# Nonlinear Impedance of Tafelian Electrochemical Systems

Nonlinear Impedance of Tafelian Electrochemical Systems

This Demonstration shows the effects of Tafel kinetics, ohmic potential drop, interfacial capacitance, and amplitude/frequency of sinusoidal potential signals on the nonlinear impedance of electrochemical systems.

The plots show (a) steady-state polarization curve () and curve () corrected for ohmic drop; (b) Lissajous plot under sinusoidal perturbation of potential; (c) potential perturbation and effective interfacial potential scaled by input signal amplitude; (d) periodic current and its fundamental component; (e) faradaic and capacitive contributions to the total current; and (f) Nyquist plots of the usual (linear) impedance () and the nonlinear impedance (), scaled by the low-frequency linear resistance.

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