Correlations between hydrogen electrosorption properties and composition of Pd-noble metal alloys

Hydrogen adsorption on and absorption into I'd alloys with other noble metals was studied in acidic solutions (0.5 M H2SO4) using cyclic voltammetry. Correlations were found between the potentials of adsorbed/absorbed hydrogen oxidation peaks and surface/bulk compositions of Pd-Rh alloys. The potential of the alpha-beta-phase transition depends linearly on Pd bulk content in Pd-Au, Pd-Rh, Pd-Pt and Pd-Pt-Rh alloys. The obtained relationships can be utilized for the determination of the composition of homogeneous Pd-noble alloys from hydrogen electrosorption experiments. (c) 2006 Elsevier B.V. All rights reserved.