Proton-conducting membrane and use thereof
AssigneeBASF Fuel Cell GmbH
InventorsGordon Calundann, Michael J. Sansone, Oemer Uensal, Joachim Kiefer
Life of this patent
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Abstract
The present invention relates to a novel proton-conducting polymer membrane based on polyazoles which can, because of its excellent chemical and thermal properties, be used in a variety of ways and is particularly useful as polymer electrolyte membrane (PEM) to produce membrane electrode units for PEM fuel cells.
Claims23
An electrode provided with a proton-conducting polymer coating based on polyazoles which is obtained by a process comprising the steps
- (A) Mixing of one or more aromatic tetraamino compounds with one or more aromatic carboxylic acids or esters thereof which contain at least two acid groups per carboxylic acid monomer, or mixing of one or more aromatic and/or heteroaromatic diaminocarboxylic acids, in polyphosphoric acid to form a solution and/or dispersion,
- (B) Application of a layer to an electrode using the mixture from step A),
- (C) Heating of the flat structure/layer obtainable as described in step B) to temperatures of up to 350° C. under inert gas to form the polyazole polymer,
- (D) Treating the membrane formed in step C) by hydrolysis.
A proton-conducting polymer membrane which comprises a polyazole and phosphoric acid and the membrane has a conductivity of at least 0.1 S/cm at a temperature of 120° C.
An electrode provided with a proton-conducting polymer coating based on polyazoles which is obtained by a process comprising the steps
- A) Mixing of one or more aromatic tetraamino compounds with one or more aromatic carboxylic acids or esters thereof which contain at least two acid groups per carboxylic acid monomer, or mixing of one or more aromatic and/or heteroaromatic diaminocarboxylic acids, in polyphosphoric acid to form a solution and/or dispersion,
- B) Heating of the mixture in step A) to temperatures of up to 350° C. under inert gas to form the polyazole polymer,
- C) Application of a layer to an electrode using the mixture from step B),
- D) Treating the membrane formed in step C) by hydrolysis.
Dependencies are inferred from the claim text.