A gas diffusion layer that is usable with a fuel cell includes a material that is adapted to permit a reactant of the fuel cell to diffuse through the material. The material includes flow channels for communicating the reactant so that at least a portion of the reactant diffuses through the material...http://www.google.com/patents/US6280870?utm_source=gb-gplus-sharePatent US6280870 - Combined fuel cell flow plate and gas diffusion layer
