Abstract
The electrocatalytic oxidation of glyoxal in perchloric acid on smooth and modified platinum electrodes was investigated by quantitative analysis of the electrolysis products using gas and liquid chromatography. A mechanistic study confirmed that glyoxal adsorption is a dissociative process leading mainly to CO 2 (60%) and formic acid (40%). Modification of the electrode surface by lead adatoms allowed glyoxal oxidation to be carried out at different controlled potentials. On the other hand, glyoxal consumption was shown to be a first-order reaction. It was concluded that the most important parameters controlling the selectivity of glyoxal oxidation are the electrode potential and the nature of the foreign metal adatoms.
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