D143 ランダムウォークによる拡散シミュレーションに基づくSOFC多孔質電極ミクロ構造の定量化(多孔質中の熱・物質輸送現象II)

概要

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Microstructural properties of an SOFC anode, such as tortuosity factor, surface-to-volume ratio and permeability, are quantitatively evaluated using three-dimensional data obtained by a focused ion beam and scanning electron microscope, FIB-SEM. Random-walk-based diffusion simulation is applied to evaluate these properties, in which the diffusion of imaginary particles is considered. The relationships among these properties and their effects on transport phenomena in a porous anode are discussed. It is revealed that large tortuosity factors of the Ni and YSZ phases are caused by inefficient network of the Ni phase and complex microstructural configuration of the YSZ phase, respectively.
2009-11-06