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Preparation and characterization of carbon-based fuel-cell electrodes with platinum-group bimetallic catalysts

Authors
Journal
Journal of Electroanalytical Chemistry
0022-0728
Publisher
Elsevier
Publication Date
Volume
223
Identifiers
DOI: 10.1016/0022-0728(87)85253-1
Disciplines
  • Chemistry

Abstract

Abstract Electrochemical activities for hydrogen oxidation on porous carbon electrodes with platinum-group bimetallic catalysts viz., Pt+Ru, Pt + Pd and Pd+Ru, in acid and alkali electrolytes, have been measured as a function of composition. Of these, carbon electrodes containing 4 wt.% Pt+6 wt.% Ru exhibit the maximum activity which is also higher than that for the individual metal catalysts. This catalyst is also active for the indirect oxidation of ammonia as well as the reduction of oxygen. X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS)_and electron spin resonance (ESR) studies reveal that the presence of Ru suppresses the formation of the oxides of platinum. X-ray and electron diffraction studies show that, unlike Pt on carbon, the catalyst particles of Pt+Ru on carbon are amorphous.

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