Abstract
Anodic characteristics of the substituted oxides, SrFe 0.9M 0.1O 3(M: Ni, Co, Ti, Mn), were studied. It was found that the catalytic activities of the oxides substituted with Ni and Co ions for the oxygen evolution reaction are high in alkaline solution. The reaction mechanisms for the oxygen evolution reaction are proposed for all the substituted oxides under the assumption of Langmuirian adsorption condition. The current efficiencies of the anodic dissolution of the oxides were much higher in acidic solution than those in alkaline solution. The anodic dissolution is much suppressed by the substitution with Ni or Co ion in alkaline solution. Therefore, the oxides substituted with Ni and Co ions are most suitable as anode materials in alkaline solution. The anodic dissolution is based on the oxygen vacancy formed in the oxygen evolution process. The mechanism of the anodic dissolution of the oxides is proposed.
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