The adsorption and oxidation of CO on porous Pt‐electrodes was studied with Differential Electrochemical Mass Spectroscopy (DEMS). The following results were obtained: 1. When CO is removed from the solution after adsorption has taken place, the adsorbed species mainly occupies two Pt‐sites. It is oxidized within two peaks at 0.52 and 0.73 V giving CO 2 thereby consuming 2 electrons. No evidence of “reduced CO” was found independent of the adsorption potential. 2. When CO is present in the solution, a physisorbed species reversibly bound to one Pt‐site covers about 60% of the electrode surface. It is oxidatively desorbed at 0.85 V.
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Wolter et al. (1984) studied this question.
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