Membrane-electrode assembly, polymer membranes for a membrane-electrode assembly, polymer electrolyte fuel cells, and methods for the production thereof
AssigneeElcomax Membranes GmbH
InventorsDieter Melzner, Annette Reiche, Ulrich Maehr, Suzana Kiel
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Abstract
A membrane-electrode assembly and polymer electrolyte fuel cells and methods of production thereof, in which a polymer membrane, containing at least one basic polymer membrane, is sandwiched between two flat gas diffusion electrodes each of which is loaded with a dopant, whereby after reaching a mass transport equilibrium for the exchange of the dopant between the gas diffusion electrodes and the polymer membrane, the polymer membrane has a conductivity of at least 0.1 S/m at a temperature of no less than 25° C.
Claims19
A membrane-electrode assembly comprising
- two flat gas diffusion electrodes each loaded with a dopant, and
- a polymer membrane comprising at least one basic polymer, the polymer membrane sandwiched between said electrodes,
- wherein the gas diffusion electrodes are loaded with a content of dopant of 60 to 120% of the weight of the basic polymer in the polymer membrane, and wherein after reaching a mass transport equilibrium for the exchange of the dopant between the gas diffusion electrodes and the polymer membrane, the polymer membrane has a conductivity of at least 0.1 S/m at a temperature of no less than 25° C.
A polymer electrolyte fuel cell comprising a membrane-electrode assembly arranged between bipolar plates, the membrane electrode assembly comprising:
- two flat gas diffusion electrodes each loaded with a dopant, and
- a polymer membrane comprising at least one basic polymer, the polymer membrane sandwiched between said electrodes,
- wherein the gas diffusion electrodes are loaded with a content of dopant of 60 to 120% of the weight of the basic polymer in the polymer membrane, and wherein after reaching a mass transport equilibrium for the exchange of the dopant between the gas diffusion electrodes and the polymer membrane, the polymer membrane has a conductivity of at least 0.1 S/m at a temperature of no less than 25° C.
Dependencies are inferred from the claim text.