A deconvolution method to model electrode processes in solid oxide cells

Electrochemical impedance spectroscopy (EIS) was utilized to characterize an anode-supported solid oxide cell. In order to define a suitable equivalent circuit model (ECM), the corresponding distribution of relaxation times (DRT) curves were calculated. DRT was implemented as a deconvolution method to pre-identify the electrode polarization processes at various temperatures and gas compositions. Based on the DRT plots, a general strategy for the identification of the reaction mechanisms was achieved. It was shown that gas diffusion process in cathode can be characterized only at low oxygen partial pressures.