Nisshin Steel Co., Ltd.

Nippon Steel Chemical & Material Co., Ltd.

Nippon Steel Nisshin Co., Ltd.

Ns Wheeling-nisshin, Inc.

Nippon Steel Sumitomo Metal Corporation

Nippon Steel & Sumikin Chemical Co., Ltd.

Nippon Steel Corporation

Shinya Furukawa

Takashi Iijima

Masataka Hiyoshi

Hiroyuki Hayashida

Kenichiro Tadokoro

Hirofumi Taketsu

Tomoko Komura

Kazuyoshi Masaki

Yasunori Hattori

Wakana Tada

Koutarou Ishii

Masaya Yamamoto

Noriyuki Negi

Yukio Uchida

Kazuhiko Mizuuchi

Katsumasa Matsumoto

Shinichi Koga

Shigeyasu Morikawa

Patrick Edward Pendleton

Mitsuo Asabuki

Takumi Nishimoto

Takumi Kouno

Tetsuhiko Okano

Kazuhiro Yamada

Junichi Okamoto

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

Provided is a hot-dip aluminized steel sheet with fine-sized spangles produced in a different way from conventional methods, and a method of producing a hot-dip aluminized steel sheet with fine-sized spangles in a different way from conventional methods. The hot-dip aluminized steel sheet includes: a substrate steel sheet; and an aluminum-based coating which is formed by a hot-dip method on the surface of the substrate steel sheet and in which the average B concentration is not less than 0.005 mass % and the sum of the average Ti concentration and the average V concentration is not more than 0.03 mass %.

Hot-dip aluminized steel strip and method of producing the same

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 hot-dip coating equipment includes a cooling rate determining device that includes: a coefficient obtaining section configured to obtain coefficients &#x3b1;, &#x3b2;, &#x3b3;, and &#x3b4; associated with the hot-dip coating bath, in the following equation that expresses a degree of discoloration YI of the surface of a hot-dip coated steel sheet; and a rate determining section configured to determine an average cooling rate A so as to allow the YI of the following Expression (1) to be not more than a predetermined reference value, YI =(&#x3b1;&#xd7;[SE]+&#x3b2;)&#xd7;{(T&#x2212;ST)/A}+&#x3b3;&#xd7;[SE]+&#x3b4; . . . (1), where: [SE] is a concentration (mass %) of a specific element contained in the hot-dip coating bath; T is a temperature (&#xb0; C.) of the hot-dip coating bath; and ST is a solidification temperature (&#xb0; C.) at which the hot-dip coating bath is solidified.

Hot-dip coating equipment including cooling rate determining device, and information processing program

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 is (i) a hot-dip Al-based alloy-coated steel sheet which includes a coated layer having a surface on which fine spangles are stably and sufficiently formed and which has a beautiful surface appearance due to the fine spangles thus formed on the surface of the coated layer, and (ii) a method of producing such a hot-dip Al-based alloy-coated steel sheet. The hot-dip Al-based alloy-coated steel sheet includes: a substrate steel sheet; and a hot-dip aluminum-based alloy coated layer which is formed on a surface of the substrate steel sheet and which contains boron at an average concentration of not less than 0.005 mass % and contains potassium at an average concentration of not less than 0.0004 mass %.

Hot-dip Al-plated steel sheet and method for producing same

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

A chemically processed steel sheet comprises a steel base coated with an Al&#x2014;Si alloy plating layer, whose Si content is preferably adjusted to 5&#x2013;13 mass % as a whole and to 7&#x2013;80 mass % at a surface, and a converted layer generated on the surface of the plating layer. The converted layer contains both soluble and scarcely-soluble compounds. The soluble compound, such as a manganese oxide or hydroxide, or a valve metal fluoride, is once dissolved into water in an atmosphere and then re-precipitated as scarcely-soluble compounds at defective parts of the converted layer. The scarcely-soluble compounds act as a barrier for corrosion prevention of a base steel. Due to the re-precipitation, i.e., self-repairing faculty, excellent corrosion resistance of the converted layer is still maintained even after defects are introduced therein during plastic deformation of the steel sheet.

Chemically processed steel sheet excellent in corrosion resistance

A chemically processed steel sheet comprising a steel base coated with an Al&mdash;Si alloy plating layer, whose Si content is preferably adjusted to approximately 5-13 mass % as a whole and to approximately 7-80 mass % at a surface, and a converted layer generated on the surface of the plating layer. The converted layer contains both soluble and scarcely-soluble compounds. The soluble compound such as a manganese oxide or hydroxide or a valve metal fluoride is once dissolved to water in an atmosphere and then re-precipitated as scarcely-soluble compounds at defective parts of the converted layer. The scarcely-soluble compounds act as a barrier for corrosion-prevention of a base steel. Due to the re-precipitation, that is self-repairing faculty, excellent corrosion resistance of the converted layer is still maintained even after defects are introduced therein during plastic deformation of the steel sheet.

In a chromating solution comprising a water-soluble chromium compound and a reducing agent and in which hexavalent chromium ions produced by dissolution of the water-soluble chromium compound have been partly reduced with the reducing agent to trivalent chromium ions, an oxycarboxylic acid compound is used as the reducing agent. This chromating solution causes neither gelation nor sedimentation of the solution even when hexavalent chromium ions are reduced to trivalent chromium ions at a reduction percentage of more than 50%. The chromating solution and a chromate film formed on a steel sheet may also contain an organic resin, phosphoric acid or a phosphoric acid compound, or a silica sol.

Growing community of inventors

Tokyo, Japan

Shinya Furukawa