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A series of perovskite‐type manganites, (Ln = lanthanoids or Y), were examined for their electrode‐catalytic activities to reduce oxygen in alkaline solution. Polarization experiments using gas diffusion‐type electrodes revealed that the catalytic activity differed significantly with a change in Ln, being in the order of . This order coincides with the decreasing order of the ionic radius of .
Hyodo et al. (Fri,) studied this question.