Electro-oxidation mechanism of glyoxal on a gold electrode in acidic media

The electro-oxidation mechanism of glyoxal on a polycrystalline gold electrode in acidic solution has been studied. The oxidation takes place in the potential range at which OH and oxide coverages are formed and proceeds via a sequence of chemical and electro-chemical steps with the formation of oxa...

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Bibliographic Details
Published in:Journal of power sources 1989-10, Vol.27 (4), p.273-286
Main Author: González-Velasco, J.
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Study of interfaces
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Summary:The electro-oxidation mechanism of glyoxal on a polycrystalline gold electrode in acidic solution has been studied. The oxidation takes place in the potential range at which OH and oxide coverages are formed and proceeds via a sequence of chemical and electro-chemical steps with the formation of oxalic acid and finally CO 2 and water. The kinetic parameters measured allow the formulation of a mechanism in which the formation of OH coverage and glyoxal adsorption are followed by a rate determining step in which OH and glyoxal molecules react with each other. At higher pH values the oxide coverage starts to interfere, giving rise to a modification in the reaction path.
ISSN:0378-7753
1873-2755
DOI:10.1016/0378-7753(89)80042-4