Abstract: The invention relates to a conductive nonwoven fabric that is carbonized and/or graphitized and possesses a bending rigidity <8 taber, a density of 0.1 g/m3 to 0.5 g/m3, a thickness of 80 ?m to 500 ?m, and an electrical conductivity of 10 to 300 S/cm in the nonwoven fabric strip and 30 to 220 S/cm2 perpendicular to the nonwoven fabric strip.

Abstract: A gas diffusion layer having a layer (2) comprising fibers (1), whereby the fibers (1) are partially provided with a coating material (3), whereby the fibers (1) lie against each other at contact sites (4) and whereby the layer (2) has boundary surfaces (5) facing the surroundings—in terms of achieving the envisaged objective of ensuring an optimal electric conductivity—is characterized in that the fibers are freed of coating material (3) at the contact sites and/or at the boundary surfaces. Furthermore, a method is proposed for the production of a gas diffusion layer, said method comprising the step that the coating material (3) is selectively removed from the fibers (1) in certain areas.

Abstract: A gas diffusion layer, including at least two functional areas (2a, 2b) which are operationally linked to one another, the first area (2a) having a porous structure and the second area (2b) being designed as a stabilization zone, achieves the object of providing a system which implements problem-free operation of a fuel cell while optimizing its efficiency. A system which includes two gas diffusion layers and a method for manufacturing the gas diffusion layer achieve the further cited objects.

Abstract: The invention relates to a conductive nonwoven fabric that is carbonized and/or graphitized and possesses a bending rigidity <8 taber, a density of 0.1 g/m3 to 0.5 g/m3, a thickness of 80 ?m to 500 ?m, and an electrical conductivity of 10 to 300 S/cm in the nonwoven fabric strip and 30 to 220 S/cm2 perpendicular to the nonwoven fabric strip.

Abstract: The invention relates to a conductive nonwoven fabric that is carbonized and/or graphitized and possesses a bending rigidity <8 taber, a density of 0.1 g/m3 to 0.5 g/m3, a thickness of 80 &mgr;m to 500 &mgr;m, and an electrical conductivity of 10 to 300 S/cm in the nonwoven fabric strip and 30 to 220 S/cm2 perpendicular to the nonwoven fabric strip.