Quasi-chemical approximation for solvent dipoles at metal/electrolyte interface

The methodology for deriving the differential capacitance at electrochemical interfaces using quasi-chemical approximation is demonstrated for adsorption of solvent dipoles in two configurational states. Explicit results for dipole potential (g(dip)) and the inner layer capacitance (C(i)) are reported. The experimentally observed linear correlation between (1/C(i)) and g(dip), the negative temperature coefficient of the dipole potential at the potential of zero charge, and the occurrence of capacitance maximum at positive charge densities are discussed.