Asahi Glass Company, Limited

Junichi Tayanagi

Satoru Hommura

Tetsuji Shimohira

Atsushi Watakabe

Susumu Saito

Koichi Murata

Taiki Hoshino

Takashi Saeki

Eiji Endoh

Seigo Kotera

Masanori Sawaguchi

A polymer electrolyte membrane includes: (A) an ion exchange resin comprising cation exchange groups which comprise protons; (B) a cerium ion; and (C) at least one second ion selected from the group consisting of a cesium ion and a rubidium ion. A proportion of the cerium ion to the number of the cation exchange groups (100 mol %) is from 0.7 to 30 mol % such that some of the protons in the cation exchange groups are ion-exchanged by the cerium ion. A proportion of the at least one second ion to the number of the cation exchange groups (100 mol %) is from 0.2 to 15 mol % such that some of the protons in the cation exchange groups are ion-exchanged by the at least one second ion.

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

A process for producing fluoropolymer particles includes preparing a solution/dispersion containing fluoropolymer dissolved/dispersed in a first solvent such that the swelling of fluoropolymer by the first solvent is from 50 to 1,200%, and mixing the solution/dispersion with a second solvent such that fluoropolymer forms particles and the swelling of fluoropolymer by the mixture of the first and second solvents is from 0 to 100%. W/Wis in the range of from 1 to 5, Wrepresents mass of the first solvent, W/ represents mass of the second solvent, W/Wrepresents a ratio of the mass of the second solvent to the mass of the first solvent. S/Sis at most 0.5. Srepresents the swelling by the mixture of the first and second solvents, Srepresents the swelling by the first solvent, and S/Srepresents a ratio of the swelling by the mixture to the swelling by the first solvent.

Process for producing fluoropolymer particles

To provide a fuel cell system provided with a polymer electrolyte fuel cell which is excellent in the power generation characteristics under high temperature and low or no humidity conditions. A fuel cell systemcomprising a polymer electrolyte fuel cellhaving a membrane/electrode assemblyhaving a catalyst layer containing a polymer (H) which has repeating units based on a perfluoromonomer having an alicyclic structure and has ion exchange groups, a temperature controlling means for controlling temperature of the polymer electrolyte fuel cell, a temperature sensorfor detecting temperature of the polymer electrolyte fuel cell, and a controlling devicefor controlling the temperature controlling means based on temperature information from the temperature sensor 38 so that the maximum temperature of the polymer electrolyte fuel cellbecomes within the range of from 90 to 140&#xb0; C.

Fuel cell system

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

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Chiyoda-ku, Japan

Junichi Tayanagi