Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Nippon Steel & Sumikin Chemical Co., Ltd.

Mikihiro Hori

Tomoaki Terada

Mikihiro Kataoka

Kotaro Horiai

Hisao Kato

Tetsuo Nagami

Junji Nakanishi

Tsunemasa Nishida

Sozaburo Ohashi

Yusuke Itoh

Yuichiro Sugiyama

Yuusuke Itou

An electrode catalyst for a fuel cell, the electrode catalyst having high initial activity and being capable of long-term retention of said activity; and a fuel cell using the electrode catalyst for a fuel cell. The electrode catalyst for a fuel cell includes catalyst metal particles that include platinum or a platinum alloy, and carrier particles that carry said catalyst metal particles, wherein the carrier particles are a carbonaceous material having a cumulative pore volume of 0.10 cc/g or less in the diameter range of 2 nm or less, and a BET specific surface area of greater than 900 m/g; and a fuel cell comprising the electrode catalyst for a fuel cell.

Electrode catalyst for fuel cell, and fuel cell using same

A membrane electrode assembly for the fuel cell includes a solid polymer electrolyte membrane, an anode catalyst layer assembled to one surface of the solid polymer electrolyte membrane, and a cathode catalyst layer assembled to another surface of the solid polymer electrolyte membrane. The membrane electrode assembly contains cerium ions. The membrane electrode assembly includes a power-generation region and a non-power-generation region. The power-generation region includes the catalyst layers on both surfaces of the solid polymer electrolyte membrane in a center portion. The non-power-generation region is without the catalyst layer on at least one surface of the solid polymer electrolyte membrane in an outer periphery portion. A cerium ion content per area in the power-generation region is larger than a cerium ion content per area in the non-power-generation region.

Membrane electrode assembly and solid polymer fuel cell

An electrode catalyst and a method for producing the electrode catalyst are described, in which the electrode catalyst includes catalyst metal particles containing platinum or a platinum alloy, and carrier particles supporting the catalyst metal particles. The carrier particles are made of a carbonaceous material with a BET specific surface area of 700 m/g or more. The catalyst metal particles have an average particle size of 2.5 to 4.5 nm, and a standard deviation of the particle size of the catalyst metal particles is 1.30 nm or less. The electrode catalyst has a high initial activity and is able to maintain that activity over a long period of time.

Electrode catalyst for fuel cell and method of production of same

Provided are an electrode for fuel cell including a support with improved durability and capable of suppressing poisoning of catalyst particles by ionomer, and a method for manufacturing the same. The method at least includes: performing heat treatment of a support made of mesoporous carbon having a crystallite diameter Lc at 002 plane that is 1.5 nm or less, at 1,700&#xb0; C. or more and less than 2,300&#xb0; C.; supporting catalyst particles at least inside of the support subjected to the heat treatment; and applying ionomer to the support supporting the catalyst particles for coating.

Electrode for fuel cell and method for manufacturing 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

Growing community of inventors

Nagoya, Japan

Mikihiro Hori