Abstract
The electrooxidation of carbon monoxide previously adsorbed at a given potential and during various adsorption times was carried out on the three low index planes of platinum single crystals. The I( E) profiles obtained display at least two oxidation peaks which can be attributed to the oxidation of different adsorbed CO species. Comparison with the results at the solid—gas interface and calculation of the quantity of electricity involved for each peak suggest that these two kinds of adsorbed CO may be linearly bonded CO and bridge or multibonded CO. A third CO species might occur on the Pt (110) surface. These results allow the I( E) profile for a polycrystalline electrode closely covered by adsorbed CO to be simulated as the weighted contribution of the oxidation current of linearly bonded CO on each single crystal plane.
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