Flexible membrane for fuel cells, e.g. for cars or domestic systems, comprises a porous composite support filled with polymer electrolyte, a porous substrate of glass or polymer fibres, and a porous ceramic coating

摘要

Fuel cell membrane which is impermeable to the reaction components comprises a flexible, permeable composite support in which the pores are 75% filled with a proton-conducting polymer electrolyte, a flexible porous two-dimensional substrate made of woven and/or non-woven glass or polymer fibres, and a porous ceramic coating. Dimensionally-stable, proton-conducting, flexible membrane (FM) for fuel cells which is impermeable to the reaction components in fuel cell reactions, comprising a flexible, permeable composite support, a flexible substrate with a large number of openings and a coating in this substrate. The substrate material consists of woven and/or non-woven glass or polymer fibres, the coating is a porous ceramic coating and the pores in the support are filled to at least 75% with a proton-conducting polymer electrolyte. Independent claims are also included for (a) a method (M1) for the production of FM by infiltrating electrolyte(s) or polymer electrolyte(s) or precursors thereof into the pores of the support as above (b) a flexible membrane-electrode unit (MEU) for fuel cells, with conductive anode and cathode layers on either side of FM (c) a method (M2) for the production of MEU by making FM as above, preparing a material for the production of electrode layers (proton-conductive component, catalyst (or precursor) for the anode or cathode reaction, optionally a catalyst support and optionally a pore-former), coating this material onto each side of the membrane (FM) and producing a strong bond between the coatings and the membrane, with the formation of a porous, proton-conducting anode or cathode layer (d) fuel cells containing FM or MEU (e) mobile or stationary systems with an MEU, fuel cell or fuel cell stack containing FM or MEU as above.