engleski

Influence of the kinetics of reactant adsorption in the reverse scan square-wave voltammetry

An electrode reaction complicated by slow adsorption of the reactant is analyzed theoretically for square-wave voltammetry with the inverse scan direction. The relationship between dimensionless net peak current and the logarithm of dimensionless rate constant of adsorption is a curve with the minimum and the maximum. For this reason the ratio of real net peak current and the square-root of frequency is a non-linear function of the logarithm of frequency and exhibits either maximum, or minimum. The frequency of extreme serves for the estimation of the rate constant: log(kads D-1/2) = log(kads*)crit + 0.5 log fcrit, where (kads*)crit is a critical dimensionless rate constant of adsorption. Square-wave voltammetry is sensitive to the kinetics of adsorption if kads < 102 cm/s.

kinetics of reactant adsorption; square wave voltammetry

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