Stationary 2D FEM Model Framework for SOFC Stack Performance Prediction
For state-of-the-art LSCF cathodes as thin as 45 µm, the simulation results demonstrate significant performance loss due to O2starvation underneath the MIC contact ribs and/or electrical cross conduction limitations in the cathode material underneath the gas channel area in each individual stack layer [3,4]. Following up these results, a systematic variation of the cathode parameters thickness, porosity, tortuosity, mean pore diameter, and electrical conductivity as well as of the MIC flowfield design has been carried out numerically. In this way, the sensitivity of each parameter on stack layer performance became transparent.
It will be shown in this work, that (i) choosing an optimized cathode/MIC design combination can increase current density at 0.7V by more than 25% in an SOFC stack assembly (see figure 1), that (ii) the magnitude of possible loss minimization requires the ability to precisely control the system parameters, and that (iii) an optimized MIC design avoids microstructural changes occurring in the cathode/CCL material because of its inherent chemical stability limitations.
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