Anodic characteristics of (with ) electrodes were investigated in alkaline solutions. It was found that the catalytic activities for the oxygen evolution reaction are relatively high and that the activity of the electrode with is higher than that of . The secondary chemical step, i.e., , is rate‐controlling in the oxygen evolution reaction. Therefore, it is concluded that the rate of the secondary chemical step is more rapid at the electrode with the higher value of because of the beneficial effect of the higher positive charge on the Co cation on this step. electrodes are suitable for the anode material in alkaline solutions, because anodic dissolution scarcely occurs.
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Matsumoto et al. (1980) studied this question.
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