Equivalent circuit modelling using electrochemical impedance spectroscopy for different materials of SOFC

Suitable models are required to interpret the data for the characterization of the systems using EIS. On the basis of their interpretations, the models are divided into two kinds: process models and equivalent circuit models. These models use the experimental data for the estimation of the parameters which describes this data adequately and are used for the analysis of the system's behavior in different conditions. In this paper, the equivalent circuits for EIS of different cathode materials are modeled, which are most commonly used for the interpretation of the electrochemical impedance data. In the modeling of the electrochemical performance, these models are built using the passive elements like-inductors, resistors, and capacitors and also the distributed elements like-Warburg diffusion impedance, Gerischer diffusion impedance, CPE (Constant Phase Element). The different combinations of these elements are used to build the equivalent circuits. Each element has some physical meaning in the equivalent circuits.