Asahi Glass Company, Limited

Elna Co., Ltd.

Agc Inc.

Agency of Industrial Science and Technology

Kawasaki Kasei Chemicals Ltd.

Eiji Endoh

Yoshio Oda

Hiroshi Otouma

Shinji Terazono

Hideki Nakagawa

Hisao Kawazoe

Takeshi Morimoto

Masaru Yoshitake

Yasuhiro Kunisa

Eiji Yanagisawa

Haruo Jinbo

Susumu Saito

Koichi Murata

Taiki Hoshino

Atsushi Watakabe

Tetsuji Shimohira

Satoru Hommura

Seigo Kotera

Satoshi Takemiya

Tatsuya Andoh

Junichi Tayanagi

Yoshitaka Doi

Masanori Sawaguchi

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 polymer electrolyte membrane which comprises a polymer electrolyte having sulfonic acid groups, and contains any one of the following (a) to (c):

Polymer electrolyte membrane and membrane-electrode assembly for polymer electrolyte fuel cell

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

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

An electrolyte material for polymer electrolyte fuel cells, which is made of a polymer containing repeating units based on a fluoromonomer having a radical polymerization reactivity, wherein the repeating units contain a 5-membered ring (which may contain 1 or 2 oxygen atoms), of which at least one carbon atom is contained in the main chain of the polymer, and an ionic group such as a sulfonic acid group which is bonded to the 5-membered ring directly or via a perfluoroalkylene group having a linear or branched structure; and the polymer has a softening temperature of at least 120&#xb0; C.

Electrolyte material for polymer electrolyte fuel cells, electrolyte membrane and membrane-electrode assembly

A polymer electrolyte fuel cell comprising a polymer electrolyte made of an ion exchange membrane, catalyst layers disposed on both sides thereof and current collectors disposed on the outer sides thereof, wherein a solvent-soluble fluorine-containing polymer (preferably a polymer having a fluorine-containing aliphatic ring structure) having substantially no ion exchange groups, is incorporated in the current collectors. By the above construction, the current collectors can have a high water repellency for a long period of time, and the polymer electrolyte fuel cell can operate at a high output density constantly over a long period of time.

Solid polymer type fuel cell and production method thereof

A polymer electrolyte fuel cell comprising a plurality of membrane electrode assemblies laminated via separators, each assembly comprising a membrane-form polymer electrolyte and a pair of a fuel electrode and an air electrode facing each other via the electrolyte, wherein as the separator, a separator made of a metal/non-metal composite material, is used which has a fuel gas channel, an oxidant channel and a fluid channel for cooling, and at least side walls of the fluid channel for cooling are made of metal and at least faces which are in contact with the membrane electrode assemblies are made of non-metal. The separators are excellent in the dimensional stability and air-tightness and light in weight, and the polymer electrolyte fuel cell having such separators can maintain a high performance constantly for a long time.

Solid polymer electrolyte fuel cell

Method for producing polysulfides by electrolytic oxidation

Semiconducting photocatalytic substance and fine oxide particles dispersed therein form a photocatalyst composition, with the photocatalyst composition having a band gap which is larger by at least 0.05 eV than the band gap of the semiconducting photocatalytic substance per se.

Photocatalyst composition and process for its production, and

A method for chemically etching an aluminum foil for an aluminum electrolytic capacitor, which comprises immersing the aluminum foil in an etching solution containing a polymer electrolyte having cation exchange groups dissociable in the etching solution.

Method for etching an aluminum foil for an electrolytic capacitor

A method for etching an aluminum foil for an aluminum electrolytic capacitor, which comprises immersing the aluminum foil in an etching solution containing a polymer electrolyte having cation exchange groups dissociable in the etching solution, and applying an electric current thereto.

Growing community of inventors

Yokohama, Japan

Eiji Endoh