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US 8,475,964 B2Granted
Membrane-electrode assembly, fuel cell, and fuel cell system
AssigneeSanyo Electric Co., Ltd.
InventorTakaaki Taniguchi
Life of this patent
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Abstract
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.
Claims5
A membrane electrode assembly, comprising:
- an electrolyte membrane;
- an anode disposed on one face of said electrolyte membrane;
- and
- a cathode disposed on the other face of said electrolyte membrane,
- wherein:
- at least either one of the anode and the cathode has a catalyst layer containing a mesoporous humidity control agent whose amount of water adsorption rises steeply as a relative humidity increases in a predetermined relative humidity region,
- the mesoporous humidity control agent is mesoporous silica,
- a humidified reaction gas is supplied to the catalyst layer, and
- the average pore diameter of the mesoporous silica added to an upstream side of the flow of the reaction gas is smaller than the average pore diameter of the mesoporous silica added to a downstream side thereof.
6 more elements
Dependencies are inferred from the claim text.