Toyota Jidosha Kabushiki Kaisha

Toyota Motor Engineering & Manufacturing North America, Inc.

The University of Chicago

Yuichiro Sugiyama

Hisashi Yamamoto

Tetsuo Nagami

Sozaburo Ohashi

Mikihiro Hori

Kazuhiro Miyajima

Tomoyuki Nakano

Takumi Otsubo

Youichirou Yoshii

Nobukazu Takagi

There are provided a stock solution composition for fuel cell vehicle coolant used by dilution with a diluent comprising water and a method for producing the same, and further a fuel cell vehicle coolant composition having improved storage stability and a method for producing the same. The present invention relates to a method for producing a stock solution composition for fuel cell vehicle coolant, wherein the stock solution composition comprises at least one ethylene glycol compound selected from the group consisting of ethylene glycol, diethylene glycol, and triethylene glycol, and is used by dilution with a diluent comprising water, and the method comprises the following steps: (a) a step of selecting as a raw material an ethylene glycol compound having an ethylene glycol monoformate content of 60 ppm or less; or (b) a step of selecting as a raw material an ethylene glycol compound, wherein a 50% by mass aqueous solution of the ethylene glycol compound has a conductivity of 4.5 &#x3bc;S/cm or less after heating.

Fuel cell vehicle coolant having improved storage stability and method for producing the same

The present invention specifies the physical property valves of a catalytic layer correlating with the performance of a fuel cell, and provides the catalytic layer having the physical proper values and a fuel cell. Specifically, in a fuel cell having a membrane-electrode assembly provided with a catalytic layeron each side of an electrolyte membrane, an electrode powder constituting the catalytic layershall have an amount of adsorbed water vapor in a range of 52 to 70 cm(STP)/g by a value measured when the water-vapor partial pressure is 0.6, which is determined from the adsorption isotherm of water. The fuel cell having the catalytic layer with the use of the electrode powder having the amount of adsorbed water vapor in this range has the output performance of 0.6 A/cmor higher by current density at 0.6 V, in a less humidified condition and a more humidified condition.

Fuel cell and electrode powder constituting the catalytic layer thereof

A proton conducting polymer is described herein which generally comprises a proton donating polymer and a Lewis acid. The Lewis acids may comprise one or more rare earth triflates. The proton conducting polymer exhibits excellent proton conductivity in low humidity environments.

Electrolyte utilizing a lewis acid/bronstead acid complex

A cationic conductive polymer is described herein which generally comprises a proton donating polymer and an oxocarbonic acid. The cationic conductive polymer exhibits a high conductivity in low humidity environments.

Proton conducting electrolyte

A novel polymer electrolyte is provided that enables a solid polymer electrolyte used in fuel cells, for example, to have sufficient proton conductivity even in a low-water-content state or a zero-water-content state by using a monomer compound represented by the general formula (1), and a graft copolymer compound in which the monomer compound represented by the general formula (1) is graft-copolymerized to the main chain of a fluorine-containing hydrocarbon polymer. 

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Nagoya, Japan

Yuichiro Sugiyama