Abstract: A unit, including an assembly of two gas diffusion electrodes, between which a membrane is sandwiched. The assembly is sealingly connected by a first seal to a frame enclosing the assembly at an outer periphery thereof. The frame includes two opposite end faces. The frame includes duct-like apertures extending from a first end face of the two opposite end faces to a second end face of the two opposite end faces of the frame. The apertures are enclosed by second seals at the end faces on both sides of the frame and are sealed off with respect to each other.

Abstract: A gas diffusion assembly for a fuel cell includes: a sheetlike gas diffusion layer disposed on a carrier substrate, a sealing arrangement being disposed on at least one main side of the carrier substrate, and a connecting portion of the sealing arrangement being assigned to a surrounding edge of the gas diffusion layer, the connecting portion forming a sealing bead. The connecting portion fastens the gas diffusion layer with material bonding on the carrier substrate.