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The Predicted Effects of Anode Microstructure on SOFC Overpotentials

A one-dimensional SOFC model with button-cell geometry has been developed to explore the impact of electrode microstructure on overpotentials. The model couples porous media transport with charge transport and detailed electrochemical kinetics. Exploration of microstructural parameters over a range of values shows that model results are most sensitive to variations in tortuosity, porosity, pore radius, and length of three-phase boundary. In order to explore the relation of these parameters to one another and the coupling between microstructure and performance in experimental results, modeling efforts focus on humidified H2 fuel with Ni/YSZ anodes and LSM/YSZ cathodes. To match experimental results from Zhao & Virkar (1), it is shown that simulations must include correlation between porosity, tortuosity, and the thickness of the electrochemically active region in the anode. These results indicate the importance of models that allow electrochemical reactions to occur throughout the depth of the electrode.