Nissan Motor Company Limited

Nippon Steel & Sumikin Chemical Co., Ltd.

Tanaka Kikinzoku Kogyo K.k.

Toyo Tanso Co., Ltd.

Nippon Steel Chemical & Material Co., Ltd.

Ken Akizuki

Hiroyuki Tanaka

Atsushi Ohma

Tetsuya Mashio

Yoshitaka Ono

Shinichi Takahashi

Yoshihisa Furuya

Koichi Matsutani

Norifumi Horibe

Takahiro Morishita

Kenichi Toyoshima

Hiroshi Iden

Yoshio Shodai

Kei Sakai

Kazuyuki Satou

Provided is a catalyst having excellent gas transportability. Disclosed is a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein the catalyst includes pores having a radius of less than 1 nm and pores having a radius of 1 nm or more, wherein a pore volume of the pores having a radius of less than 1 nm is 0.3 cc/g support or more or a mode radius of a pore distribution of the pores having a radius of less than 1 nm is 0.3 nm or more and less than 1 nm, and wherein the catalyst metal is supported inside the pores having a radius of 1 nm or more.

Catalyst and electrode catalyst layer, membrane electrode assembly, and fuel cell using the catalyst

[Object] Provided is a catalyst having a high catalytic activity. [Solving Means] Disclosed is a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein the catalyst support includes pores having a radius of less than 1 nm and pores having a radius of 1 nm or more, a surface area formed by the pores having a radius of less than 1 nm is equal to or larger than a surface area formed by the pores having a radius of 1 nm or more, and an average particle diameter of the catalyst metal is 2.8 nm or more.

Catalyst and manufacturing method thereof, and electrode catalyst layer using the catalyst

[Object] Provided is a catalyst having excellent gas transportability. [Solving Means] Disclosed is a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein the catalyst includes pores having a radius of less than 1 nm and pores having a radius of 1 nm or more, wherein a pore volume of the pores having a radius of less than 1 nm is 0.3 cc/g support or more or a mode radius of a pore distribution of the pores having a radius of less than 1 nm is 0.3 nm or more and less than 1 nm, and wherein the catalyst metal is supported inside the pores having a radius of 1 nm or more.

The present invention is to provide a carbon powder that can provide a catalyst having excellent durability and a catalyst. A carbon powder for catalyst of the present invention is a carbon powder containing as a main component carbon, which has a BET specific surface area per unit weight of 900 m/g or greater, and a ratio R' (D&#x2032;/G intensity ratio) of peak intensity for a D&#x2032;-band (D&#x2032; intensity) measured in the vicinity of 1620 cmto peak intensity for a G-band (G intensity) measured in the vicinity of 1580 cmby Raman spectroscopy of 0.6 or less.

Carbon powder for catalyst, catalyst, electrode catalyst layer, membrane electrode assembly, and fuel cell using the carbon powder

The present invention has an object to provide a catalyst having excellent oxygen reduction reaction activity. The present invention relates to a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein a specific surface area of the catalyst per support weight is 715 m/g support or more or a covering ratio of the catalyst metal with an electrolyte is less than 0.5, and an amount of an acidic group of the catalyst per support weight is 0.75 mmol/g support or less.

A fuel cell electrode catalyst layer () of the preset invention includes: a catalyst (); a support () that supports the catalyst; and two or more proton-conductive materials () different in dry mass value per mole of a proton-donating group, the proton-conductive materials being in contact with at least a part of the catalyst and at least a part of the support. Then, a proton-conductive material in which a dry mass value per mole of the proton-donating group is highest among the proton-conductive materials is in contact with at least a part of the catalyst, and has a largest contact ratio with a surface of the catalyst.

Fuel cell electrode catalyst layer, fuel cell electrode, fuel cell membrane electrode assembly and fuel cell having a proton-conductive material coated on a catalyst thereof

Provided is an electrocatalyst for solid polymer fuel cells capable of increasing the active surface area for reactions in a catalyst component, increasing the utilization efficiency of the catalyst, and reducing the amount of expensive precious metal catalyst used. Also provided are a membrane electrode assembly that uses this electrocatalyst and a solid polymer fuel cell. An electrocatalyst for a solid polymer fuel cell is provided with a catalyst and solid proton conducting material. A liquid conductive material retention part that retains a liquid proton conducting material that connects the catalyst and solid proton conducting material is provided between the same. The surface area of the catalyst exposed within the liquid conductive material retention part is larger than the surface area of the catalyst in contact with the solid proton conducting material.

Growing community of inventors

Nishitokyo, Japan

Ken Akizuki