Summary
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.
Zusammenfassung
Die kathodische Reduktion von Cu(II)-Ionen an Gold in Wasser-Pyridin-Mischungen mit NaClO4 als Grundelektrolyt wird mittels Voltammetrie an der rotierenden Scheiben- und Ring-Scheibenelektrode sowie mittels Coulometrie und Potentiometrie untersucht. Die erhaltenen Stromspannunskurven verteilen sich auf zwei Stufen, die den konsekutiven Durchtrittsreaktionen Cu(II) + e− → Cu(I) und Cu(I) + e− → Cu entsprechen. Die Diffusionskoeffizienten der Cu(II)-Ionen sowie die Formal-Standardpotentiale und die kinetischen Parameter der Cu(II)/Cu(I)-Durchtrittsreaktion wurden bestimmt und werden diskutiert. Zusätzliche Experimente zur Erklärung der Adsorption von Pyridin an polykristallinem Gold wurden mit Hilfe einer elektrochemischen Quarz-Mikrowaage durchgeführt.
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Scendo, M., Malyszko, J. Mechanism and kinetics of the electrochemical reduction of Cu(II) at gold in pyridine and water-pyridine mixtures. Monatsh Chem 128, 123–135 (1997). https://doi.org/10.1007/BF00807301
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DOI: https://doi.org/10.1007/BF00807301