Analytical solution of the PNP equations at AC applied voltage

A symmetric binary polymer electrolyte subjected to an AC voltage is considered. The analytical solution of the Poisson–Nernst–Planck equations (PNP) is found and analyzed for small applied voltages. Three distinct time regimes offering different behavior can be discriminated. The experimentally realized stationary behavior is discussed in detail. An expression for the external current is derived. Based on the theoretical result a simple method is suggested of measuring the ion mobility and their concentration separately.

► Analytical solution of Poisson–Nernst–Planck equations.
► Binary polymer electrolyte subjected to an external AC voltage.
► Three well separated time scales exhibiting different behavior.
► The experimentally realized stationary behavior is discussed in detail.
► A method is proposed measuring the mobility and the concentration separately.