Abstract: A method is provided for producing a membrane electrode unit, provided with a peripheral seal and a peripheral sealing frame for an electrochemical cell, comprising the steps of: (A) producing a sandwich-like arrangement, forming the membrane electrode unit, from a membrane and two gas diffusion electrodes, (B) connecting the sandwich-like arrangement to a seal that extends around said electrodes at the lateral outer edge thereof, said seal at the same time establishing the connection to the sealing frame that extends laterally around the membrane electrode unit.

Abstract: A method for generating a catalyst-containing electrode layer on a substrate, particularly a catalyst layer for fuel cells or other chemical or electrochemical reactors, comprising the following steps: (A) generating an electrode layer on the substrate, wherein the electrode layer contains carrier particles for the catalyst to be deposited thereon; and simultaneously or subsequently: (B) depositing the catalyst on at least a portion of the carrier particles present in the electrode layer generated according to step (A) with decomposition of a catalyst precursor present not only superficially in the electrode layer, without external application of an electric current, an electric voltage, or an electric field, wherein no washing step takes place that could cause a discharge of the catalyst from the layer.

Abstract: The invention relates to a gas diffusion electrode for polymer electrolyte fuel cells having a working temperature of up to 250° C., comprising a plurality of gas-permeable electroconductive layers having at least one gas diffusion layer and one catalyst layer. The catalyst layer contains particles of an average particle diameter in the nanometer range, said particles containing ionogenic groups. The invention also relates to the production of said gas diffusion electrode and to the use of same in high-temperature polymer electrolyte membrane fuel cells.

Abstract: The invention relates to the use of a material imparting proton conductivity in the production of fuel cells, said material consisting of monomer units and having an irregular shape.

Abstract: A method for producing a catalyst layer (1) for fuel cells, chemical or electrochemical reactors using a precursor layer, which comprises a plurality of electrically conductive precursor particles (3, 4), a catalyst (2) being electrochemically deposited, the catalyst layer (1) being produced as a structured layer. This is achieved by the targeted inhomogeneous selection of the precursor particles (3, 4) with regard to at least one particle property, by the addition of non-conductive particles and/or at least one chemical additive to the precursor layer, and/or in that significant amounts of gas are produced in the catalyst layer or conveyed through said layer before, during, or after the electrochemical deposition.