Nippon Steel Chemical & Material Co., Ltd.

Nippon Steel Sumitomo Metal Corporation

Nippon Steel & Sumikin Chemical Co., Ltd.

Silicio Ferrosolar S.l.

Nippon Steel Corporation

Masataka Hiyoshi

Takashi Iijima

Hiroyuki Hayashida

Shinya Furukawa

Kenichiro Tadokoro

Kazuhiko Mizuuchi

Katsumasa Matsumoto

Tomoko Komura

Kazuyoshi Masaki

Takumi Kouno

Wakana Tada

Noriyuki Negi

Masakazu Katayama

Masakazu Higuchi

Takumi Nishimoto

Jiro Kondo

Hitoshi Dohnomae

Shinji Tokumaru

Yutaka Kishida

Kozo Onoue

Shigeru Nakazawa

Nobuyuki Nishi

A carbon material for use as a catalyst carrier for a polymer electrolyte fuel cell which is a porous carbon material and satisfies at the same time (1) the content of a crystallized material is 1.6 or less, (2) the BET specific surface area obtained by a BET analysis of a nitrogen gas adsorption isotherm is from 400 to 1500 m/g, (3) the cumulative pore volume Vwith respect to a pore diameter of from 2 to 10 nm obtained by an analysis of a nitrogen gas adsorption isotherm using the Dollimore-Heal method is from 0.4 to 1.5 mL/g, and (4) the nitrogen gas adsorption amount Vbetween a relative pressure of 0.95 and 0.99 in a nitrogen gas adsorption isotherm is from 300 to 1200 cc (STP)/g, and the method of producing the same.

Carbon material for use as catalyst carrier of polymer electrolyte fuel cell and method of producing the same

Provided are a carbon material for a catalyst carrier of a polymer electrolyte fuel cell, the carbon material being a porous carbon material and simultaneously satisfying (1) an intensity ratio (I/I) of an intensity at 750° C. (I) and a peak intensity in a vicinity of 690° C. (I) is 0.10 or less; (2) a BET specific surface area is from 400 to 1,500 m/g; (3) an integrated pore volume Vof a pore diameter of from 2 to 10 nm is from 0.4 to 1.5 mL/g; and (4) a nitrogen gas adsorption amount Vat a relative pressure of from 0.95 to 0.99 in the nitrogen gas adsorption isotherm is from 300 to 1,200 cc(STP)/g, as well as a method of producing the same.

Carbon material for catalyst carrier of polymer electrolyte fuel cell and method of producing the same

A support for a polymer electrolyte fuel cell catalyst satisfying the following requirements (A), (B), (C), and (D), and a producing method thereof, as well as a catalyst layer for a polymer electrolyte fuel cell and a fuel cell: (A) a specific surface area according to a BET analysis of a nitrogen adsorption isotherm is from 450 to 1500 m/g. (B) a nitrogen adsorption and desorption isotherm forms a hysteresis loop in a range of relative pressure P/Pof more than 0.47 but not more than 0.90, and a hysteresis loop area &#x394;Sis from 1 to 35 mL/g; (C) a relative pressure P/Pat which the hysteresis loop closes is more than 0.47 but not more than 0.70; and (D) a half-width of a G band detected by Raman spectrometry in a range of from 1500 to 1700 cmis from 45 to 75 cm.

Support for polymer electrolyte fuel cell catalyst, method of producing support for polymer electrolyte fuel cell catalyst, catalyst layer for polymer electrolyte fuel cell, and fuel cell

The present invention is a carbon material for a catalyst carrier of a polymer electrolyte fuel cell, which has a three-dimensional dendritic structure, and simultaneously satisfies the following (A), (B), and (C). (A) By a laser Raman spectroscopic analysis with a wavelength of 532 nm, a standard deviation &#x3b4;(R) of an intensity ratio (R value) of an intensity of a D-band (near 1360 cm) to an intensity of a G-band (near 1580 cm) measured with a beam diameter of 1 &#x3bc;m at 50 measurement points is from 0.01 to 0.07. (B) A BET specific surface area Sis from 400 to 1520 m/g. (C) A nitrogen gas adsorption amount Vduring a relative pressure (p/p) from 0.4 to 0.8 is from 100 to 300 cc(STP)/g. A method of producing such a carbon material for a catalyst carrier is also included.

Carbon material for catalyst carrier of polymer electrolyte fuel cell, and method of producing the same

A carbon material for catalyst carrier use excellent in both durability and power generation performance under operating conditions at the time of low humidity, in particular both durability of a carbon material for catalyst carrier use with respect to repeated load fluctuations due to startup and shutdown and power generation performance under operating conditions at the time of low humidity, and a catalyst for solid-polymer fuel cell use prepared using the same etc. are provided. To solve this technical problem, according to one aspect of the present invention, there is provided a carbon material for catalyst carrier use satisfying the following (A) to (D):

Catalyst-carrier carbon material, solid-polymer fuel cell catalyst, solid-polymer fuel cell, and method for manufacturing catalyst-carrier carbon material

Provided are: a method for manufacturing a highly pure silicon by unidirectional solidification of molten silicon, that can inexpensively and industrially easily manufacture highly pure silicon that has a low oxygen concentration and low carbon concentration and is suitable for applications such as manufacturing solar cells; highly pure silicon obtained by this method; and silicon raw material for manufacturing highly pure silicon. A method for manufacturing highly pure silicon using molten silicon containing 100 to 1000 ppmw of carbon and 0.5 to 2000 ppmw of germanium as the raw material when manufacturing highly pure silicon by unidirectionally solidifying molten silicon raw material in a casting container, the highly pure silicon obtained by this method, and the silicon raw material for manufacturing the highly pure silicon.

Method for manufacturing highly pure silicon, highly pure silicon obtained by this method, and silicon raw material for manufacturing highly pure silicon

A support carbon material able to support a catalyst metal in a highly dispersed state and resistant to the flooding phenomenon and with little voltage drop even at the time of large current power generation under high humidity conditions and a catalyst using the same, specifically, a support carbon material for solid polymer type fuel cell use comprised of a porous carbon material which has a pore volume and a pore area found by the BJH analysis method from a nitrogen adsorption isotherm in an adsorption process of a radius 2 nm to 50 nm pore volume Vof 1 ml/g to 5 ml/g and a radius 2 nm to 50 nm pore area Sof 300 m/g to 1500 m/g and a ratio (V/V) of radius 5 nm to 25 nm pore volume V(ml/g) to said pore volume V(ml/g) of 0.4 to 0.7 and a ratio (V/V) of radius 2 nm to 5 nm pore volume V(ml/g) to the same of 0.2 to 0.5 and a catalyst using the same.

Support carbon material and catalyst for solid polymer type fuel cell use

Provided are: a supporting carbon material for a solid polymer fuel cell, said supporting carbon material making it possible to produce a high-performance solid polymer fuel cell in which there is little decrease in power generation performance as a result of repeated battery load fluctuation that inevitably occurs during operation of the solid polymer fuel cell; and a catalyst metal particle-supporting carbon material. The present invention relates to: a supporting carbon material for a solid polymer fuel cell, said supporting carbon material being a porous carbon material in which the specific surface area of mesopores having a pore diameter of 2-50 nm according to nitrogen adsorption measurement is 600-1,600 m/g, the relative intensity ratio (IG'/IG) of the peak intensity (IG&#x2032;) of the G-band 2,650-2,700 cmrange to the peak intensity (IG) of the G-band 1,550-1,650 cmrange in the Raman spectrum is 0.8-2.2, and the peak position of the G&#x2032;-band is 2,660-2,670 cm; and a catalyst metal particle-supporting carbon material.

Supporting carbon material for solid polymer fuel cell and catalyst metal particle-supporting carbon material

Provided are a supporting carbon material for a solid polymer fuel cell and a metal-catalyst-particle-supporting carbon material that, when used as a carrier for a solid polymer fuel cell catalyst, have excellent power generation performance in high-humidity conditions, which are conditions in which solid polymer fuel cells are operated. A supporting carbon material for a solid polymer fuel cell and a metal-catalyst-particle-supporting carbon material characterized in being a porous carbon material, the hydrogen content being 0.004-0.010% by mass, the nitrogen adsorption BET specific surface area being 600 m/g-1500 m/g, and the relative intensity ratio (I/I) between the peak intensity (I) in the range of 1200-1400 cmknown as the D-band and the peak intensity (I) in the range of 1500-1700 cmknown as the G-band, obtained from the Raman spectrum, being 1.0-2.0.

Carbon support material for solid polymer type fuel cell use and metal catalyst particle- supporting carbon material and methods of production of same

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Tokyo, Japan

Masataka Hiyoshi