Abstract
The method of a nonlinear regressive analysis of nonequilibrium differential capacitance curves in terms of the Alekseev-Popov-Kolotyrkin (APK) model complemented by the Frumkin isotherm is used to determine adsorption parameters of an organic cation of tetrabutylammonium, an inorganic nitrate anion, and a butanol molecule at an interface with a mercury electrode. The adsorption behavior of the nitrate anion is quantitatively described by the APK model, whereas the Frumkin model is preferable in the case of butanol. With the [C4H9]4N+ cation adsorbed on a mercury electrode, the EDL structure is probably strongly affected by the formation of ionic pairs.
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