Abstract
The variations of the zero-charge potential, specific surface charge, and free interface energy in the Ag−Au|F−(H2O) system are studied with the use of impedance measurements in a wide range of alloy compositions. In terms of the concept of a finitely thick interface layer, a theoretical isotherm of the surface composition of the alloy, i.e., the concentration dependence of the activity coefficients of the components is plotted. It is shown that, in Ag−Au alloys at 298 K, gold is surface active, apparently, due to its higher hydrophilicity. The exchange current of the overall reaction of hydrogen evolution on Ag−Au alloys from aqueous sulfuric-acid solutions depends nonlinearily on the surface concentration of gold.
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