Abstract
Sn, Ge, As, Sb and Ru ad-atoms were experimentally verified to adsorb oxygen or oxygen-containing species. It was found that methanol oxidation is enhanced by Sn and Ru ad-atoms but not by Ge, As and Sb ad-atoms. The purpose of this work is to elucidate why oxygen donation is possible for Ru and Sn ad-atoms but not for Ge, As and Sb ad-atoms. The rates of each of the elementary steps in methanol oxidation were determined, during the transient state on Pt electrodes having oxygen-adsorbing ad-atoms, and on a Pt electrode. The reason why As and Sb ad-atoms, which adsorb oxygen in a potential region far more negative than Pt, cannot donate their oxygen atoms for the oxidation of methanol is that these ad-atoms inhibit the first step, which is the dehydration process and is the precursor to the second step, which involves oxygen acceptance.
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