Capacitive behavior in conducting polymers

The over-all differential capacitance for conducting polymers like polypyrrole and polyvinylferrocene which show a very high redox capacity for the oxidation/reduction process was modeled as a function of applied voltage from the cyclic voltammetric data. The capacitance values are compared with various types of carbon double layer and conventional capacitor devices. Also, the theoretical capacitance values for a cell was estimated by assuming a hypothetical minimum equivalent cell consisting of an anode(Li), a cathode(polypyrrole) and a electrolyte solution (2 mol dm^-3 LiClO₄(PC)) without any hardware. The charge/discharge process or doping/undoping process was determined by impedance analysis and the limiting capacitance was estimated. Also, an attempt was made to separate the faradaic and capacitive currents according to the theory of the impedance of diffusion in a layer of finite thickness.