| Alternative title | Nanoparticles of Fe2O3 and Co3O4 as efficient electrocatalysts for oxygen reduction reaction in acid medium |
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| Download | - View final version: Nanoparticles of Fe₂O₃ and Co₃O₄ as efficient electrocatalysts for oxygen reduction reaction in acid medium (PDF, 3.5 MiB)
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| DOI | Resolve DOI: https://doi.org/10.21577/0103-5053.20190195 |
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| Author | Search for: Alves, Ismael; Search for: Santos, José; Search for: Viégas, Deracilde; Search for: Marques, Edmar; Search for: Lacerda, Cristina; Search for: Zhang, Lei1ORCID identifier: https://orcid.org/0000-0002-1823-2948; Search for: Zhang, Jiujun1; Search for: Marques, Aldaléa |
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| Affiliation | - National Research Council of Canada. Energy, Mining and Environment
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| Format | Text, Article |
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| Subject | electrocatalysis; metallic nanoparticles; iron oxide; cobalt oxide; oxygen reduction |
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| Abstract | This paper presents a comparative study about the oxygen reduction reaction (ORR) catalyzed by nanoparticles of Fe₂O₃ and Co₃O₄ applied on the surface of glassy carbon electrodes(GCE). The nanoparticles were synthesized using the modified polymeric precursor method (Pechini). These two nanomaterials were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The estimated average particle sizes were 21 and 31 nm for Fe₂O₃ and Co₃O₄, respectively. Electrochemical impedance spectroscopy (EIS) showed that Fe₂O₃/GCE has lower charge transfer resistance than Co₃O₄/GCE. The surface electrochemistry of both Fe₂O₃/GCE and Co₃O₄/GCE was studied in the solution free of O₂, and their corresponding reaction mechanisms were analyzed. The electrocatalytic ORR activities of these two catalysts were studied by cyclic voltammetry (CV) and rotating disk electrode (RDE) in acidic solution. The results obtained by RDE indicated that both Fe₂O₃/GCE and Co₃O₄/GCE can catalyze the ORR with a dominating 2-electron transfer process to produce H₂O₂, using a potential of −0.8 V. These kinetic results indicate that Fe₂O₃/GCE is more efficient than Co₃O₄/GCE in terms of ORR. Considering the low cost of these two non-noble metal catalysts, they may be used as viable alternatives for ORR electrocatalysts. |
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| Publication date | 2019 |
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| Publisher | Brazilian Chemical Society |
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| Licence | |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 547798b3-d72f-45a2-be14-35c191d91d55 |
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| Record created | 2020-11-26 |
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| Record modified | 2021-08-13 |
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