Oxidation and Adsorption of CO at Pt-Au-SPE Electrodes

摘要

Pt-Au-SPE electrodes made hy the successive chemical deposition of Au and Pt on Nafion mem-branes were tested and compared with the single metal-SPE electrodes for surrace oxidation, Co adsorption and oxidation. Part of the surrace of the binary metal electrodes behaves difrerently from either Au or Pt sin-gle metal-SPE electrode for Coads oxidation, revealing surface modulation effects in the binary metal elec-trode. Rowever, these modulated surfaces have no appreciable contribution to the electrode activity for CO oxidation. The electrode activity for CO oxidation is mainly governed by the total Pt surface area of the bina-ry electrodes. The predeposited Au was found to be ravorable for higher dispersion of the successively de-posited Pt.