Abstract
In anode-supported Solid Oxide Fuel Cells the fuel electrode is usually realized by a supporting substrate and an anode functional layer, both based on nickel/zirconia-cermets with different specific microstructural properties. These two layers have to be designed to fulfill the requirements with respect to electronic and ionic conductivity, diffusive gas transport and hydrogen electrooxidation. In this study a physical meaningful modelling approach describing the coupling of the abovementioned processes in a transmission line model is applied to investigate the impact of material and microstructural properties. Selected material and microstructural parameters were varied to elucidate their impact on the area specific resistance of the anode. Performance simulations were carried out over wide temperature and gas composition ranges. The investigations revealed that an increased ionic conductivity of the zirconia matrix enhances penetration depth and performance. The decrease in particle and pore sizes results in a decreased charge transfer resistance but an increased Knudsen diffusion.
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