Simulation of capacitive deionization accounting the change of Stern layer thickness

Abstract

Dynamics of deionization of electrolyte solution by sorption on aerogel electrodes is studied in the work on the basis of mathematical modeling. The processes of substance transfer by solution flow, diffusion and sorption in pores are taken into account. It is shown that for the correct description of the physical processes occurring in the deionizer under the potential difference on the electrode plates it is necessary to take into account the finite size of the hydrated ions and the change of the Stern layer on the surface of pores during substance diffusion. The change of the Stern layer is studied on the basis of mathematical modeling. The examples of simulation of the deionization process in a cyclic mode for different values of physical parameters are given.