Elsevier

Electrochimica Acta

Volume 38, Issue 15, October 1993, Pages 2217-2222
Electrochimica Acta

Contribution to the elucidation of the redox behaviour of camphorquinone—II. Voltammetric study of the rate-controlled adsorption—desorption of the product of the electrode reaction on a mercury electrode

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Abstract

The electroreduction of camphorquinone, CQ, at a mercury electrode was studied by linear-sweep cyclic voltammetry in buffered aqueous solutions. A pre-peak system was observed at CQ concentrations above 5 × 10−4 M. The influence of pH, CQ concentration and scan rate on these peaks was studied. The experimental results can be justified only if the peaks are caused by the strong product adsorption at the electrode. At low scan rate values and high concentrations the behaviour can be explained if the adsorption is in equilibrium. In the rest of cases the process is controlled by the adsorption-desorption rate, even though some deviations from theoretical predictions are observed. Such deviations can be ascribed to the occurrence of side interactions between adsorbed molecules. The adsorption of CQ itself and the complexity of the reduction mechanism complicates the analysis of the adsorption—desorption pre-peak system.

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1

Permenant address: Departmento de Química y Física, Universidad Nacional de Río Cuarto, Estafeta no. 9, 5800-Río Cuarto, Córdoba, Argentina.

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