An improved version of the Kornyshev-Eigen-Wicke model for the diffuse double layer in concentrated electrolytes

The Kornyshev-Eigen-Wicke model for the diffuse double layer in concentrated electrolytes has been improved in two ways. First, the role of the compressibility factor a(0) has been included in the expressions for the electrochemical potentials of the component ions. As a result this quantity also appears in the equations for the potential drop across the diffuse layer, and its differential capacity. Second, an estimate is made of the ion atmosphere effect using the reciprocal of the thickness of the ionic atmosphere. It is shown that these changes result in considerable improvement in the estimates of the diffuse layer potential drop and differential capacity on the basis of Monte Carlo data.