# US 2008/0187815 A1 · Catalytic layer-electrolytic membrane assembly, transfer sheet, and production process thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0187815 A1 - Document ID: US20080187815A1 - Status: Published application - Kind: A1 - Application number: 12/007,629 - Filed: 2008-01-14 - Published: 2008-08-07 - Earliest claimed: 2007-01-16 - Assignees: Dai Nippon Printing Co., Ltd. - Inventors: Masashi Hiromitsu - Web page: https://patentgrep.com/patent/US20080187815A1 ## CPC - H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) - H01M 4/8807: {Gas diffusion layers} - H01M 4/8896: {Pressing, rolling, calendering (membrane electrode assemblies H01M8/1004)} - H01M 4/92: Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) - H01M 4/926: {on carbon or graphite} - H01M 4/881: {Electrolytic membranes} - H01M 8/0243: in the form of mixtures - Y02E 60/50: Fuel cells - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y10T 156/10: Methods of surface bonding and/or assembly therefor - Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention provides a catalytic layer-electrolytic membrane laminate for an unhumidified-type fuel cell, comprising an electrolytic membrane containing a strong acid; a conductive layer formed on one surface or both surfaces of the electrolytic membrane; and a catalytic layer formed on the conductive layer; wherein the conductive layer is formed of a fluorine-containing resin and carbon powder, and the conductive layer is thinner than the electrolytic membrane. The present invention provides a catalytic layer-electrolytic membrane laminate for an unhumidified-type fuel cell that can be practically used. ## Claims ### Claim 1 A catalytic layer-electrolytic membrane laminate for use in an unhumidified-type fuel cell, comprising: an electrolytic membrane containing a strong acid; a conductive layer formed on one surface or both surfaces of the electrolytic membrane; and a catalytic layer formed on the conductive layer; the conductive layer being formed of a fluorine-containing resin and carbon powder, and the conductive layer being thinner than the electrolytic membrane. ### Claim 2 (depends on 1) A catalytic layer-electrolytic membrane laminate according to claim 1, wherein the thickness of the conductive layer is 1/200 to 1/20 that of the electrolytic membrane. ### Claim 3 (depends on 1) A catalytic layer-electrolytic membrane laminate according to claim 1, wherein the thickness of the catalytic layer is 1/20 to 1/4 that of the electrolytic membrane. ### Claim 4 (depends on 1) A catalytic layer-electrolytic membrane laminate according to claim 1, wherein the fluorine-containing resin forming the conductive layer is at least one member selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene/hexafluoropropylene copolymers, perfluoroethylene, polyvinylidene fluoride and perfluorosulfonic acid resins. ### Claim 5 (depends on 1) A catalytic layer-electrolytic membrane laminate according to claim 1, wherein the conductive layer further comprises a non-polymeric fluoride. ### Claim 6 (depends on 5) A catalytic layer-electrolytic membrane laminate according to claim 5, wherein the non-polymeric fluoride is at least one member selected from the group consisting of fluorinated pitch, fluorinated carbon, and fluorinated graphite. ### Claim 7 (depends on 1) A catalytic layer-electrolytic membrane laminate according to claim 1, wherein the catalytic layer comprises a catalyst and a binder, and the binder is a fluorine-containing resin. ### Claim 8 (depends on 7) A catalytic layer-electrolytic membrane laminate according to claim 7, wherein the fluorine-containing resin is at least one member selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene/hexafluoropropylene copolymers, perfluoroethylene, polyvinylidene fluoride and perfluorosulfonic acid resins. ### Claim 9 (depends on 7) A catalytic layer-electrolytic membrane laminate according to claim 7, wherein the catalytic layer further comprises a non-polymeric fluoride. ### Claim 10 (depends on 9) A catalytic layer-electrolytic membrane laminate according to claim 9, wherein the non-polymeric fluoride is at least one member selected from the group consisting of fluorinated pitch, fluorinated carbon, and fluorinated graphite. ### Claim 11 (depends on 1) A process for producing the catalytic layer-electrolytic membrane laminate of claim 1 comprising the steps of: preparing an ink for forming a conductive layer by mixing a fluorine-containing resin and carbon powder; producing a sheet for forming a conductive layer by applying the ink for forming a conductive layer to a substrate; preparing an ink for forming a catalytic layer by mixing a binder and a catalyst; producing a sheet for forming a catalytic layer by applying the ink for forming a catalytic layer to a substrate; transferring a conductive layer to one or both surfaces of an electrolytic membrane that contains a strong acid by heat pressing the sheet for forming a conductive layer; and transferring a catalytic layer to the conductive layer formed on one or both surfaces of the electrolytic membrane that contains a strong acid by heat pressing the sheet for forming a catalytic layer. ### Claim 12 (depends on 1) A process for producing the catalytic layer-electrolytic membrane laminate of claim 1 comprising the steps of: preparing an ink for forming a catalytic layer by mixing a binder and a catalyst; producing a sheet for forming a catalytic layer by applying the ink for forming a catalytic layer to a substrate; preparing an ink for forming a conductive layer by mixing a fluorine-containing resin with carbon powder; producing a sheet for forming a catalytic layer having a conductive layer by applying the ink for forming a conductive layer to the catalytic layer formed on the substrate; and transferring a conductive layer and a catalytic layer to one or both surfaces of the electrolytic membrane that contains a strong acid by heat pressing the sheet for forming a catalytic layer with a conductive layer. ### Claim 13 (depends on 1) A transfer sheet for producing a catalytic layer-electrolytic membrane laminate for use in the unhumidified-type fuel cell of claim 1 comprising: a catalytic layer and a conductive layer formed on a substrate in the order of substrate/catalytic layer/conductive layer; the catalytic layer comprising a binder and a catalyst; and the conductive layer comprising a fluorine-containing resin and carbon powder. ### Claim 14 (depends on 1) A process for obtaining a transfer sheet for producing a catalytic layer-electrolytic membrane laminate for use in the unhumidified-type fuel cell of claim 1 comprising the steps of: preparing an ink for forming a catalytic layer by mixing a binder and a catalyst; producing a sheet for forming a catalytic layer by applying the ink for forming a catalytic layer to a substrate; preparing an ink for forming a conductive layer by mixing a fluorine-containing resin with carbon powder; and producing a sheet for forming a catalytic layer having a conductive layer by applying the ink for forming a conductive layer to the catalytic layer formed on the substrate.