Abstract
A model is suggested, which generalized the Alekseev-Popov-Kolotyrkin model for the case of mixed solutions of constant ionic strength of the type mc KA*− + (1 − m)c KA, where A*− is the surface-active anion that lowers the electrical double layer capacitance as compared with that observed in the presence of surface-inactive anion A−. Calculations made for a real system mc NaNO3 + (1 − m)c NaF showed that at 0.2 ≤ m ≤ 1 a transition occurred from quadratic to linear dependence of adsorption energy on the electrode potential (or charge). The conclusions are in agreement with experimental data obtained for the studied system.
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