Composite ion exchange membrane

Details Composite ion exchange membrane Composite ion exchange membrane

H - Electricity

01

M

H01M 4/94 (2006.01) C08J 5/22 (2006.01) H01M 2/14 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2387210

A composite membrane for use in a fuel cell membrane electrode assembly comprises a porous polymeric substrate and an impregnant partially filling the substrate such that the substrate comprises a first region having pores substantially filled with the impregnant, and a second substantially porous region. The impregnant comprises a ration exchange material. The ration exchange material covers one surface of the substrate in a dense surface layer, contiguous with the first region of the substrate. The substrate has greater than 10% residual porosity, and the composite membrane is substantially gas impermeable and has at least one substantially porous major surface.

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