Membrane-electrode assembly, fuel cell, and fuel cell system

Details Membrane-electrode assembly, fuel cell, and fuel cell system Membrane-electrode assembly, fuel cell, and fuel cell system

H - Electricity

01

M

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

Patent

CA 2719585

A membrane electrode assembly includes solid polymer electrolyte membrane, an anode, and cathode. The cathode has a stacked body formed of a catalyst layer and a gas diffusion layer. The catalyst layer, which contains catalyst metal-supporting carbon particles and an ion conductor, further contains a mesoporous humidity control agent whose amount of water adsorption rises steeply as a relative humidity increases in a specific relative humidity region.

L'invention porte sur un ensemble membrane-électrode (50) qui inclut un film d'électrolyte polymère solide (20), une anode (22) et une cathode (24). La cathode (24) est formée par un corps stratifié présentant une couche de catalyseur (30) et une couche de diffusion de gaz (32). En plus des particules de carbone comportant un métal catalytique supporté sur celles-ci et d'un conducteur ionique, la couche de catalyseur (30) inclut également, dans une région d'humidité relative prédéterminée, un agent ajustant l'humidité mésoporeux qui absorbe davantage d'eau à mesure que l'humidité relative augmente.

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