Abstract: A membrane-electrode-assembly contains two or more types of solid polymer electrolytes having different acid dissociation constants in an electrode catalyst layer, a solid polymer electrolyte of small acid strength covers the surface of a catalyst, and a solid polymer electrolyte of large acid strength is disposed to the periphery thereof, which makes the resistance to dissolving of the catalyst metal and the ion conductivity in the catalyst electrode layer compatible.

Abstract: The membrane electrode assembly includes an anode including a catalyst and a solid polymer electrolyte; a cathode including a catalyst and a solid polymer electrolyte; a solid polymer electrolyte membrane interposed between the anode and the cathode; an anode gas diffusion layer; and a cathode gas diffusion layer, a set composed of the anode, the cathode and the solid polymer electrolyte membrane being interposed between the anode gas diffusion layer and the cathode gas diffusion layer, wherein the cathode gas diffusion layer contains an oxidation catalyst and a water-repellent resin.

Abstract: A membrane electrode assembly for a fuel cell comprises a solid polymer electrolyte membrane, an anode being formed on one side of the solid polymer electrolyte membrane and containing a catalyst and a solid polymer electrolyte, a cathode being formed on another side of the solid polymer electrolyte membrane and containing a catalyst and a solid polymer electrolyte, an anode gas diffusion layer formed on one side of the anode, and a cathode gas diffusion layer formed on one side of the cathode. In addition, a formic acid oxidation electrode containing palladium and a solid polymer electrolyte is formed between the anode gas diffusion layer and the anode.

Abstract: Disclosed is a fuel cell in which a membrane electrode assembly less undergoes increase in ion conduction resistance, and a polymer electrolyte membrane less undergoes deterioration. Specifically, the polymer electrolyte membrane includes a first membrane and a second membrane being two different membranes composed of polymer electrolytes having different ion-exchange capacities, in which the first membrane has an area of one surface thereof equal to or larger than an area of one surface of an anode or a cathode, and the second membrane has an area of one surface thereof smaller than that of the first membrane and is arranged in a gas inflow region on a side being in contact with the cathode. The second membrane has an ion-exchange capacity smaller than that of the first membrane or has a number-average molecular weight larger than that of the first membrane.

Abstract: The invention provides an electrode catalyst material in which a resistance loss is reduced by enhancing an electric conductivity as a whole of an electrode catalyst as well as suppressing a corrosion and a disappearance by a catalyst metal in a conductive catalyst support so as to prevent a dropout and an aggregation of a catalyst metal particle, and a method of manufacturing the same. The electrode catalyst material in accordance with the present invention is an electrode catalyst material for a fuel cell having a catalyst metal particle and a carbon support supporting the catalyst metal particle, in which a carbon support protection layer including a metal element is formed in a coating manner on a surface of the carbon support, a silicone is included at 20 atomic % or more in the metal element contained in the carbon support protection layer, and the silicone exists in a state of an oxide and a carbide.

Abstract: In a membrane-electrode assembly comprising an anode, a cathode and a polymer electrolyte membrane and having a constitution in which the polymer electrolyte membrane is interleaved between the anode and the cathode, an agglomerate structure of carbon support formed with a plurality of carbon primary particles supporting catalyst particles is contained in the anode and the cathode, and particulate media having polymer electrolyte on the surface thereof are contained between adjacent agglomerate structures of carbon supports.

Abstract: A fuel cell power system and an operating method thereof are proposed in which, the power generation performance of the fuel cell is effectively recovered in a short period of time without additionally requiring any reducing agent or an inactive gas and while minimizing the degradation of the catalyst in use. The fuel cell power system includes a fuel cell stack in which a plurality of cells each having a membrane electrode assembly and a separator are stacked and a secondary battery which can be charged by power generated by the fuel cell stack. The fuel cell power system can supply power from either the fuel cell stack or the secondary battery to an external device. The fuel cell power system is provided with a power generation cell connection/disconnection mechanism for individually connecting and disconnecting a conductor for electrical conduction between the anode and cathode of each cell included in the fuel cell stack which controlled by a control unit.

Abstract: An object of the present invention is to provide a membrane electrode assembly for a fuel cell that influences less system efficiency of the fuel cell and reduces the amount of emission of hazardous materials for a long period of time. The membrane electrode assembly comprises an anode including a catalyst and a solid polymer electrolyte; a cathode including a catalyst and a solid polymer electrolyte; a solid polymer electrolyte membrane interposed between the anode and the cathode; an anode gas diffusion layer; and a cathode gas diffusion layer, a set composed of the anode, the cathode and the solid polymer electrolyte membrane being interposed between the anode gas diffusion layer and the cathode gas diffusion layer, wherein the cathode gas diffusion layer contains an oxidation catalyst and a water-repellent resin.

Abstract: There is provided a composite catalyst in which metal particles having catalytic activity are supported at a high density on a surface of an inorganic oxide, and the supported metal particles are strongly fixed to the surface of the inorganic oxide to improve the durability of the composite catalyst. The composite catalyst includes the inorganic oxide and the metal particles. A compound having a functional group including an amino group or a thiol group is bonded to a surface of the inorganic oxide. The metal particles are bonded to the functional group.

Abstract: The present invention provides a method of preventing liquid fuel that has penetrated from an anode from reaching a cathode and of effectively utilizing a cathode catalyst, which provides a membrane electrode assembly for fuel cell having high output density. In a membrane electrode assembly for fuel cell including an anode formed of a catalyst and a solid polymer electrolyte, a cathode formed of a catalyst and a solid polymer electrolyte, and a solid polymer electrolyte membrane formed between the anode and the cathode, an intermediate layer is formed between the cathode and the electrolyte membrane.