Electrocatalytic activity of non-stoichiometric perovskites toward oxygen reduction reaction in alkaline electrolytes

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DOIResolve DOI: http://doi.org/10.1149/1.3655433
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Proceedings titleECS Transactions
Conference219th Electrochemical Society (ECS) Meeting, May 1-6, 2011, Montreal, Quebec, Canada
Pages1120; # of pages: 10
SubjectPerovskite LaxCa0.4MnO3; sol-gel method; X-ray diffraction; gas adsorption technique (BET); transmission electron microscopy (TEM); oxygen reduction reaction (ORR)
AbstractPerovskite 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.
Publication date
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number19542559
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Record identifier4b829105-b537-4326-a288-9ef00537639f
Record created2012-02-23
Record modified2016-05-09
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