Abstract
The cathodic reduction of Cu(II) ions at a gold electrode has been studied in waterpyridine mixtures containing NaClO4 as background electrolyte by means of rotating disc (RDE) and ring-disc electrode voltammetry (RRDE), coulometry, and potentiometry. The voltammetric curves obtained at the RDE split into two waves of nearly the same height which correspond to two successive reactions: Cu(II) + e− → Cu(I) and Cu(I) + e− → Cu. The diffusion coefficients of Cu(II) as well as the formal potentials and kinetic parameters of the Cu(II)/Cu(I) electrode reaction were evaluated and are discussed. In addition, some experiments with an electrochemical quartz crystal microbalance (EQCM) were performed in order to explain the pyridine adsorption on polycrystalline gold.
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