Warburg impedance ‐ basics revisited

Electrochemical impedance spectroscopy has become a very important tool in the analysis of an equivalent circuit of an electrochemical cell. Recently a new model was proposed by Taylor and Gileadi for the better understanding of the Warburg process. The model describes an equivalent circuit consisting of capacitance in series with resistance to replace the conventional Warburg impedance in the Randels equivalent circuit. Discusses the above model highlighting the defects in their assumption. Attempts to find a better understanding of the Warburg impedance and discusses various possibilities.