DIAPHRAGM/ELECTRODE UNIT FOR A LOW-TEMPERATURE FUEL CELL AND METHOD FOR ITS PRODUCTION

摘要

The invention relates to a low-temperature fuel cell and to a method for producing the same, having a diaphragm and two electrodes arranged thereon, each comprising a diffusion layer and a carbon carrier layer with a catalyst. It is characterized by the fact that at least one diffusion layer and the diaphragm are adhesively bonded to one another via locally defined joins, wherein the locally defined joins make up a maximum of 30% of the interface to be connected. The joins are in this case not two-dimensional, but are locally defined, in particular punctiform or linear. This additional adhesive bonding, for example consisting of Nafion®, results in extensive interleaving of the polymer electrolyte diaphragm and the electrode, since it can advantageously reach further through the individual carbon carrier particles as far as the diffusion layer. The extension produced by the swelling of the polymer electrolyte diaphragm is now markedly reduced by the interleaving with the electrode. Tears within the carbon carrier layers therefore advantageously no longer arise as easily.