Abstract
The catalytic hydrogen prewave ( E 1/2 =−1.25 V vs. SCE) produced by cysteine in the presence of nickel ion as well as the catalytic nickel prewave ( E 1/2 =−0.6 V) were studied at pH<7. Polarographic and spectrophotometric data show that nickel complexes with cysteine are involved in the electrode reactions. The two electrode processes studied are closely related, since the zero-valent nickel complex formed during the catalytic nickel discharge acts as catalyst for hydrogen evolution. The reaction mechanism given explains the effects of basic parameters, taking into account the change of the surface concentration of reducible species involved in chemical equilibria, as a function of potential.
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