Time-dependent ion transport in heterogeneous permselective systems
arXiv:1503.08957 · doi:10.1103/PhysRevE.91.063001
Abstract
The current study extends previous analytical and numerical solutions of chronopotentiometric response of one-dimensional systems consisting of three layers to the more realistic two-dimensional heterogeneous ion-permselective medium. An analytical solution for the transient concentration-polarization problem, under the local electro-neutrality approximation and ideal permselectivity, was obtained using the Laplace transform and separation of variables. Then the two-dimensional electric potential was obtained numerically and was compared to the full Poisson-Nernst-Planck solution. It was then shown that the resultant voltage drop across the system varies between the initial Ohmic response and that of the steady-state accounting for concentration-polarization. Also, field-focusing effect in a two-dimensional system is shown to result in a faster depletion of ions at the permselective interface.
Submitted to Phys. Rev. E. Includes 6 figures