
abstract = "The rich surface chemistry and large surface area of graphene oxide (GO) provide a platform for various functional materials that synergistically enhance charge storage properties of the composite. In present work we have investigated interaction between GO and 12- thungstophosphoric acid (WPA) in their nanocomposites as a function of different mass ratio of constituents. For this purpose, the Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometry (XPS), temperature programmed desorption method (TPD) and thermogravimetric/differential thermal analysis (TGA-DTA) methods were used. FTIR spectra have shown shifts and splitting of characteristic bands of WPA as a result of interactions with GO. Both XPS and TPD methods have shown an initial decrease of the total amount of surface oxygen groups of GO, with a minimum at around 10 wt.% of WPA, above which a restoration of the amount of surface oxygen groups was noticed. TGA-DTA analysis revealed an improved thermal stability of the material up to 25 wt.% of WPA; at higher loading of WPA the thermal properties of nanocomposite became alike to the ones of individual components. The obtained results suggest optimal conditions for preparation of GO-WPA nanocomposites for electrochemical charge storage applications.",
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 = "Study of the interaction between graphene oxide and 12-tungstophosphoric acid in their nanocomposite",
pages = "110-110",
url = "https://hdl.handle.net/21.15107/rcub_dais_3666"
}

Mravik, Ž., Bajuk Bogdanović, D., Marković, S., Kovač, J., Holclajtner Antunović, I.,& Jovanović, Z.. (2018). Study of the interaction between graphene oxide and 12-tungstophosphoric acid in their nanocomposite. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018
Belgrade : Materials Research Society of Serbia., 110-110.
https://hdl.handle.net/21.15107/rcub_dais_3666

Mravik Ž, Bajuk Bogdanović D, Marković S, Kovač J, Holclajtner Antunović I, Jovanović Z. Study of the interaction between graphene oxide and 12-tungstophosphoric acid in their nanocomposite. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018. 2018;:110-110.
https://hdl.handle.net/21.15107/rcub_dais_3666 .

Mravik, Željko, Bajuk Bogdanović, Danica, Marković, Smilja, Kovač, Janez, Holclajtner Antunović, Ivanka, Jovanović, Zoran, "Study of the interaction between graphene oxide and 12-tungstophosphoric acid in their nanocomposite" in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018 (2018):110-110,
https://hdl.handle.net/21.15107/rcub_dais_3666 .

TY  - CONF
AU  - Mravik, Željko
AU  - Bajuk Bogdanović, Danica
AU  - Marković, Smilja
AU  - Holclajtner Antunović, Ivanka
AU  - Jovanović, Zoran
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/15450
AB  - In recent years the nanocomposites of graphene oxide (GO) and different inorganic and organic compounds have shown great potential for charge storage applications. In present work we have investigated the influence of 12-tungstophosphoric acid (WPA) on surface chemistry of graphene oxide and thermal stability of nanocomposite. For this purpose nanocomposites with different mass ratios of GO and WPA were prepared. The thermal stability of nanocomposites was investigated by thermogravimetric and differential thermal analysis (TGA-DTA) while changes in surface chemistry of GO and structural properties of WPA were investigated by Fourier transform infrared spectroscopy (FTIR) and temperature programmed desorption (TPD) method. The TGA-DTA measurements of composites have shown that the major mass loss, due to carbon combustion, is shifted to higher temperatures (~500 °C vs. 380 °C of pure GO). Furthermore, when the amount of WPA is higher than 25 mass percent the nanocomposites start to act like individual components, which was also confirmed by FTIR analysis. The amount of surface oxygen groups, monitored by both TPD and FTIR methods, showed ˝V˝ shaped dependence from the quantity of WPA with minimum at about 12 mass percent of WPA. At the same time, the FTIR spectra revealed the structural changes of WPA, displayed as shifting and splitting of characteristic bands of Keggin anion structure.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia
T1  - Surface chemistry, thermal stability and structural properties of graphene oxide/12-tungstophosphoric acid nanocomposite
SP  - 48
EP  - 48
UR  - https://hdl.handle.net/21.15107/rcub_dais_15450
ER  - 

@conference{
author = "Mravik, Željko and Bajuk Bogdanović, Danica and Marković, Smilja and Holclajtner Antunović, Ivanka and Jovanović, Zoran",
year = "2017",
abstract = "In recent years the nanocomposites of graphene oxide (GO) and different inorganic and organic compounds have shown great potential for charge storage applications. In present work we have investigated the influence of 12-tungstophosphoric acid (WPA) on surface chemistry of graphene oxide and thermal stability of nanocomposite. For this purpose nanocomposites with different mass ratios of GO and WPA were prepared. The thermal stability of nanocomposites was investigated by thermogravimetric and differential thermal analysis (TGA-DTA) while changes in surface chemistry of GO and structural properties of WPA were investigated by Fourier transform infrared spectroscopy (FTIR) and temperature programmed desorption (TPD) method. The TGA-DTA measurements of composites have shown that the major mass loss, due to carbon combustion, is shifted to higher temperatures (~500 °C vs. 380 °C of pure GO). Furthermore, when the amount of WPA is higher than 25 mass percent the nanocomposites start to act like individual components, which was also confirmed by FTIR analysis. The amount of surface oxygen groups, monitored by both TPD and FTIR methods, showed ˝V˝ shaped dependence from the quantity of WPA with minimum at about 12 mass percent of WPA. At the same time, the FTIR spectra revealed the structural changes of WPA, displayed as shifting and splitting of characteristic bands of Keggin anion structure.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia",
title = "Surface chemistry, thermal stability and structural properties of graphene oxide/12-tungstophosphoric acid nanocomposite",
pages = "48-48",
url = "https://hdl.handle.net/21.15107/rcub_dais_15450"
}

Mravik, Ž., Bajuk Bogdanović, D., Marković, S., Holclajtner Antunović, I.,& Jovanović, Z.. (2017). Surface chemistry, thermal stability and structural properties of graphene oxide/12-tungstophosphoric acid nanocomposite. in Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 48-48.
https://hdl.handle.net/21.15107/rcub_dais_15450

Mravik Ž, Bajuk Bogdanović D, Marković S, Holclajtner Antunović I, Jovanović Z. Surface chemistry, thermal stability and structural properties of graphene oxide/12-tungstophosphoric acid nanocomposite. in Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia. 2017;:48-48.
https://hdl.handle.net/21.15107/rcub_dais_15450 .

Mravik, Željko, Bajuk Bogdanović, Danica, Marković, Smilja, Holclajtner Antunović, Ivanka, Jovanović, Zoran, "Surface chemistry, thermal stability and structural properties of graphene oxide/12-tungstophosphoric acid nanocomposite" in Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia (2017):48-48,
https://hdl.handle.net/21.15107/rcub_dais_15450 .