Abstract
Methanol electro-oxidation on electrodes of amorphous Pt-Zr alloys doped with tin or ruthenium was studied in 0.5 M H 2SO 4 by means of potentiostatic polarization and the results were correlated with surface characteristics determined by surface area measurements, scanning electron microscopy observations and X-ray photoelectron spectroscopy (XPS) analyses. The electrocatalytic activity was considerably enchanced by brief treatment with aqueous HF, which yielded a porous surface layer on the alloy electrodes. The layer was effectively in a higher state of dispersion than ordinary platinum black. The XPS analyses indicated that Raney-type porous platinum layers are formed in the surface region, and that a suitable concentration of tin or ruthenium dopant is essential in realizing a high electrocatalytic activity.
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