Gas diffusion electrode material and production method thereof

Details Gas diffusion electrode material and production method thereof Gas diffusion electrode material and production method thereof

H - Electricity

01

M

H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 4/96 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2623386

A gas diffusion electrode material of the present invention includes: a porous body (1) formed of continuous and discontinuous polytetrafluoroethylene microfibers (2) and having three-dimensionally continuous micropores (4); and a conductive material (3) supported on the porous body (1). Moreover, a density of the polytetrafluoroethylene microfiber (2) is lower in a surface region (1A) of a cross section of the porous body (1) than in an intermediate region (1B) of the cross section. In accordance with the present invention, the polytetrafluoroethylene having the predetermined three-dimensional structure is used, and so on. Therefore, it is possible to provide a gas diffusion electrode material excellent in power generation characteristics and durability.

La présente invention concerne un matériau pour électrode à diffusion de gaz comprenant une substance poreuse (1) composée de microfibres continues ou discontinues de polytétrafluoroéthylène (2) et ayant des micropores continus tridimensionnels (4) et un matériau conducteur (3) retenu dans la substance poreuse (1). La densité des microfibres de polytétrafluoroéthylène (2) est plus petite dans la région extérieure (1A) que dans la région centrale (1B) de la section transversale de la substance poreuse (1). En vertu de l'utilisation du polytétrafluoroéthylène ayant une structure tridimensionnelle donnée, etc., on peut fournir un matériau pour électrode à diffusion de gaz excellent en termes de performance de production d'électricité et de longévité.

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