MEMBRANE-ELECTRODE UNIT, POLYMER MEMBRANES FOR A MEMBRANE-ELECTRODE UNIT, POLYMER ELECTROLYTE FUEL CELLS, AND METHODS FOR THE PRODUCTION THEREOF

摘要

The invention relates to a membrane-electrode unit and to polymer electrolyte fuel cells composed thereof in a working temperature of up to 250 DEG C and to polymer membranes therefor, as well as to methods for the production thereof. Membrane-electrode units of the polymer electrolyte fuel cells are at least comprised of two flat gas diffusion electrodes and of a polymer membrane, which is arranged therebetween in a sandwich-like manner and which has at least one basis polymer and one dopant, with which the gas diffusion electrodes are charged in such a manner that they constitute a dopant reservoir for the polymer membrane. After the action of pressure and temperature, this polymer membrane is, via the dopant, connected in a proton-conducting and fixed manner to the gas diffuser electrodes. When doped, the polymer membrane has a conductivity of at least 0.1 S/m at a temperature of no lower than 25 DEG C. The invention can be used for the stationary and mobile production of electric current directly from chemical energy.