Abstract: The present invention provides a method for manufacturing a membrane-electrode assembly (MEA) which is a core element of a polymer electrolyte membrane fuel cell for a vehicle and an electrode therefor. The method for manufacturing an MEA of the present invention is implemented to provide a highly-concentrated catalyst slurry which is uniformly dispersed, compared to conventional catalyst slurries, by a catalyst slurry manufacturing process including a vacuum defoaming process.

Abstract: The present invention relates to a method for manufacturing catalyst layer of membrane electrode assembly MEA. More particularly, the present invention relates to a method manufacturing for catalyst layer of MEA, which can improve performance of the MEA by separating the two substances that consist of the catalyst layer according to the density differences.

Abstract: The present invention relates to a method of activating membrane electrode assemblies of polymer electrolyte membrane fuel cells of a fuel cell stack for a vehicle comprising: supplying a humidified gas to a fuel cell so as to hydrate an electrolyte membrane and an electrolyte of electrodes of the fuel cell; and performing a cyclic voltammetry process so as to activate the layers of the electrodes.

Abstract: A method of filling a trench includes: providing a substrate having an upper surface, and a trench extending therein from the upper surface; forming a deposition layer on the substrate in a manner in which the layer partially fills the trench and has a portion which overhangs the trench at the upper surface of the substrate; etching, in a processing chamber, the portion of the deposition layer which overhangs the trench, including by inducing a reaction in the processing chamber using plasma; and subsequently depositing material on the substrate within the partially filled trench, including by inducing a reaction in the processing chamber using plasma.

Abstract: The present invention provides a method of manufacturing a membrane-electrode assembly for a fuel cell, in which a binder is spray-coated on a surface of a polymer film, a catalyst slurry is bar-coated on a surface of an electrolyte membrane, bonded on the binder, to form a catalyst electrode layer, a bonded assembly of the electrolyte membrane and the catalyst electrode layer is separated from the polymer film, after a drying process, to obtain a 2-layer MEA, and the thus obtained 2-layer MEAs are used to form a 3-layer MEA or a 5-layer MEA by a hot pressing process. Accordingly, the present methods solve the problems associated with prior art that the loss of catalyst is considerable, since the catalyst slurry is directly spray-coated on the membrane, and the catalyst electrode layer in a solid phase is hot-pressed on both surfaces of the membrane.

Abstract: The membrane-electrode assembly includes: a high intensity film with a shape of a porous thin plate having a high intensity; an electrolyte solution which is impregnated into the high intensity film by applying heat and pressure in a state of being sprayed on the high intensity film, thereby forming a high intensity complex membrane; porous catalyst electrode layers which are respectively coupled on both sides of the high intensity film which is impregnated with the electrolyte solution, precious metal being sprayed thereon; and gas diffusion layers which are respectively coupled on both outer sides of the catalyst electrode layer so as to support the catalyst electrode layer 120 and to evenly diffuse fuel gas.

Abstract: The membrane-electrode assembly includes: a porous first catalyst electrode layer; a first gas diffusion layer which is coupled to a lower surface of the first catalyst electrode layer; a porous second catalyst electrode layer which is coupled to an upper surface of the first catalyst electrode layer; a conductive electrolyte solution which is coated with constant thickness between the first catalyst electrode layer and the second catalyst electrode layer and permeates into the first catalyst electrode layer and the second catalyst electrode layer, solvent thereof being evaporated so that a phase thereof is changed to a solid state so as to be closely attached to the first catalyst electrode layer and the second catalyst electrode layer, thereby forming the electrolyte membrane; and a second gas diffusion layer which is coupled to an upper surface of the second catalyst electrode layer.