GAS DIFFUSION ELECTRODE, ITS MANUFACTURING METHOD, AND SOLID POLYMER FUEL CELL USING THIS

摘要

PROBLEM TO BE SOLVED: To provide a gas diffusion electrode for a solid polymer fuel cell in which a closing phenomenon caused by water hardly occurs even in a use for a long period and gas can be supplied stably, and a solid polymer fuel cell using the same.

SOLUTION: This gas diffusion electrode for the solid polymer fuel cell has carbon paper and a carbon layer that is formed on one side or both sides of the paper and is composed of carbon black and polytetrafluoroethylene. A thickness in which the carbon layer enters in the thickness direction of the carbon paper is in a range of 3-35 μm. This gas diffusion electrode can be manufactured by coating on one side or both sides of the carbon paper slurry in which carbon black particles and polytetrafluoroethylene particles having a number average particle size of 0.05-3 μm are dispersed in an alcohol system dispersion medium containing low boiling-point alcohol having a boiling point of 90°C or lower, and by calcining the coating layer.

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