Gas diffusion layer having carbon particle mixture

The invention relates to a gas diffusion layer, a device having the gas diffusion layer and a catalyst layer, a fuel cell containing the gas diffusion layer, and a gas diffusion electrode. The gas diffusion layer comprises a flexible, electrically non-conductive, porous material having a solid matrix, interconnected pores or interstices through the solid matrix, at least one external surface and internal surfaces, which internal surfaces are the surfaces of the walls of the pores or interstices, wherein at least a portion of the at least one external surface is coated with one or more layers of an electrically conductive material, the electrically conductive material comprising a mixture of at least two populations of electrically conductive carbon particles of different size, wherein the at least two populations of electrically conductive carbon particles are substantially uniformly mixed in the direction of a plane extending along the at least one external surface.