Modified model of the anion specific adsorption, based on the dependence of the adsorption energy on the electrode charge

Damaskin, B.B.

Автор: Damaskin B.B.
Журнал: Russian Journal of Electrochemistry
Том: 46
Номер: 9
Год издания: 2010
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 1069
Последняя страница: 1075
DOI: 10.1134/S1023193510090144
Аннотация: Equations for the calculating of surface concentration of specifically adsorbed anions, the electrode potential and differential capacitance, and the surface tension are derived under the conditions that (1) the transition of the anions from the Helmholtz outer plane to the inner one can be described by Frumkin isotherm and (2) the dependence of the transition energy ΔG A on the electrode charge q is determined by the lowering of the dense-layer true capacitance, which occurs when passing from 1,1-valent surface-inactive electrolyte solution to that containing the same cation and a surface-active anion. The derived equations allow giving consistent description of experimental data obtained in Hg/[H2O + mc NH4NO 3 + (1 - m)c NH4F] and Hg/[H2O + mc KCl + (1 - m)c KF] over the entire range of m values. Two models are compared, which allow for the lowering of the dense-layer true capacitance when passing from KF solution to nitrate or chloride solutions. The quantity ΔG A is a function of potential drop in the dense layer in one of the models; of the electrode charge, in the other. The two models agree equally well with the experimental data on the adsorption of nitrate or chloride anions at mercury electrode, both from binary solutions and KF-containing mixed solutions. © 2010 Pleiades Publishing, Ltd.
Добавил в систему: Дамаскин Борис Борисович

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Modified model of the anion specific adsorption, based on the dependence of the adsorption energy on the electrode chargeстатья