Current doubling mechanism of the photoanodic reaction of sodium formate at the ZnO electrode is re-examined. Quantitative analysis of the reaction products revealed that ZnO electrode corroded during the current doubling reaction, which has not been previously reported. However, zinc ions were formed with about 50% of current efficiency. Carbon dioxide, instead of oxygen, was formed during the reaction. These experimental observations strongly suggested mechanism proposed by earlier workers were incorrect. A new mechanism is proposed.
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Fujishima et al. (1981) studied this question.
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