4410 SOFC多孔質電極の微細構造設計のための物質輸送・電気化学反応の数値解析(J11-2 SOFC,J11 小型・分散エネルギー技術)

概要

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The effects of electrode microstructure upon the mass transfer characteristics in a solid oxide fuel cell are investigated through detailed numerical simulation using Lattice Boltzmann Method (LBM). The tortuosity factor is calculated in porous electrodes modeled as randomly packed spheres. It is shown that the value of tortuosity factor is significantly smaller than those reported previously. It is increased with decreasing the porosity, while the effect of particle diameter on the tortuosity factor remains relatively small under the present simulation conditions. Due to the increase of tortuosity factor under the low porosity condition, the concentration polarization is increased. By increasing the Ni/YSZ diameter ratio, the ionic conductivity is significantly improved, while gas diffusivity remains almost unchanged. Thus, the electrode performance is improved by controlling the Ni/YSZ diameter ratio.
社団法人日本機械学会の論文
2006-09-15