High water permeability proton exchange membrane

Details High water permeability proton exchange membrane High water permeability proton exchange membrane

2005-01-11

2005-01-11

Weiner, Laura (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S047000, C429S047000, C429S309000, C521S027000

Reexamination Certificate

active

06841283

ABSTRACT:
A high water permeability proton exchange membrane (12) is disclosed for use in an electrochemical cell, such as a fuel cell (10) or an electrolysis cell. The membrane (12) includes: a. between about 20 volume percent (“vol. %”) and about 40 vol. % of a structural insulating phase (40); between about 50 vol. % and about 70 vol. % of a hydrated nanoporous ionomer phase (42); and, about 10 vol. % of a microporous water-filled phase (44). The structural insulating material (40) defines an overall membrane volume, and the ionomer phase (42) fills all but 10% of the overall volume so that the microporous water-filled phase (44) is defined within the ionomer phase (42) and consists of open pores having a diameter of between 0.3 microns and 1.0 microns. Water transport is enhanced between opposed catalytic surfaces (14), (16) of the membrane (12).

REFERENCES:
patent: 4017664 (1977-04-01), Breault
patent: 5547551 (1996-08-01), Bahar et al.
patent: 5599614 (1997-02-01), Bahar et al.
patent: 6248469 (2001-06-01), Formato et al.

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