Abstract
The electrochemical reduction of in molten eutectic is shifted to more positive potentials by the addition of or . In the case of added three electrons are consumed per mole of and an insoluble reduction product having the empirical formula is obtained. In the presence of , the reaction product depends on the electrolytic conditions, especially the cathodic potential. The limiting processes appear to be a two‐electron process, favored by low cathodic potential and high cobalt (II) concentration to yield , and a three electron process, favored by high cathodic potential and low cobalt (II) concentration to yield . A mechanism consistent with these observations is proposed.
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