SOFC燃料極多孔質体における透過率のガス種依存性

抄録

In porous anodes of solid oxide fuel cells, there exists a pressure gradient and a concentration gradient, particularly in the thickness direction. Permeability, a property for pressure-driven gas transport, is closely related to the pore structure. It also depends on the permeation gas in the case of systems with a large Knudsen number, such as porous anodes. However, the effect of the gas species on permeability has yet to be clarified sufficiently. Therefore, gas-species dependence of permeation was experimentally and numerically investigated. Permeability measurements using multiple gases show that the correlation between the permeability and the mean free path of the gas molecules is linear. 3D numerical simulation shows that the permeation flow for each gas is kinematically similar, and its absolute flow rate depends on the physical properties of the permeation gas.