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Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry
dc.creator | Rajić, Vladimir | |
dc.creator | Stojković Simatović, Ivana | |
dc.creator | Veselinović, Ljiljana | |
dc.creator | Belošević Čavor, Jelena | |
dc.creator | Novaković, Mirjana | |
dc.creator | Popović, Maja | |
dc.creator | Škapin, Srečo Davor | |
dc.creator | Mojović, Miloš | |
dc.creator | Stojadinović, Stevan | |
dc.creator | Rac, Vladislav | |
dc.creator | Janković Častvan, Ivona | |
dc.creator | Marković, Smilja | |
dc.date.accessioned | 2020-11-25T13:56:09Z | |
dc.date.available | 2021-09-07 | |
dc.date.issued | 2020 | |
dc.identifier.isbn | 1463-9084 | |
dc.identifier.uri | https://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp03377d | |
dc.identifier.uri | https://dais.sanu.ac.rs/123456789/9544 | |
dc.description.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. | en |
dc.language | en | |
dc.publisher | Royal Society of Chemistry | |
dc.relation | info:eu-repo/grantAgreement/MESTD/inst-2020/200175/RS// | |
dc.relation | info:eu-repo/grantAgreement/MESTD/inst-2020/200017/RS// | |
dc.relation | 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 | |
dc.relation.isversionof | https://doi.org/10.1039/D0CP03377D | |
dc.relation.isversionof | https://hdl.handle.net/21.15107/rcub_dais_9543 | |
dc.rights | embargoedAccess | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc/4.0/ | |
dc.source | Physical Chemistry Chemical Physics | |
dc.title | Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry | en |
dc.type | article | en |
dc.rights.license | BY-NC | |
dcterms.abstract | Белошевић 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.spage | 22078 | |
dc.citation.epage | 22095 | |
dc.citation.volume | 22 | |
dc.citation.issue | 38 | |
dc.identifier.wos | 000576194400046 | |
dc.identifier.doi | 10.1039/D0CP03377D | |
dc.identifier.scopus | 2-s2.0-85092681262 | |
dc.description.other | This 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.description.other | Published version: [https://hdl.handle.net/21.15107/rcub_dais_9543] | |
dc.type.version | acceptedVersion | |
dc.identifier.fulltext | https://dais.sanu.ac.rs/bitstream/id/39845/10.1039@D0CP03377D.pdf | |
dc.identifier.rcub | https://hdl.handle.net/21.15107/rcub_dais_9544 |