Importance

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Abstract

The objective of the present invention is to provide a membrane electrode assembly, and a solid polymer electrolyte fuel cell having the assembly. The assembly has a member that has excellent gas sealing properties, and at the same time, is capable of improving electrode membrane strength. In the assembly, the polymer electrode membrane is not deteriorated. Further, the assembly is easy to be built up, since the number of components is small. The membrane electrode assembly for a solid polymer electrolyte fuel cell of the present invention is characterized in comprising a polymer electrolyte membrane, a fuel electrode layer and an air electrode layer located respectively on each surface of the membrane, and a fuel electrode diffusing layer and an air electrode diffusing layer located respectively on the fuel electrode layer and the air electrode layer; wherein an area of a planer section of the polymer electrolyte membrane is slightly larger than areas of planer sections of the fuel electrode layer and the air electrode layer; a reinforcing frame formed of a thermosetting resin is located on a part of the polymer electrolyte membrane where the fuel electrode layer or the air electrode layer is not formed on one side or both sides thereof; and a protective later exists in at least a part between the polymer electrolyte membrane and the reinforcing frame.

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First Claim