| Autre titre | Nanoparticles of Fe2O3 and Co3O4 as efficient electrocatalysts for oxygen reduction reaction in acid medium |
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| Téléchargement | - Voir la version finale : Nanoparticles of Fe₂O₃ and Co₃O₄ as efficient electrocatalysts for oxygen reduction reaction in acid medium (PDF, 3.5 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.21577/0103-5053.20190195 |
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| Auteur | Rechercher : Alves, Ismael; Rechercher : Santos, José; Rechercher : Viégas, Deracilde; Rechercher : Marques, Edmar; Rechercher : Lacerda, Cristina; Rechercher : Zhang, Lei1Identifiant ORCID : https://orcid.org/0000-0002-1823-2948; Rechercher : Zhang, Jiujun1; Rechercher : Marques, Aldaléa |
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| Affiliation | - Conseil national de recherches du Canada. Énergie, les mines et l'environnement
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| Format | Texte, Article |
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| Sujet | electrocatalysis; metallic nanoparticles; iron oxide; cobalt oxide; oxygen reduction |
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| Résumé | 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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| Date de publication | 2019 |
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| Maison d’édition | Brazilian Chemical Society |
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| Licence | |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 547798b3-d72f-45a2-be14-35c191d91d55 |
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| Enregistrement créé | 2020-11-26 |
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| Enregistrement modifié | 2021-08-13 |
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