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US 8,013,026 B2Granted
Proton-conducting membrane and the use of the same
OwnerGordon Calundann, Michael J. Sansone +2inventors
InventorsGordon Calundann, Michael J. Sansone, Oemer Uensal, Joachim Kiefer
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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
A process to produce proton-conducting polymer membrane based on polyazoles comprising the steps
- A) dissolving a polyazole polymer in polyphosphoric acid to form a solution,
- B) heating the solution obtained as described in step A) to temperatures of up to 400° C., under inert gas,
- C) formulating a membrane on a support using the solution of the polyazole polymer from step B), and
- D) treating the membrane formed in step C) in the presence of moisture at temperatures and for a time which are sufficient for the membrane to become self-supporting so that it can be detached from the support without damage, wherein the polyphosphoric acid used in step A) has an assay calculated as P2O5 (acidimetric) of at least 85%.
1 more element
Dependencies are inferred from the claim text.