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Abstract
Potential shifts of a pure Pt/Pt electrode and one modified with ad-atoms when in contact with ethylene glycol at open circuit, were examined. Dehydrogenation and hydrogenation processes in the adsorption of ethylene glycol and oxalic acid on the electrode and the formation of two types of chemisorbed molecules (easily and sparingly oxidizable ones) were determined. On the basis of steady-state current-potential curves it was determined that the acceleration of the electro-oxidation of ethylene glycol by tin ad-atoms was 2–2.5 orders of magnitude in acidic systems and 1–1.5 orders of magnitude in alkaline systems, while lead atoms in alkaline systems accelerate the process by 2 orders of magnitude. The electro-oxidation rate of ethylene glycol in acidic systems is not affected by Cd 2+ cations. At higher concentrations Cd 2+ cations inhibit the electro-oxidation of oxalic acid. The latter process is also inhibited by tin ad-atoms. The effect of tin ad-atoms on the oxidation of the chemisorption products of ethylene glycol and the nature of the other effects found, are discussed.
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