Gas diffusion layer base material for fuel cells, gas diffusion layer for fuel cells, fuel cells

摘要

The gas diffusion layer base material for a fuel cell of the present invention comprises carbonaceous fibers (A), graphite particles (B), and a carbonaceous material (C) that binds them, and satisfies the following requirements. (1) The particle size of the carbon particles (B) is 20 μm or less, and (2) the carbon material (C) with respect to the total amount of the carbon fiber (A), the carbon particles (B), and the carbon material (C). The mass content is 35% or more, (3) The number of bonded oxygen atoms on the surface of the gas diffusion layer substrate for fuel cells is 1% or more of the total carbon atoms on the surface of the gas diffusion layer substrate for fuel cells [Selection diagram] None