Abstract:
PURPOSE: A method for preparing a membrane-electrode-gasket assembly (MEGA) for a fuel cell and a solid polymer electrode fuel cell(SPEFC) or a direct methanol fuel cell(DMFC) containing the MEGA prepared by the method are provided, to reduce the thickness of an electrolyte membrane for improving the performance of a fuel cell. CONSTITUTION: The method comprises the steps of adhering a polytetrafluoroethylene gasket(2) with a thickness of 30-400 micrometers on the edge of a gas diffusion layer(1); coating a carbon powder layer(3) containing 10-60 wt% of polytetrafluoroethylene on the other part except the adhered gasket of a gas diffusion layer; coating a catalyst ink comprising a polymer electrolyte ionomer, a catalyst and an organic solvent, on the carbon powder layer to form a cathode catalyst layer(4); coating a solid electrolyte ionomer solution on the catalyst layer to form an electrolyte layer(5); coating a catalyst ink comprising a polymer electrolyte ionomer, a catalyst and an organic solvent, on the carbon powder layer to form an anode catalyst layer(4); coating a carbon powder layer(3) containing 10-60 wt% of polytetrafluoroethylene on the anode catalyst layer; and adhering a gas diffusion layer(1) on the carbon powder layer formed on the anode catalyst layer.
Abstract:
본 발명은 전도성 고분자 또는 탄소에 고분자 물질을 첨가한 형태인 탄소 복합체를 주 재질로 하여 분리판을 제조함으로써, 경량화 및 박막화가 가능하고, 부식을 방지할 수 있으며, 나아가 간단한 제조공정으로 제조단가를 저감시킬 수 있는, 전도성 고분자 또는 탄소 복합체 재질의 고분자 전해질 연료 전지용 분리판 제조방법에 관한 것으로, 본 발명에 의한 고분자 전해질 연료 전지용 분리판은, 전도성 고분자 또는 탄소 복합체를 주 재질로 하여 제조되는 고분자 전해질 연료 전지용 분리판으로, 상기 전도성 고분자는 폴리아닐린, 폴리페닐렌, 폴리치에닐렌 비닐렌, 폴리피롤, 폴리페닐렌 비닐렌, 및 폴리아세틸렌로 구성되는 군으로부터 하나 이상 선택된 것이고, 상기 탄소 복합체는 탄소에 페놀수지, 비닐 에스터수지, 에폭시수지, 강화 폴리에스터수지, 및 폴리이미드 수지로 구성되는 고분자 물질군으로부터 하나 이상을 선택하여 첨가시킨 것임을 특징으로 한다.
Abstract:
본 발명은 고분자 전해질 연료전지에 사용되는 막-전극-가스켓 접합체(Membrane-Electrode-Gasket Assembly, MEGA)의 제조방법에 관한 것으로서, 더욱 상세하게는 가스켓과 일체화된 막-전극 접합체(Membrane-Electrode Assembly, MEA)로써 취급이 용이하며, 전극 위에 직접 전해질막을 형성시킴으로써 기존의 상용 전해질막보다 막의 두께를 얇게 하는 것이 가능하게 되어 연료전지의 성능을 향상시킬 수 있고, 또한 일련의 공정으로 제작할 수 있어서 대량생산에 유리한 연료전지용 고성능 막-전극-가스켓 접합체(Membrane-Electrode-Gasket Assembly, MEGA)의 제조 방법에 관한 것이다.
Abstract:
PURPOSE: Provided is a method for producing an electrode being excellent in a hydrogen ion transfer property and activity cell which includes applying a layer of carbon powder on a gas diffusion layer, applying a catalyst ink on the carbon layer to form a catalyst layer; and applying a solution of an ionomer on the catalyst layer. CONSTITUTION: The method comprises steps of (a) applying a layer of carbon powder(22) containing 10 to 50 wt% of polytetrafluoroethylene on a gas diffusion layer(21); (b) applying a catalyst ink on the carbon layer containing a polymer electrolyte ionomer, a catalyst and an organic solvent to form a catalyst layer(23); and (c) applying a solution of polymer electrolyte ionomer dispersed in a hydrophilic solvent on the catalyst layer to form an ionomer layer(24). By this method, an electrode being excellent in hydrogen ion transfer and its activity can be obtained with a small amount of catalyst.
Abstract:
PURPOSE: A polymer electrolyte fuel cell is provided for manufacturing the high reliable unit cell or stack and accomplishing superior gas-sealing effect with no leak of gas by additionally attaching at least one specific gasket to the structure of the fuel cell. CONSTITUTION: The polymer electrolyte fuel cell comprises a plurality of unit cells laminated together and equipped with at least one gasket(2, 4) between a separator plate(1) and the electrolyte-electrolyte membrane assembly(3). The gasket has passages(6-21) for passing gas through at the center part, electrodes at its edge part and a rib having a width of 1-2mm and a thickness of 0.1-0.3mm around the peripheral side of the passage to seal gas stream. The rib(s) is(are) attached to one side or both sides of the gasket.