Abstract
Microstructural evolution and crack propagation occur in Solid Oxide Fuel Cells (SOFCs) at elevated operation temperatures (above 600°C). These phenomena cause performance degradation in electrochemical activity and compromise of structural integrity of SOFCs as well. Nickel (Ni) coarsening of Ni-yttria stabilized zirconia (YSZ) in the anode of a SOFC is believed to lead to microstructural evolution. Meanwhile, stress concentration and pore aggregation causes crack propagation in the anode. Both microstructural evolution and crack propagation have a significant impact on the performance of SOFCs. Based on theories of diffuse-interface and Ginzburg-Landau, an integrated phase field model is developed to couple electrode microstructural evolution and crack propagation in the anode. Interfacial diffusion of the phases is observed to lead to Ni particle coarsening. The triple phase boundary (TPB) is found to be affected by microstructural evolution and the crack propagation.
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