Comparison and discussion of some theories of the equilibrium electrical double layer in liquid electrolytes

Abstract

Much past work on equilibrium properties of the electrical double layer is discussed. Particular attention is given to attempts to explain the differential capacitance of the double layer, with and without specific adsorption. Many theories of the inner and outer parts of the double layer are discussed, including continuum, discrete, and lattice gas models. It is concluded that although adequate theories of the diffuse part of the double layer exist, none available so far is entirely adequate for the inner layer because of the strong lateral interactions present in it.