Abstract
IR spectroscopic observation has revealed that a bridge-type CO species is formed on Pd + Au alloy electrodes as well as on Pd upon chemisorption of methanol in alkaline solution. The CO species acts as a self-poisoning species for the electro-oxidation of CH 3OH. The nature of the CO species is similar to that adsorbed directly from a CO-saturated solution, namely, (i) a bridged, but not linear-type CO species is formed and (ii) its amount decreases with increasing Au content. The CO species is oxidized at lower potentials on electrodes of intermediate alloy composition (40–50 at.% Pd) than on Pd. The activity of those alloys towards the electro-oxidation of CH 3OH has a maximum in the same composition range. Possible schemes of formation of the bridge-type CO from CH 3OH are proposed.
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