Abstract:
A catalyst for a low temperature fuel cell is provided to maximize the efficiency while increasing the surface area of the dipped platinum catalyst, and to reduce noble metals. A catalyst for a low temperature fuel cell comprises a support and a catalyst. The support is fiber-like nano carbon of highly effective surface area, having the specific surface area measured with a nitrogen BET method of 100 m^2/g or more. The fiber-like nano carbon of highly effective surface area comprises the steps of: (i) manufacturing a transition metal alloy catalyst containing (a) iron single catalyst through oxidation reaction and reduction reaction and (b) at least one metal elected from the group consisting of nickel, cobalt, copper, and molybdenum; (ii) adding hydrogen gas to the catalyst, and performing reduction reaction to produce minute metals on the surface of the catalyst; and (iii) adding C1-4 saturated and unsaturated gas or the mixed gas consisting of carbon monoxide and hydrogen gas and heat-treating them.
Abstract:
PURPOSE: A high electrical conductive carbon nanofiber and a manufacturing method thereof are provided to increase an electrical conductivity and a contact area with an activated charcoal, and thus an electrode internal resistance and an electrical conductivity increase as well as a capacity increases. CONSTITUTION: A manufacturing method of high electrical conductive carbon nanofiber comprises following steps. A Cu/Ni catalyst is manufactured (S100). Carbon nanofiber is manufactured by using the Cu/Ni catalyst (S200). The carbon nanofiber is acid-processed (S300). The acid-processed carbon nanofiber is thermally decomposed and carbon coated (S400). The carbon coated carbon nanofiber is graphitize-processed (S500). [Reference numerals] (S100) Manufacture Cu/Ni catalyst; (S200) Manufacture carbon nanofiber; (S300) Acid-process carbon nanofiber; (S400) Thermally decompose and coat carbon; (S500) Graphitize-process
Abstract:
본 발명은 ⅰ) 실리콘 분말 또는 실리콘과 전이 금속, 2족, 13족, 14족, 15족 원소에서 선택된 1종 이상의 금속 합금 혼합 분말로 구성된 실리콘계 담지체 분말을 탄소공급원 존재하에 600~1100℃에서 담지체 기재 표면을 비결정성 열분해 탄소로 5~200 ㎚ 두께 및 담지체 중량 대비 3~50 중량% 표면 코팅시키는 단계; ⅱ) 열분해 탄소로 표면 코팅된 실리콘계 담지체 표면에 전이금속 촉매를 분산시키고 탄소공급원 존재 하에서 400~800℃에서 탄소나노섬유를 기상 성장시키는 단계로 제조된 최대 입경 45 ㎛ 이하인 리튬 이차전지용 실리콘계 음극 활물질 복합재를 제공한다. 실리콘, 분말, 전이 금속, 담지체, 탄소공급원, 열분해 탄소, 음극 활물질
Abstract:
PURPOSE: A platelet carbon nanofiber and a manufacturing method thereof are provided to secure the high conductivity when manufacturing an electrode, and to easily disperse fuel and air. CONSTITUTION: A platelet carbon nanofiber has the expect rate(fiber length/fiber diameter rate) of 30~50, and the interplanar distance of a carbon basal plane less than 0.34 nanometers. A manufacturing method of the platelet carbon nanofiber comprises the following steps: reducing a transition metal nitride aqueous solution to form a carbon transition metal corpuscle; drying and oxidizing the outcome to form a carbon nano fiber synthetic catalyst; settling the catalyst to a rotational reactor, and rotating the reactor while applying a carbon source to synthesize the carbon nanofiber.
Abstract:
PURPOSE: A catalyst for fuel cell is provided to have core-shell form and enhance the activity of fuel cell. CONSTITUTION: A catalyst for fuel cell comprises: carbon carrier, transition metal cocatalyst contained in the carbon carrier, and platinum main catalyst formed on the surface of cocatalyst. The cocatalyst is selected from Ru, Pd, Au, Ag, Ir, Os, V, Cr, Mn, Fe, Co, Ni, Cu, Ru, Ir, W, and Mo. A method for preparing the catalyst for fuel cell comprises: a step of dipping a copolymer in a carbon carrier to prepare a cocatalyst support; a step of adding platonic compound solution to the cocatalyst support; and a step of adding reductant to the solution.
Abstract:
본 발명은 나노 로드를 기본 단위구조로 가지는 질소 BET법으로 측정한 비표면적이 100m 2 /g 이상인 고유효 표면적의 섬유상 나노탄소의 담체; 및 촉매로 이루어진 저온연료전지용 촉매, 상기 촉매를 포함하는 저온연료전지용 전극, 및 상기 촉매를 포함하는 저온연료전지를 제공한다. 본 발명의 저온연료전지는 나노 로드를 단위 구조로 가지는 섬유상 나노탄소를 담체로 사용함으로써, 백금 촉매를 담지시킬 수 있는 유효표면적을 증대시켜 담지된 백금촉매의 이용률이 상승된다. 이와 같이 제조된 촉매를 저온연료전지의 연료전지용 전극으로 사용함으로써 귀금속 백금 촉매의 사용량을 20% 이상 감소시켜도 상용촉매의 활성에 상당하거나 능가하는 높은 발전효율의 발현이 가능하므로, 촉매 제조 코스트 저하에 크게 기여할 수 있다. 나노로드, 섬유상 나노탄소, 연료전지, 백금촉매, 촉매담체
Abstract:
본 발명은 탄소재료-탄소나노섬유 복합 소재를 전극 재료로 사용한 전기이중층 캐패시터에 관한 것으로서, 탄소재료의 표면에 탄소나노섬유를 성장시킨 탄소재료-탄소나노섬유 복합 소재를 전극 재료로 사용함으로써 종래 소재와 유사한 체적 용량 및 전극밀도를 유지하면서 전극의 부피팽창율을 대폭 감소시킨 전기이중층 캐패시터를 제공한다. 복합소재, 탄소나노섬유, 가스화, 전극팽창율, 전극밀도
Abstract:
An electric double-layer capacitor using a carbon-based material-carbon nano fiber composite as an electrode is provided to increase a capacity per a volume by restricting a volume expansion rate of the electrode while maintaining a similar capacity and electrode density in charging or discharging. An electric double-layer capacitor uses the carbon-based material-carbon nano fiber composite having changed specific surface area, and diameter and volume of a pore by improving a surface of a carbon nano fiber by growing the carbon nano fiber on a surface of a carbon material. The carbon material has a micro pore of 80% or more having a specific surface area of 100 to 1000 m^2/g and a diameter of 2 nm.