Abstract
The cathodic decomposition of AgI was studied using a single pulse galvanostatic technique. The working electrode was an AgI-rotating disc immersed in the molten KNO 3-NaNO 3 eutectic. Linear overpotential-log (current density) plots were obtained for varying concentrations of I −. Evidence was found for the existence of two different control steps, depending on the iodide concentration. At lower I − concentrations a chemical reaction forming an adsorbed AgI − 2 complex ion is postulated as the rate-determining step. At higher I − concentrations the rds is related to the electrochemical reaction AgI + e = Ag° + I −. An alternative charge transfer process is suggested corresponding to the transfer of an I − ion between the two ionic media.
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