Abstract
We examined the electrocatalytic effect caused by Pb and Bi ad-atoms on HCOOH oxidation on a Pt electrode by three typical methods presently used. Pb ad-atoms give a higher peak for formic acid oxidation in both cyclic voltammograms and the curves obtained by the potential step method, carried out in a solution containing formic acid and a salt of the ad-atom species, than Bi ad-atoms do. These results agree with those reported by Adžić and Pletcher. Bi ad-atoms give a greater enhancement effect on platinum having pre-adsorbed ad-atoms in a solution containing only formic acid than Pb ad-atoms do. The competition between ad-atoms and poisoning intermediates for surface sites is found to be a serious problem in obtaining a well-defined relation between the catalytic activity of ad-atoms and the coverage with ad-atoms in the kinetic measurement in a solution containing both formic acid and the salt of the ad-atom species. Our conclusion is that Bi ad-atoms have a greater catalytic effect than Pb ad-atoms.
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