Show simple item record

dc.creatorRajić, Vladimir
dc.creatorStojković Simatović, Ivana
dc.creatorVeselinović, Ljiljana
dc.creatorBelošević Čavor, Jelena
dc.creatorNovaković, Mirjana
dc.creatorPopović, Maja
dc.creatorŠkapin, Srečo Davor
dc.creatorMojović, Miloš
dc.creatorStojadinović, Stevan
dc.creatorRac, Vladislav
dc.creatorJanković Častvan, Ivona
dc.creatorMarković, Smilja
dc.date.accessioned2020-11-25T13:56:09Z
dc.date.available2021-09-07
dc.date.issued2020
dc.identifier.isbn1463-9084
dc.identifier.urihttps://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp03377d
dc.identifier.urihttps://dais.sanu.ac.rs/123456789/9544
dc.description.abstractEco-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.en
dc.languageen
dc.publisherRoyal Society of Chemistry
dc.relationinfo:eu-repo/grantAgreement/MESTD/inst-2020/200175/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/inst-2020/200017/RS//
dc.relationBilateral 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
dc.rightsembargoedAccess
dc.sourcePhysical Chemistry Chemical Physics
dc.titleBifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometryen
dc.typearticleen
dc.rights.licenseBY-NC
dcterms.abstractБелошевић Чавор, Јелена; Стојковић Симатовић, Ивана; Поповић, Маја; Веселиновић, Љиљана; Новаковић, Мирјана; Марковић, Смиља; Рајић, Владимир; Јанковић Частван, Ивона; Рац, Владислав; Стојадиновић, Стеван; Мојовић, Милош; Шкапин, Сречо Давор;
dc.citation.spage22078
dc.citation.epage22095
dc.citation.volume22
dc.citation.issue38
dc.identifier.wos000576194400046
dc.identifier.doi10.1039/D0CP03377D
dc.identifier.scopus2-s2.0-85092681262
dc.description.otherThis is the peer-reviewed version of the article: Rajić, V., Simatović, I.S., Veselinović, L., Čavor, J.B., Novaković, M., Popović, M., Škapin, S.D., Mojović, M., Stojadinović, S., Rac, V., Častvan, I.J., Marković, S., 2020. Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry. Phys. Chem. Chem. Phys. 22, 22078–22095. [https://doi.org/10.1039/D0CP03377D]
dc.type.versionacceptedVersion


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record