Tanaka Kikinzoku Kogyo K.k.

Nissan Motor Company Limited

Nippon Steel Chemical & Material Co., Ltd.

Hitoshi Nakajima

Koichi Matsutani

Minoru Ishida

Takeshi Kaieda

Katsuichiro Hayakawa

Hiroyuki Tanaka

Tetsuya Mashio

Kazuki Arihara

Tomoyuki Tada

Wataru Hashimoto

Yoshinori Suzue

Tatsunori Namai

Kazuki Okaya

The present invention relates to a catalyst for a solid polymer fuel cell, including platinum, cobalt, and zirconium supported as a catalytic metal on a carbon powder carrier, in which the supporting ratio of platinum, cobalt, and zirconium on the carbon powder carrier is Pt:Co:Zr=3:0.5 to 1.5:0.1 to 3.0 by molar ratio. In the present invention, it is preferable that the peak position of PtCo seen in the X-ray diffraction pattern of catalyst particles is 2&#x3b8;=41.10&#xb0; or more and 42.00&#xb0; or less, and moderate alloying has occurred in the catalytic metal.

Catalyst for solid polymer fuel cell and method for producing same

Provided is a catalyst that can exhibit high activity. The catalyst is an electrode catalyst having catalytic metals supported on a catalyst support, in which the catalytic metals include platinum and a metal component other than platinum; the electrode catalyst has mesopores having a mode radius of pore distribution of mesopores having a radius of 1 nm or more, of 1 nm or more and less than 2.5 nm; alloy microparticles of platinum and the metal component other than platinum are supported inside the mesopores; and a molar content ratio of platinum with respect to the metal component other than platinum in the alloy microparticles supported inside the mesopores is 1.0 to 10.0.

Electrode catalyst, and membrane electrode assembly and fuel cell using electrode catalyst

Provided is a catalyst for solid polymer fuel cell that exhibits excellent initial activity and favorable durability and a method for manufacturing the same. The invention is a catalyst for solid polymer fuel cell which is formed by supporting catalyst particles including platinum, cobalt and manganese on a carbon powder carrier, wherein a composition ratio (molar ratio) among platinum, cobalt and manganese in the catalyst particles is Pt:Co:Mn=1:0.06 to 0.39:0.04 to 0.33, a peak intensity ratio of a Co&#x2014;Mn alloy appearing in the vicinity of 2&#x3b8;=27&#xb0; is 0.15 or less with respect to a main peak appearing in the vicinity of 2&#x3b8;=40&#xb0; in X-ray diffraction analysis of the catalyst particles, and a fluorine compound having a C&#x2014;F bond is supported at least on the surface of the catalyst particles. The amount of the fluorine compound supported is preferably from 3 to 20% with respect to the entire mass of the catalyst.

Catalyst for solid polymer fuel cell and method for manufacturing the same

The present invention provides a catalyst for a polymer electrolyte fuel cell including catalyst particles made of platinum supported on a carbon powder carrier, wherein the carbon powder carrier includes 0.7 to 3.0 mmol/g (based on the weight of the carrier) of a hydrophilic group bonded thereto; and the platinum particles have an average particle size of 3.5 to 8.0 nm and the platinum specific surface area based on CO adsorption (COMSA) of 40 to 100 m/g. The catalyst for a polymer electrolyte fuel cell according to the present invention is a catalyst excellent in initial activity and satisfactory in durability.

Catalyst for polymer electrolyte fuel cell and method for producing the same

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Kanagawa, Japan

Hitoshi Nakajima