Asahi Glass Company, Limited

Agc Inc.

Gm Global Technolgoy Operations, Inc.

Shinji Terazono

Eiji Endoh

Hideki Nakagawa

Hisao Kawazoe

Satoshi Kawaguchi

Mitsugu Kasagawa

Xu Wang

Naoki Yoshida

Masahiro Kanda

Masaru Yoshitake

Kohta Yamada

Toyoaki Ishizaki

Hiroshi Shimoda

Toshihiro Tanuma

Chunxin Ji

Seigo Kotera

Hubert Gasteiger

Susan Yan

Shinji Kinoshita

Hirokazu Wakabayashi

Bhaskar Sompalli

Widjaja Hardiyanto

Yuki Hayasaka

Atsuo Okawara

Toshio Suzuki

An electrolyte membrane is prepared from a liquid composition comprising at least one member selected from the group consisting of trivalent cerium, tetravalent cerium, bivalent manganese and trivalent manganese; and a polymer with a cation-exchange group. The liquid composition is preferably one containing water, a carbonate of cerium or manganese, and a polymer with a cation-exchange group, and a cast film thereof is used as an electrolyte membrane to prepare a membrane-electrode assembly. The present invention successfully provides a membrane-electrode assembly for polymer electrolyte fuel cells being capable of generating the electric power in high energy efficiency, having high power generation performance regardless of the dew point of the feed gas, and being capable of stably generating the electric power over a long period of time.

Liquid composition, process for its production, and process for producing membrane-electrode assembly for polymer electrolyte fuel cells

A method for producing a hydrofluoroolefin is provided. The formation of by-products of an over-reduced product having hydrogen added to a material chlorofluoroolefin and an over-reduced product having not only chlorine atoms but also fluorine atoms in the chlorofluoroolefin replaced with hydrogen atoms is suppressed in the method. The method includes reacting a specific chlorofluoroolefin with hydrogen in the presence of a catalyst supported on a carrier to obtain the hydrofluoroolefin. The catalyst is a catalyst composed of an alloy containing at least one platinum group element of palladium and platinum, and at least one second element of copper, gold, lithium, potassium, silver, zinc, tin, lead, and bismuth.

Process for producing hydrofluoroolefin

To provide a method for producing a hydrofluoroolefin, wherein formation of an over-reduced product having hydrogen added to an aimed hydrofluorolefin and an over-reduced product having some of fluorine atoms in the aimed product replaced with hydrogen atoms, as by-products, is suppressed. A method for producing a hydrofluoroolefin, which comprises reacting a specific chlorofluoroolefin with hydrogen in the presence of a catalyst supported on a carrier, to obtain a specific hydrofluoroolefin, wherein the catalyst is a catalyst composed of particles of an alloy containing at least one platinum group metal selected from the group consisting of palladium and platinum, and gold, and the proportion of the gold at the surface of the alloy particles is from 5 to 30 mass % per 100 mass % in total of the platinum group metal and the gold at the surface of the alloy particles.

Method for producing hydrofluoroolefin

A method for producing a hydrofluoroolefin is provided. The formation of by-products of an over-reduced product having hydrogen added to a material chlorofluoroolefin and an over-reduced product having not only chlorine atoms but also fluorine atoms in the chlorofluoroolefin replaced with hydrogen atoms is suppressed in the method. The method includes reacting a specific chlorofluoroolefin with hydrogen in the presence of a catalyst supported on a carrier to obtain the hydrofluoroolefin. The catalyst is a catalyst composed of an alloy containing at least one platinum group element of palladium and platinum, and at least one second element of manganese, copper, aluminum, gold, lithium, sodium, potassium, magnesium, silver, zinc, cadmium, indium, silicon, germanium, tin, lead, arsenic, antimony, and bismuth.

A hydrofluoroolefin is produced by reacting a chlorofluoroolefin with hydrogen in the presence of a platinum group metal catalyst supported on a carbon carrier to obtain a hydrofluoroolefin. The chlorofluoroolefin is represented by formula (1): CZX&#x2550;CClY, where X is F or Cl, Y is F, Cl or H, and Z is F or CF. The hydrofluoroolefin is represented by formula (2): CZX' &#x2550;CHY&#x2032;, where X&#x2032; is F when X is F, or X&#x2032; is H when X is Cl, Y&#x2032; is F when Y is F, or Y&#x2032; is H when Y is Cl or H, and Z is the same as Z in the formula (1). The carbon carrier has acidic functional groups, and the total acidic functional group amount in the carbon carrier is at most 50 &#x3bc;mol/g.

An electrolyte membrane which comprises a cation exchange membrane made of a polymer having cation exchange groups and contains cerium ions is used as an electrolyte membrane for a polymer electrolyte fuel cell. In a case where the cation exchange membrane has sulfonic acid groups, the sulfonic acid groups are ion-exchanged, for example, with cerium ions so that cerium ions are contained preferably in an amount of from 0.3 to 20% of &#x2014;SOgroups contained in the cation exchange membrane. A membrane for a polymer electrolyte fuel cell capable of power generation in high energy efficiency, having high power generation performance regardless of the dew point of the feed gas and capable of stable power generation over a long period of time, can be provided.

Electrolyte membrane for polymer electrolyte fuel cell, process for its production and membrane-electrode assembly for polymer electrolyte fuel cell

A membrane/electrode assemblyfor a polymer electrolyte fuel cell, which comprises an anodehaving an anode catalyst layercontaining an anode catalyst and an ion-exchange resin, a cathodehaving a cathode catalyst layercontaining a cathode catalyst and an ion-exchange resin, and a polymer electrolyte membranedisposed between the anodeand the cathode, wherein the anode catalyst is one having platinum or a platinum alloy supported on a carbon, and the amount of platinum or a platinum alloy supported in the anode catalyst is from 1 to 25 mass %; and the anode catalyst layercontains fine particles made of at least one member selected from iridium oxide, iridium, ruthenium oxide and ruthenium, and the fine particles have a specific surface area of from 2 to 50 m/g.

Membrane/electrode assembly for polymer electrolyte fuel cell and process for producing membrane/electrode assembly for polymer electrolyte fuel cell

Liquid composition, process for its production and process for producing membrane-electrode assembly for polymer electrolyte fuel cells

A process comprising: providing a substrate with a catalyst layer thereon; depositing a first ionomer overcoat layer over the catalyst layer, the first ionomer overcoat layer comprising an ionomer and a first solvent; drying the first ionomer overcoat layer to provide a first electrode ionomer overcoat layer; depositing a second ionomer overcoat layer over the first electrode ionomer overcoat layer, and wherein the second ionomer overcoat layer comprises an ionomer and a second solvent.

Method of making fuel cell components including a catalyst layer and a plurality of ionomer overcoat layers

To provide a membrane/electrode assembly and a method for operating a polymer electrolyte fuel cell, whereby power generation will not be terminated even when the power generation is initiated in such an environment that the temperature of the membrane/electrode assembly is at most 0&#xb0; C. A membrane/electrode assemblyfor polymer electrolyte fuel cells, which comprises an anodeand a cathodeeach having a catalyst layercontaining a proton-conductive fluoropolymer (A), and a polymer electrolyte membranecontaining a proton-conductive fluoropolymer (B), disposed between the anodeand the cathode, wherein each of the above proton-conductive fluoropolymer (A) and the above proton-conductive fluoropolymer (B) has an ion exchange capacity of from 1.4 to 1.8 meq/g dry resin, and each of the above proton-conductive fluoropolymer (A) and the above proton-conductive fluoropolymer (B) has a water content of at most 150 mass %.

Membrane/electrode assembly for polymer electrolyte fuel cells, and method for operating polymer electrolyte fuel cell

An electrode for a polymer electrolyte fuel cell, which is a porous gas diffusion electrode comprising a catalyst powder and an ion exchange resin, wherein a solvent-soluble fluorine-containing polymer having substantially no ion exchange groups exists at least at a part of the inner surface of pores of the electrode.

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Yokohama, Japan

Shinji Terazono