Dynamic properties of the electric double layer in electrolytes

•Numerical model for simulating transient process in electrical double layer.•Dynamics of electric potential and space charge formation for the step voltage.•Impedance calculation for sinusoidal excitation.•Effect of the voltage level on current distortion.•Effect of voltage, solution concentration on the layer impedance.

The aim of this paper is to numerically investigate the characteristics of the Electrical Double Layer in electrolytes. The surface adsorption is neglected, which means there is no electric current injected to the solution from the electrode. The analysis is done for a one-dimensional model as the Debye length for electrolytes is much smaller than other dimensions of the system. The discussion is focused on the behaviour of the electric current and the layer impedance at different frequencies of the supply voltage.