Téléchargement | - Voir le manuscrit accepté : Electrocatalytic activity of non-stoichiometric perovskites toward oxygen reduction reaction in alkaline electrolytes (PDF, 2.0 Mio)
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DOI | Trouver le DOI : https://doi.org/10.1149/1.3655433 |
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Auteur | Rechercher : Yuan, Xiao-Zi1; Rechercher : Li, Xiaoxia1; Rechercher : Qu, Wei1; Rechercher : Ivey, Douglas G.; Rechercher : Wang, Haijiang1 |
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Affiliation | - Conseil national de recherches du Canada. Institut d'innovation en piles à combustible du CNRC
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Commanditaire | Rechercher : ECS Battery Division |
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Format | Texte, Article |
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Conférence | 219th Electrochemical Society (ECS) Meeting, May 1-6, 2011, Montreal, Quebec, Canada |
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Sujet | Perovskite LaxCa0.4MnO3; sol-gel method; X-ray diffraction; gas adsorption technique (BET); transmission electron microscopy (TEM); oxygen reduction reaction (ORR) |
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Résumé | Perovskite LaxCa0.4MnO3 (x = 0.4, 0.5, 0.6) powder was prepared through a sol-gel method and characterized by X-ray diffraction (XRD), a gas adsorption technique (BET) and transmission electron microscopy (TEM). The electrocatalytic properties of LaxCa0.4MnO3/C composites towards the oxygen reduction reaction (ORR) were studied using rotating ring-disk electrode (RRDE) techniques and Koutecky-Levich theory in both 1 M and 6M KOH electrolytes. The results show better ORR activities for non-stoichiometric perovskites than that for stoichiometric La0.6Ca0.4MnO3. The overall electron transfer numbers for these LaxCa0.4MnO3 composites are in the range of 3.2-3.7, and with decreasing values of x the electron transfer number increases and accordingly H2O2 production decreases. These results suggest that the existence of a Mn reduction/oxidation pair in Ca-doped nonstoichiometric perovskites could activate the ORR reaction sites, resulting in improved catalytic activity. |
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Date de publication | 2011 |
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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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Numéro NPARC | 19542559 |
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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 | 4b829105-b537-4326-a288-9ef00537639f |
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Enregistrement créé | 2012-02-23 |
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Enregistrement modifié | 2020-04-21 |
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