Toray Industries, Inc.

Japan Vilene Company, Ltd.

Yumiko Okamoto

Daisuke Izuhara

Hiroaki Umeda

Junpei Yamaguchi

Tomoyuki Kunita

Takashi Tarao

Tatsunori Ito

Shusuke Shirai

Noriko Michihata

Yuuta Wakamoto

A composite polymer electrolyte membrane has a high proton conductivity even under low-humidity, low-temperature conditions, a reduced dimensional change rate, a high mechanical strength and high chemical stability, and produces a solid polymer electrolyte fuel cell with a high output and high physical durability, a membrane electrode assembly, and a solid polymer electrolyte fuel cell containing the same. This composite polymer electrolyte membrane contains a composite layer composed mainly of a polyazole-containing nanofiber nonwoven fabric (A) and an ionic group-containing polymer electrolyte (B), the polyazole-containing nanofiber nonwoven fabric (A) being basic.

Composite polymer electrolyte membrane, membrane electrode assembly and solid polymer fuel cell using same

A composite polymer electrolyte membrane includes a composite layer of an aromatic hydrocarbon-based polymer electrolyte and a fluorine-containing polymer porous membrane, wherein a ratio (O/F ratio) of an atomic composition percentage of oxygen O (at %) to an atomic composition percentage of fluorine F (at %) on an outermost surface of the fluorine-containing polymer porous membrane as measured by X-ray photoelectron spectroscopy (XPS) is 0.20 or more to 2.0 or less, and the aromatic hydrocarbon-based polymer electrolyte in the composite layer forms a phase separation structure.

Composite polymer electrolyte membrane, and catalyst-coated membrane, membrane electrode assembly, and polymer electrolyte fuel cell using the composite polymer electrolyte membrane

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Otsu, Japan

Yumiko Okamoto