Electrochemical Behavior of Pt-Au Alloys

Abstract

The electrochemical behavior of the Pt - Au alloys in the whole composition range has been studied by cyclic voltammetry. The alloys were prepared by electrochemical deposition and the bulk compositions were determined byEDAX analysis. The surface areas of the electrodes were calculated from charges needed for oxidation of hydrogen adsorbed on platinum and reduction of gold or platinum oxide monolayer. These data were used for the estimation of the surface composition. The results were compared with data obtained from double layer capacity measurements. The surface area and platinum concentration on the surface, calculated from charges needed for platinum and gold oxides reduction, are overestimated, because the charge needed for platinum oxide reduction corresponds to more than a one monolayer.