Abstract
There is a question as to why the enhancement effects of non-oxygen-adsorbing ad-atoms which enhance formic acid oxidation on a Pt electrode are not observed in methanol oxidation. To solve this question, we elucidated the catalytic effects of non-oxygen-adsorbing ad-atoms (Ag, Hg, Bi and Se) on each elementary step in methanol oxidation. The rates of each of the elementary steps in methanol oxidation were determined during the transient state on Pt electrodes having non-oxygen-adsorbing ad-atoms. It is established that non-oxygen-adsorbing ad-atoms inhibit the first elementary step (from methanol to formaldehyde), which is a dehydration process and a precursor to the third elementary step (from formic acid to carbon dioxide). As a result, the enhancement effect of these ad-atoms is not observed in methanol oxidation, although these ad-atoms enhanced the third elementary step in methanol oxidation.
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