Abstract:
The present invention relates to a fuel mixing tank for a direct methanol fuel cell system having a fuel flow preventing device installed thereon and a direct methanol fuel cell system including the same. The fuel mixing tank of the present invention receives raw liquid methanol fuel, cathode discharged material, and anode discharged material respectively from a fuel tank, a cathode, and an anode and provides the anode with mixed fuel that is made by mixing the same. The fuel mixing tank comprises a top chamber and a bottom chamber that are separated into a top and a bottom by means of a separation plate. The top chamber comprises: a cathode discharged material inlet through which the cathode discharged material is supplied; and a gas outlet through which gas is discharged to the outside. The bottom chamber comprises: an anode discharged material inlet through which the anode discharged material is supplied; a raw liquid methanol inlet through which the raw liquid methanol fuel is supplied from the fuel tank; and a fuel supply hole through which the mixed fuel is supplied to the anode. The separation plate comprises: a water supply channel that is installed as a pipe for penetrating the separation plate in order to have the top disposed in the top chamber and the bottom disposed in the bottom chamber; and a gas transferring unit for transferring the gas in the bottom chamber to the top chamber, wherein a porous flow preventing plate is installed inside the bottom chamber so that the mixed fuel can be moved up and down.
Abstract:
본 발명은 직접 메탄올 연료 전지의 메탄올 크로스오버 현상을 감소시키고 높은 메탄올 농도에서 작동하여도 높은 효율을 나타낼 수 있는 직접 메탄올 연료 전지의 애노드 전극용 촉매, 이를 이용한 직접 메탄올 연료 전지용 막전극 어셈블리 및 직접 메탄올 연료 전지 시스템에 관한 것이다.
Abstract:
PURPOSE: A catalyst for an anode electrode is provided to implement the excellent performance and long term durability in the high methanol concentration and relieve a crossover of the direct methanol fuel cell. CONSTITUTION: A catalyst for an anode electrode of a direct methanol fuel cell includes silica; and the catalytic substance which is dipped in the silica; the catalytic substance comprises one or two kinds which is selected from platinum, ruthenium, osmium, platinum-ruthenium alloy, platinum-osmium alloy, platinum-palladium alloy, platinum-M alloy; the M is a transition metal of more than one kind which is selected from Ga, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sn, Mo, W, Rh, and Ru. The catalyst comprises 50-80 parts by weight of the catalytic substance base on 10-40 parts by weight of the silica.
Abstract:
PURPOSE: A separator for a fuel cell is provided to reduce the total components number of a fuel cell stack and to prevent the defects of a separator and a cover. CONSTITUTION: A separator(200) for a fuel cell comprises: a plate body(10) in which a flow channel(11) is formed for fluid flowing is formed at least one side thereof; manifolds(61-64) supplying fluid to the flow channel and discharging the fluid from the same; and at least one connection path(71-74) which is connected to the flow channel and is formed on the inner circumference of the manifolds for feeding the fluid through a flow channel and discharging the fluid to another manifold.
Abstract:
PURPOSE: A method for manufacturing porous carbon materials with mesopores and a carrier for fuel battery catalyst manufactured by the same are provided to cost effectively mass-produce the carbon materials with uniformly distributed mesopores by using ceramic nanoparticles of adequate diameters as templates. CONSTITUTION: A carbon film is formed on the surfaces of ceramic nanoparticles. The ceramic nanoparticles are mixed with carbon precursors. The mixture of the ceramic nanoparticles and the carbon precursors are thermally treated and carbonized to obtain a resultant product. The ceramic nanoparticles are eliminated from the resultant product. The ceramic nanoparticles are selected from a group including SiO2, Al_2O_3, MgO, CaCO_3, zeolite, alumino silicate, and the mixture of the same. The diameters of the ceramic nanoparticles are in a range between 2 and 100nm.
Abstract:
PURPOSE: A driving method of direct methanol type fuel cell system is provided to recover the performance of the catalyst contaminated by by-product like carbon monoxide through simple method, thereby maintaining the output electricity stably. CONSTITUTION: A driving method of direct methanol type fuel cell system comprises a step of operating a fuel cell system in the state the connection of load and the supply of air and fuel are discontinued for specific time. The direct methanol fuel cell system comprises a stack(100), a mixing tank(110) collecting and storing unreacted fuel and air, a fuel tank(120) supplying fuel to the mixing tank, and a fuel pump(121) supplying mixed fuel to the stack, and a control part(130) operating the system for specific time, and operating the system in the state the connection of load and the supply of air and fuel are discontinued for specific time.
Abstract:
PURPOSE: A driving method of a direct oxidation type fuel cell system at low temperature is provided to activate a fuel cell system without external heating device, thereby improving the energy efficiency of the fuel cell system. CONSTITUTION: A driving method of a direct oxidation type fuel cell system(1) comprises: a step of driving a stack(15) with constant voltage condition, until the temperature is increased to 25-50 °C; and a step of driving the stack in which temperature is increased by previous step, with constant current condition. In the first step, hydrocarbon fuel and oxidizer, of which freezing point are lower than the external temperature are supplied to the stack, and in the second step, hydrocarbon fuel and oxidizer with 1-2 M concentration are supplied to the stack.
Abstract:
PURPOSE: A direct methanol fuel cell including a carbon paper diffusion layer having micropores is provided to maximize the output and efficiency of a battery by rapidly discharging by-products and smoothing the supply of fuel and oxidizing agents by forming micropores on a carbon paper constituting a diffusion layer. CONSTITUTION: A direct methanol fuel cell including a carbon paper diffusion layer having micropores comprises: an electrolyte film in which a catalyst layer and a diffusion layer are successively arranged on one side of the electrolyte film; a fuel electrode to which a methanol solution is supplied as fuel; and an air electrode supplied with oxidation gas in which a catalyst layer and a diffusion layer are successively arranged on the other side of the electrolyte film.
Abstract:
PURPOSE: Porous carbon fiber using MgO and a fuel cell catalyst support using the same are provided to reduce manufacturing costs for the porous carbon fiber, and to simplify a drawing process of the fiber. CONSTITUTION: A manufacturing method of porous carbon fiber having uniform mesopores includes the following steps: dissolving spinning pitch in THF liquid by dispersing MgO powder; sealing, agitating and drying the MgO powder; spinning a mixture with a spinning nozzle; stabilizing the spun fiber in the air; carbonizing the fiber while maintaining the temperature; and drying the carbon fiber in which impurities are removed.