Abstract
Effect of electrodeposition conditions on the nucleation of gold crystals at a glassy-carbon cathode in an NaCl–KCl–CsCl melt at 500–700°C is studied by a galvanostatic technique. The maximum nucleation overvoltage can reach 550 mV. At low current densities, the surface of glassy carbon undergoes activation due to spontaneous deposition of gold crystals. The overvoltage vs. time curve for a melt containing an elevated (as compared with equilibrium) amount of chlorine exhibits additional wave that precedes the nucleation peak. The wave is probably connected with the recharge of ions of Au(III) to Au(I). The oxide film disappears from the cathode surface, thus facilitating the nucleation process. On a modeling electrode with a current leakage, an increase in the maximum overvoltage is discovered, which is not connected with the cathode activation. Exchange currents for the discharge-ionization of gold at the growing nuclei are estimated.
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