Nippon Steel Sumitomo Metal Corporation

Nippon Steel Chemical & Material Co., Ltd.

Nippon Steel & Sumikin Chemical Co., Ltd.

Nec Corporation

The Furukawa Electric Co., Ltd.

Nippon Steel & Sumikin Materials Co., Ltd.

Nippon Steel Corporation

Takashi Iijima

Atsushi Kimura

Kenichiro Tadokoro

Masataka Hiyoshi

Hiroyuki Hayashida

Shinya Furukawa

Kazuhiko Mizuuchi

Tomoko Komura

Kazuyoshi Masaki

Wakana Tada

Noriyuki Negi

Yuichi Watanabe

Toshiyuki Sato

Noriyasu Iwane

Kazumi Mizukami

Koji Fujimura

Hideaki Sawada

Takumi Nishimoto

Shinkichi Murakami

Fumikazu Iwahana

Katsumasa Matsumoto

Takumi Kouno

Masakazu Katayama

Masakazu Higuchi

Yoichi Matsuzaki

Jun Nakatsuka

Kenichi Uemura

Hiroshi Kajiro

Tomohiro Hada

Eiki Tsushima

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

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

A fuel cell comprised of a proton conductive electrolyte film sandwiched between a pair of catalyst layers, wherein the catalyst layer of at least the cathode is comprised of a mixture including a catalyst ingredient, an electrolytic material, and a carbon material, the carbon material is comprised of a catalyst-carrying carbon material carrying the catalyst ingredient and a gas-diffusing carbon material not carrying the catalyst ingredient, and the catalyst-carrying carbon material has an amount of adsorption of water vapor at 25&#xb0; C. and a relative humidity of 90% of 50 ml/g or more.

Fuel cell and fuel cell use gas diffusion electrode

The present invention relates to a fuel cell exhibiting a high performance regardless of the humidification conditions. In short, it is a fuel cell comprised of a proton-conducting electrolyte membrane sandwiched between a pair of catalyst layers, wherein a catalyst layer of at least a cathode contains a catalyst ingredient, electrolyte material, and carbon material; the carbon material is comprised of three types of materials of a catalyst-supporting carbon material supporting the catalyst ingredient, a conductivity-aiding carbon material not supporting the catalyst ingredient, and a gas-diffusing carbon material not supporting the catalyst ingredient; the catalyst layer is comprised of two phases of a catalyst aggregated phase having the catalyst-supporting carbon material supporting the catalyst ingredient and the conductivity-aiding carbon material not supporting the catalyst ingredient aggregated as main ingredients and a gas-diffusing carbon material aggregated phase having the gas-diffusing carbon material not supporting the catalyst ingredient aggregated as a main ingredient; and the catalyst aggregated phase is a continuous phase while the gas-diffusing carbon material aggregated phase is dispersed in the catalyst aggregated phase.

Fuel cell

A thin-plate-like flexible carbon plate having flexibility, excellent compressive strength, and even electrical conductivity is provided. A carbon plateis a carbon plate having a thickness of 0.05 to 2.0 mm obtained by compression molding of a mixture of (a) 97 to 80 wt % carbon powder composed of 95 to 30 wt % expanded graphite powder and 5 to 70 wt % graphite powder, and (b) 3 to 20 wt % phenolic resin that do not contain ammonia, wherein a compressive strength is 3 MPa or more, a bending strain is 0.6% or more without a crack, and a contact resistance is 6 m&#x3a9;&#xb7;cmor less.

Carbon plate and composite carbon plate

The present invention has as its object the provision of a solid polymer fuel cell catalyst exhibiting high durability and high power generation performance regardless of the humidification conditions or load conditions. The present invention relates to a solid polymer type fuel cell catalyst which is comprised of a carbon material which carries a catalyst ingredient, wherein the amount of adsorption of water vapor (V) at 25&#xb0; C. and a relative humidity of 10% of the carbon material is 2 ml/g or less and the amount of adsorption of water vapor (V) at 25&#xb0; C. and a relative humidity of 90% of the carbon material is 400 ml/g or more.

Solid polymer type fuel cell catalyst, solid polymer type fuel cell electrode, and fuel cell

A power supply apparatus includes a diode that is disposed in the path of a main current that is a subject of power control. The diode includes a substrate; a gallium-nitride buffer layer formed on the substrate; a gallium-nitride layer formed on the gallium-nitride buffer layer; and an n-type aluminum-gallium-nitride layer formed on the gallium-nitride layer.

Apparatus and circuit for power supply, and apparatus for controlling large current load

An imaging area has a substrate with a mosaic of photo diodes arranged in rows and columns on a solid state substrate. Vertical shift registers are positioned between the columns to transfer photo charges out of the photo diodes and to associated electronic circuits. Depletion layers are interposed in said substrate to separate it into areas. Pulses are applied to the depletion layers driving the transfer periods in order to prevent charge overflow, and therefore a smearing of the image.

Driving method of solid-state imaging device for improving smear

A frequency divider for dividing input pulses by a predetermined number is formed of an input means for receiving input pulses, a plural number of counters, each having a series connection of stages through which a count signal is respectively shifted in response to the input pulses. The numbers of series stages being selected so that they do not have any common divisor and have a minimum common multiple larger than the predetermined number pulse one. The frequency divider also includes a detecting means for detecting common occurrence of said count signals at selected stages of respective counters, and an output means for producing an output pulse in response to the detection by the detecting means.

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Tokyo, Japan

Takashi Iijima