Highly Active Epitaxial La(1-x)Sr(x)MnO3 Surfaces for the Oxygen Reduction Reaction: Role of Charge Transfer.
作者： Kelsey A. Stoerzinger , Weiming Lü , Changjian Li , Ariando , T. Venkatesan
DOI: 10.1021/ACS.JPCLETT.5B00439
关键词: Kinetics 、 Inorganic chemistry 、 Oxide 、 Chemistry 、 Valence (chemistry) 、 Electrochemistry 、 Nanotechnology 、 Catalysis 、 Reaction mechanism 、 Redox 、 Electrocatalyst
摘要: Most studies of oxide catalysts for the oxygen reduction reaction (ORR) use powder, where heterogeneity exposed surfaces and composite nature electrodes limit fundamental understanding mechanism. We present ORR activity epitaxially oriented La(1–x)SrxMnO3 investigate, by varying Sr substitution, relationship between role charge transfer catalytic in an alkaline environment. The is greatest with 33% Sr, containing mixed Mn3+/4+, (110) (111) orientations display comparable activities to that (001). Electrochemical measurements using facile redox couple [Fe(CN)6]3–/4– illustrate increasing trends faster charge-transfer kinetics, indicating importance at oxide/water interface Mn valence promoting kinetics.
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