Abstract
Abstract The intercalation and electrooxidation of glyoxylic acid in 0.1 M KOH solutions in a highly oriented pyrolytic graphite electrode (HOPGE) have been studied. The values of Tafel slopes, reaction orders and apparent activation enthalpy determined resulted in an experimental rate equation as follows: I = nFK C Glyox exp 0.44 FE RT . A five step mechanism can be given to explain the expression, where a first intercalation step is followed by a single electron transfer from the inserted glyoxylate ions towards the host graphite layers. At the end, CO2, CO and water are obtained as reaction products which give rise to localized strains with the result of a sudden exfoliation of the electrode.
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