CURRENT POTENTIAL CHARACTERISTIC OF ION TRANSFER ACROSS THE INTERFACE BETWEEN 2 IMMISCIBLE ELECTROLYTE-SOLUTIONS BASED ON THE NERNST-PLANCK EQUATION

A current-potential characteristic for ion transfer across the polarized interface between two immiscible electrolyte solutions (ITIES) is derived using a Goldman-type approximation to solve the Nernst-Planck equation which describes ion transfer across the inner part of the double layer. The proposed model can predict salient features of the current-potential characteristic experimentally observed in monovalent ion transfer across ITIES. The nonlinearity in the current-overpotential characteristic, i.e. the Goldman-type rectification, provides a new way of studying charge transfer kinetics at ITIES.