Validation of Various Oxidation and Reduction Models for SOFC Electrodes

Oxidation and reduction models for SOFC electrodes are essential for accurate predictions of performance. In our study, the optimal models for oxidation and reduction in electrodes are determined by comparing results from various models with experimental results. For oxidation in anode, the models we apply include Bessler’s hydrogen oxidation model (2005, 2010) and Butler-Volmer type rate equations. The models used for reduction and transportation of oxygen in cathode included Butler-Volmer model and a micro scale model with parallel 2PB and 3PB pathways. Other reaction kinetics models are also considered. The optimal models are then used in our simulations for full cell study. Parametric studies are performed for better prediction of SOFC electrodes. Different porosity distributions, cell dimensions and concentrations are applied in the simulation, and their effects on the performance are analyzed through quantitative studies involving polarization curves and impedance behavior.