Abstract
The formation of anodic oxide films on nickel surfaces in base was investigated using cyclic voltammetry. The formation and reduction of a Ni(II) species was observed at low potentials, about 0–0.3 V (RHE). Potential/pH studies indicated that the initial oxypecies formed in this region were anionic. The reduction of such a layer was shown to occur in a significantly different manner, evidently a postelectrochemical restructuring of the initially deposited species occurred via a field-assisted, place-exchange type reaction. Conversion of terminal O − to bridging (Ni−O−Ni) oxygen species at the surface evidently resulted in a changeover from an anionic to a neutral layer. The results are discussed by analogy with recent data for gold and platinum. A much thicker hydrous film was produced by repetitive potential cycling. The influence of sweep-rate, sweep-limits, solution temperature, and base concentration on the growth and charge storage behaviour of this type of layer was invegtigated.
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