Electrolyte membrane with diffusion barrier, these comprehensive membrane electrode units, manufacturing processes and special uses

摘要

The invention relates to a proton-conducting membrane, a process for its production and its use. DOLLAR A The membrane according to the invention represents a new class of proton-conducting membranes that can be used in particular in fuel cells. Conventional proton-conducting membranes, e.g. B. based on a, in PCT / EP98 / 05939, porous and flexible Kemarik membrane, which is infiltrated with a proton-conducting material, which is then solidified, have the disadvantage that the electrolyte is leached out of such membranes by water or methanol , DOLLAR A The membranes according to the invention have a coating which is insoluble in water and methanol as a diffusion barrier, which prevents water or methanol from being able to leach out the electrolyte. These electrolyte membranes can continue to be flexible and can be used as a membrane in a fuel cell without any problems.