Abstract
The electrochemical impedance technique was use to obtain the potentials of the minimum capacitance of Cu, Ag, and Au electrodes in chlorides, bromides, and iodides of sodium, potassium, and cesium. Their dependence on the nature of the metal and electrolyte, temperature and ac signal frequency is studied. It is shown that the potential of the minimum capacitance tends at a decrease in the frequency to the zero charge potential measured under similar conditions. An assumption is ventured that the cause of this may be specific adsorption of halide ions on the electrode in the form of negatively charged dihalide complexes. It is found that in the systems where two minimums are observed, a decrease in the spacing between the cathodic and anodic minimums correlates with an increase in the strength of the metal-adsorbate bond.
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Original Russian Text © V.P. Stepanov, S.I. Dokashenko, E.V. Kirillova, 2012, published in Elektrokhimiya, 2012, Vol. 48, No. 10, pp. 1073–1078.
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Stepanov, V.P., Dokashenko, S.I. & Kirillova, E.V. Frequency dependence of potentials of minimum capacitance for electrodes of copper subgroup metals in alkali halide melts. Russ J Electrochem 48, 1005–1010 (2012). https://doi.org/10.1134/S1023193512100114
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DOI: https://doi.org/10.1134/S1023193512100114