Mechanism of the electrooxidation of ethyl alcohol and acetaldehyde on a smooth platinum electrode: I. Contribution of the chemical and electrochemical reactions to the overall anodic process

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Summary

A comparative investigation of the effect of the potential on the current density and the coverage of a smooth Pt electrode with surface oxide in sulphuric acid and sulphuric acid solutions of ethyl alcohol and acetaldehyde was carried out using the potential sweep and impulse techniques. It is concluded that the currents in the double-layer region are attributed to electrooxidation of the products of destructive chemisorption and to electrooxidation of the organic substance on the bare electrode surface. The latter process and the electrooxidation of the electrode surface itself determine the currents in the oxygen potential range. The chemical interaction between the organic substance and the surface oxide can play a considerable part. The relative participation of the single processes mentioned above in their dependence on the potential and the surface coverage in the overall electrode reaction is discussed. No essential difference in the mechanism of electrooxidation of ethyl alcohol and acetaldehyde is found.

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