engleski

Theory of square-wave voltammetry of a reversible redox reaction complicated by the reactant adsorption

A theoretical model of square-wave voltammetry combined with the adsorptive accumulation of the reactant is developed. On a stationary spherical electrode square-wave voltammograms of a reversible redox reaction complicated by the reactant adsorption depend on lateral interactions in the monolayer. Attraction forces increase the difference between the potentials of the maxima of the post-peak and the main peak, and they may cause the splitting of the post-peak, while repulsion prevents the separation of these two peaks. The manifestation of anion-induced adsorption of metal ions is the increasing and decreasing of the maximum response as the function of ligand concentration. The applicaton of this phenomenon for the qualitative metal speciation at interfeces is discussed. It is shown that the response is not distorted by the adsorption induced capacitive current.

square-wave voltammetry; adsorption

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