Abstract
On the basis of simultaneous measurements of the electric current and the hydrogen evolution rate, the reactions at Ni electrodes in alkaline borohydride solutions are successfully decomposed into two component reactions, i.e., borohydride oxidation and hydrogen electrode reaction. The former is a 4-electron anodic reaction with molecular hydrogen as a product, while the latter is either hydrogen evolution or hydrogen oxidation, depending on the borohydride concentration and electrode potential. Because of the change of the relative contributions of these two reactions, the apparent number of electrons in borohydride oxidation changes from 0 to 5 under the discharge conditions studied, much smaller than the theoretical electron number 8 for full oxidation of borohydride. The current decomposition result is able to interpret quantitatively the experimental linear relationship of open circuit potential to logarithmic borohydride concentration. The current decomposition also reveals a novel phenomenon, i.e.,...
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