Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Nippon Steel Chemical & Material Co., Ltd.

Nobuaki Mizutani

Hiroo Yoshikawa

Junji Nakanishi

Kenji Tsubosaka

Tsunemasa Nishida

Mikihiro Kataoka

Toru Yamamoto

Yusuke Itoh

Yousuke Horiuchi

Kotaro Horiai

Masato Hamano

Takeaki Saitou

Kenji Yamamoto

Hiroaki Takahashi

Tomoaki Terada

Yuki Makino

Akihiro Hori

Kohei Koyamada

The present invention relates to an electrode catalyst for a fuel cell that includes a carbon support () having pores () and catalyst particles containing platinum or a platinum alloy supported on the carbon support (). The pores () of the carbon support () have a mode size of pores () in a range of 2.1 nm to 5.1 nm. A total pore volume of the pores () of the carbon support () is in a range of 21 cm/g to 35 cm/g. A distance between the catalyst particles and a surface of the carbon support () is in a range of 2.0 nm to 12 nm as a distance of a 50% cumulative frequency.

Electrode catalyst for fuel cell, method of producing the same, and fuel cell

An electrode catalyst for fuel cells that can inhibit an increase in gas diffusion resistance includes a carbon material having a ratio of a peak intensity Iderived from an amorphous structure to a peak intensity Iderived from a graphite structure in an X-ray diffraction spectrum (ratio I/I) of 0.90 or less as a catalyst-supporting carrier.

Electrode catalyst for fuel cells

An object of the present invention is to achieve both high initial performance and durability performance of a fuel cell. Such object can be achieved by using a fuel cell electrode catalyst that includes a solid carbon carrier and an alloy of platinum and cobalt supported on the carrier.

Fuel cell electrode catalyst and method for producing the same

There is provided a method of manufacturing a membrane electrode assembly that has an electrode catalyst layer formed on a surface of an electrolyte membrane. The electrode catalyst layer formed in the membrane electrode assembly is produced by a drying process that dries a catalyst ink which includes catalyst-supported particles having a catalyst metal supported thereon, a solvent and an ionomer, at a predetermined temperature. The catalyst ink includes a plurality of different solvents having different boiling points. The predetermined temperature is set to be lower than the boiling point of the solvent having the lowest boiling point among the plurality of different solvents.

Method of manufacturing membrane electrode assembly, and membrane electrode assembly

The method of manufacturing a membrane electrode assembly that has an electrode catalyst layer formed on a surface of an electrolyte membrane comprises (a) producing an electrode catalyst layer by drying a catalyst ink that includes catalyst-supported particles having a catalyst metal supported thereon, a solvent and an ionomer; and (b) selecting a produced electrode catalyst layer that contains an amount of sulfate ion equal to or less than a specified reference value, and manufacturing the membrane electrode assembly by using the selected electrode catalyst layer.

Method of manufacturing membrane electrode assembly

This invention is intended to improve the coverage of a platinum or platinum alloy surface with gold when producing a catalyst comprising carrier particles that support gold-modified platinum or platinum alloys. The invention provides a method for producing a catalyst comprising carrier particles that support gold-modified platinum or platinum alloys comprising a step of gold reduction comprising adding carrier particles that support platinum or platinum alloys, a reducing agent, and a gold precursor to a liquid medium and mixing the same, wherein the reducing agent is added to adjust the ORP value (i.e., an oxidation-reduction potential with reference to the silver-silver chloride electrode) of the liquid medium to &#x2212;630 to +230 mV upon completion of addition.

Method for producing catalyst

A method for producing a gold fine particle-supported carrier catalyst for a fuel cell, which reduces a gold ion in a liquid phase reaction system containing a carbon carrier by means of an action of a reducing agent, to reduce the gold ion, deposit, and support a gold fine particle on the carbon carrier, wherein a reduction rate of the gold ion is set within the range of 330 to 550 mV/h, and pH is set within the range of 4.0 to 6.0 to perform the reduction of the gold ion, deposition, and support of the gold fine particle.

Method for producing gold fine particle-supported carrier catalyst for fuel cell, and polymer electrolyte fuel cell catalyst having gold fine particle

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Toyota, Japan

Nobuaki Mizutani