| 摘要 |
A diffusion layer structure of a fuel cell includes a diffusion layer and a microporous layer. P1/P2 is in a range of 2 to 15 where "P1" is defined as an actual measurement value of pressure drop caused when air penetrates through the diffusion layer having a penetration area of 1.86 cm2 at a flow rate of 2 L/min and where "P2" is defined as a theoretical value of pressure drop defined by formula (1). P2=thickness×10-7×(1-porosity)2/(mean flow pore size2×porosity3)formula (1) where "thickness" indicates a thickness (mum) of the diffusion layer, "porosity" indicates a porosity (%) of the diffusion layer, and "mean flow pore size" indicates a mean flow pore size (mum) of the diffusion layer. |
