Current—potential characteristic of ion transfer across the interface between two immiscible electrolyte solutions based on the Nernst—Planck equation

Abstract

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.