Electrolytes in the Framework of the Grahame
Parsons Model
B. B. Damaskin and O. A. Baturina
Moscow State University, Vorob’evy gory, Moscow, 119899 Russia
Received April 24, 1997
Abstract—Equations, allowing one to calculate the differential capacitance and interfacial tension of the mer-
cury electrode during co-adsorption of cation and anion from a binary electrolyte, are derived on the basis of
some virial isotherms combined with the Grahame–Parsons postulate about a superposition of electric fields
created by the electrode charge and charges of ions adsorbed specifically. The adsorption behavior of a model-
ing system suggests that, at certain potentials, the capacitance and the interfacial tension values are ambiguous,
implying that the model application is restricted.
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