Abstract
Solid Oxide Fuel Cells (SOFCs) have great advantage of high efficiency and fuel flexibility. For the SOFC electrodes, porous structure is commonly used and its microstructure is considered to have a significant impact on the performance and durability. In this study, we focused on the SOFC anode composed of Ni and YSZ. Two anodes with different performance were prepared and were supplied for microstructure observation by a focused-ion beam and scanning electron microscope (FIB-SEM). 3D microstructure is reconstructed from the obtained images to quantify the microstructural parameters, such as volume fraction, surface-to-volume ratio, contact area density, and three-phase boundary density. The relationship between the anode performance and the microstructure are discussed. Obtained parameters are applied for 1D numerical simulation. The obtained results showed that the performance difference can be explained by the difference of TPB density and can qualitatively be reproduced by 1D simulation.
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