Charge Dependences of the Inner-Layer Capacitance of EDL
on the Hg, Ga, InGa, and TlGa Electrodes in Methanol
and Ethanol Solutions of Surface-Inactive Electrolytes in Terms
of a Modified Model of the Metal/Solvent Contact

V. V. Emets, B. B. Damaskin*, and V. E. Kazarinov^†

Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117071 Russia

* Moscow State University, Vorob’evy gory, Moscow, 119899 Russia

Received December 30, 1998

Abstract—Curves of the differential capacitance of the inner layer on the Hg, Ga, In–Ga, and Tl–Ga electrodes
in methanol and ethanol solutions are analyzed in terms of a modified Amokrane–Badiali model. Parameters,
obtained for these electrodes correlate with similar parameters found earlier in other solvents. They fit a general
proportional dependence between the shift of the maximum in the curve of the solvent capacitance and a param-
eter characterizing the disturbance of the metal electron plasma due to the metal’s chemisorption interaction
with the solvent. Effects of the metal/solvent chemisorption interaction on the capacitance of the inner layer of
EDL are easily explainable in terms of the modified approach not only in the domain of monotonic variation of
the capacitance with charge but also near points of extremums.

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