J0802-2-2 FIB-SEM再構築構造を用いたSOFC燃料極の三次元数値シミュレーション([J0802-2]SOFC(1))

概要

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Different samples of Ni-YSZ anode were reconstructed by using a dual beam focused ion beam scanning electron microscopy (FIB-SEM). In these samples, tortuosity factors were calculated to evaluate area dependency. Tortuosity factors of pore and YSZ phases converged as cross sectional area increased, but that of Ni phase did not. This is because Ni particles were larger than the others. The overpotential calculations showed nearly the same results for different samples. Overpotential calculations were also conducted under different steam (3, 10, 20% H_2O), and temperature conditions (1023K, 1073K, 1123K). The results for different steam conditions showed that diffusion and exchange current density models must be modified. On the other hand, activation energy used in the model reproduced well the temperature dependence of the experimental data.
2010-09-04