Abstract: Provided are a water electrolysis method and a water electrolysis device in which mixing of the generated hydrogen and oxygen is greatly reduced and which have a high electrolysis efficiency, while being simplified in structure. In the water electrolysis method and water electrolysis device, water is electrolyzed by supplying water to the cathode side of an electrolytic membrane including a solid polymer membrane provided with a catalyst layer on a surface thereof and creating a potential difference between both surfaces of the electrolytic membrane. The temperature-controlled water is supplied only to the cathode side of the electrolytic membrane, while controlling the difference in pressure between both surfaces of the electrolytic membrane to 50 kPa or less.

Abstract: Provided are a water electrolysis method and a water electrolysis device in which mixing of the generated hydrogen and oxygen is greatly reduced and which have a high electrolysis efficiency, while being simplified in structure. In the water electrolysis method and water electrolysis device, water is electrolyzed by supplying water to the cathode side of an electrolytic membrane including a solid polymer membrane provided with a catalyst layer on a surface thereof and creating a potential difference between both surfaces of the electrolytic membrane. The temperature-controlled water is supplied only to the cathode side of the electrolytic membrane, while controlling the difference in pressure between both surfaces of the electrolytic membrane to 50 kPa or less.

Abstract: The present invention is intended to provide a composite membrane excellent in both durability and moisture permeability. The present invention provides a composite membrane formed by laminating a layer of a moisture-permeable resin on one surface of a hydrophobic porous membrane, the composite membrane being characterized in that the layer of the moisture-permeable resin is included in a reinforcing porous membrane.

Abstract: The present invention is intended to provide a composite membrane excellent in both durability and moisture permeability. The present invention provides a composite membrane formed by laminating a layer of a moisture-permeable resin on one surface of a hydrophobic porous membrane, the composite membrane being characterized in that the layer of the moisture-permeable resin is included in a reinforcing porous membrane.

Abstract: The present invention provides a membrane electrode assembly that enhances the reliability, mechanical strength, and handling characteristics of a seal in a solid polymer electrolyte fuel cell. The membrane electrode assembly of the present invention comprises a membrane-electrode structure having electrode layers and gas diffusion layers on both sides of a polymer electrolyte membrane, and a resin frame provided in such a manner as to fully enclose the outer periphery of the electrolyte membrane and to enclose at least portions of the outer peripheries of the gas diffusion layers, the resin frame being provided so as to enclose the electrolyte membrane side. The gas diffusion layer and electrode layer on one side are stacked on a surface of the electrolyte membrane so that a surface region of the electrolyte membrane is left exposed. The gas diffusion layer on the opposite side extends all around the outer periphery of the electrolyte membrane.

Abstract: Disclosed is a fluororesin-coated polymer film for reinforcing a polymer electrolyte membrane, wherein the fluororesin-coated polymer film is fabricated by forming on at least one side of a polymer film a coating of a reaction product of (A) a fluorine-containing copolymer composed of a fluoroolefin, a cyclohexyl group-containing acrylic ester, and a hydroxyl group-containing vinyl ether, and (B) a crosslinking agent having two or more isocyanate groups. The polymer film according to the present invention not only exhibits sufficiently high initial adhesion strength, with respect to the polymer electrolyte membrane, but also retains thereafter high adhesion strength in actual operating environments.

Abstract: Disclosed is a fluororesin-coated polymer film for reinforcing a polymer electrolyte membrane, wherein the fluororesin-coated polymer film is fabricated by forming on at least one side of a polymer film a coating of a reaction product of (A) a fluorine-containing copolymer composed of a fluoroolefin, a cyclohexyl group-containing acrylic ester, and a hydroxyl group-containing vinyl ether, and (B) a crosslinking agent having two or more isocyanate groups. The polymer film according to the present invention not only exhibits sufficiently high initial adhesion strength, with respect to the polymer electrolyte membrane, but also retains thereafter high adhesion strength in actual operating environments.

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.

Abstract: The durability of a solid polymer electrolyte fuel cell can be enhanced by inhibiting deterioration of a polymer electrolyte membrane of a solid polymer electrolyte fuel cell without impairing power generation performance.

Abstract: The present invention provides a membrane electrode assembly that enhances the reliability, mechanical strength, and handling characteristics of a seal in a solid polymer electrolyte fuel cell. The membrane electrode assembly of the present invention comprises a membrane-electrode structure having electrode layers and gas diffusion layers on both sides of a polymer electrolyte membrane, and a resin frame provided in such a manner as to fully enclose the outer periphery of the electrolyte membrane and to enclose at least portions of the outer peripheries of the gas diffusion layers, the resin frame being provided so as to enclose the electrolyte membrane side. The gas diffusion layer and electrode layer on one side are stacked on a surface of the electrolyte membrane so that a surface region of the electrolyte membrane is left exposed. The gas diffusion layer on the opposite side extends all around the outer periphery of the electrolyte membrane.

Abstract: An electrolyte membrane for a solid polymer fuel cell according to the present invention is a laminated body of (1) a first layer 11 comprising an ion exchange resin and (2) a second layer 12 comprising a porous body and an ion exchange resin filled into the fine pores of the porous body and is characterized in that an ion exchange capacity of the ion exchange resin for the second layer 12 is higher than an ion exchange capacity of the ion exchange resin for the first layer 11. Consequently, both of output performance and durability can be achieved simultaneously at a high level.

Abstract: A composite membrane is provided in which a functional separation membrane is adhered to a hydrophilic porous fluoropolymer support membrane whose pores are coated with a fluorine-containing copolymer that provides durable hydrophilic properties to the membrane.

Abstract: The present invention provides porous hydrophilic fluoropolymer membranes whose pores are coated with a hydrophilic fluorine-containing copolymer that provides durable hydrophilic properties to the membrane.

Abstract: A ceramic substrate material containing an amorphous fluorine resin.