Approach to the molecular models of an interface based on the mean field approximation

Abstract The mean molecular field approximation has been applied to the continuous orientation model of solvent molecules present on the electrode surface. Starting from the partition function of the effect of the orientation of dipolar solvent molecules, the formulae for the Gibbs energy, entropy, potential drop and differential capacity of the inner part of the electrode/electrolyte interface have been derived. The dependence of the mean dipole moment and of the differential capacity on the electrode surface charge is discussed and illustrated.