Abstract
The effect of infinitesimal quantities of thallium ions on the gold electrodeposition from alkali–cyanide solutions is studied in conditions of a controlled time of the electrode contact with solution using the technique of renewal of the electrode surface by cutting off a thin slice of the metal. As opposed to the behavior of pure alkali–cyanide solutions, where a polarization dependence represented in the Tafel coordinates experiences an inflection, in the presence of infinitesimal quantities of thallium nitrate, no inflection is present in the curves recorded on a freshly-renewed electrode and a considerable depolarization of the process is observed. Effective values of the exchange current and the transfer coefficient increase, respectively, from values of 3 × 10–5 A cm–2 and 0.23 in pure alkali–cyanide solutions to 10–4 A cm–2 and 0.5 in the presence of thallium nitrate. It is shown that, if the potential scan is preceded by an exposure of the electrode in solution, with an increase in its duration, the depolarization effect passes through a maximum. A probable explanation for the regularities observed is suggested.
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Bek, R.Y. Kinetics of Gold Electrodeposition from Alkali–Cyanide Solutions: The Effect of Infinitesimal Quantities of Thallium(I) Nitrate. Russian Journal of Electrochemistry 38, 1237–1243 (2002). https://doi.org/10.1023/A:1021162129127
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DOI: https://doi.org/10.1023/A:1021162129127