Transient Impedance Technique for the Study Of Electrode Kinetics: Application to Potentiostatic Methods

摘要

A generalized approach to the study of the dynamic behavior of electrochemical systems is presented in terms of the transient impedance technique. It is shown that interpretation of the time domain electrode response to an arbitrary perturbation by conversion of both functions to the frequency domain allows maximum usage of experimental information with minimum ambiguity. The basis for the use of aperiodic equivalent circuits to represent active or passive electrodes is considered and sample, rigorously derived, circuits are presented. The equivalent circuit approach is thus generalized and it is shown how its use may constitute a convenient shorthand notation for the rigorous solution of the differential equations used to describe a particular electrode model. Application of the transient impedance method to potentiostatic techniques is presented with emphasis upon the manner in which this approach allows instrumental errors and artifacts to be eliminated particularly at high frequencies. (Author)