Abstract: A fuel battery includes a membrane-electrode assembly including a first catalyst layer and a first gas diffusion layer stacked on a first surface of a polymer electrolyte membrane, and a second catalyst layer and a second gas diffusion layer stacked on a second surface of the polymer electrolyte membrane. The membrane-electrode assembly is interposed between a first separator and a second separator. The first separator includes a rib and a groove on a surface that is in contact with the first gas diffusion layer, the rib and the groove defining a gas flow path through which a reaction gas is to flow. A thickness of the first gas diffusion layer is defined as h, and a width of a portion of the rib that is in contact with the first gas diffusion layer is defined as Rw such that 0.29 Rw?h?0.55 Rw is satisfied.

Abstract: A membrane electrode assembly for a fuel cell includes a catalyst layer having a first main surface and a second main surface, a gas diffusion layer disposed on a side of the first main surface, and an electrolyte membrane disposed on a side of the second main surface, wherein the gas diffusion layer includes a conductive material and a polymer resin, the conductive material comprises a fibrous carbon material, an average fiber diameter D of the fibrous carbon material is equal to or less than 25% of a thickness T of the catalyst layer, and in a cross section in a thickness direction of the catalyst layer, an arithmetic mean roughness Ra1 of the first main surface and an arithmetic mean roughness Ra2 of the second main surface satisfies the relation, Ra1>Ra2.

Abstract: A fuel battery cell includes: a first separator, a first gas diffusion layer, a first catalyst layer, a polymer electrolyte membrane, a second catalyst layer, a second gas diffusion layer, and a second separator that are sequentially laminated along a laminating direction; a first gas flow path part that is provided between the first separator and the first gas diffusion layer; and a second gas flow path part that is provided between the first separator and the first gas diffusion layer and adjacent to the first gas flow path part in a direction intersecting the laminating direction, and has a flow path area larger than that of the first gas flow path part in a plan view seen along the laminating direction. The first gas diffusion layer includes a first low-elasticity part facing the first gas flow path part, and a first high-elasticity part facing the second gas flow path part and having a higher compressive modulus of elasticity than that of the first low-elasticity part in the laminating direction.

Abstract: A membrane electrode assembly for a fuel cell, the membrane electrode assembly including an electrolyte membrane, and a first electrode and a second electrode sandwiching the electrolyte membrane, wherein the first electrode includes a first catalyst layer and a first gas diffusion layer in order from the electrolyte membrane side, the first gas diffusion layer includes a first fibrous conductive member and a first resin material, the first catalyst layer includes a second fibrous conductive member, catalyst particles, and a second resin material, when viewed from a stacking direction of the membrane electrode assembly, a first angle formed by the first fibrous conductive member and a main flow path of a gas supplied to the membrane electrode assembly is arbitrary, and a second angle formed by the second fibrous conductive member and the main flow path is 45° or less.

Abstract: A membrane-electrode assembly includes an electrolyte membrane, a pair of catalyst layers stacked on surfaces of the electrolyte membrane, and a pair of gas diffusion layers stacked on a side opposite to the electrolyte membrane of one of the pair of catalyst layers and on a side opposite to the electrolyte membrane of the other one of the catalyst layers. One of the pair of catalyst layers contains catalyst particles and a first conductive material. One of the pair of gas diffusion layers in contact with the one of the catalyst layers contains a second conductive material. The first conductive material includes a first particulate conductive member and a first fibrous conductive member, and the second conductive material includes a second fibrous conductive member. The content K2 by mass of the second fibrous conductive member is larger than the content K1 by mass of the first fibrous conductive member.

Abstract: A positive electrode for an air battery includes a current collector and a porous layer including an electroconductive material. The current collector includes a base having a first major surface, and a plurality of projections disposed on at least the first major surface of the base. The first major surface of the base is a planar surface. The porous layer is disposed on the first major surface of the base and is in direct contact with the first major surface. The projections are in direct contact with the porous layer in the interior of the porous layer.

Abstract: A fuel-cell cell capable of reducing elution of particles with a catalytic function into the electrolyte membrane is provided. A fuel-cell cell according to the present disclosure includes an electrolyte membrane, a cathode catalyst layer laminated on a first main surface side of the electrolyte membrane, a cathode gas diffusion layer laminated on the cathode catalyst layer, an anode catalyst layer laminated on a second surface side of the electrolyte membrane, and an anode gas diffusion layer laminated on the anode catalyst layer. The cathode catalyst layer includes a cathode catalyst in which catalyst particles with a catalytic function are carried on a carrier, and the cathode catalyst includes a water-repellent polymer material in at least part of a surface thereof.

Abstract: a fuel battery includes a membrane-electrode assembly (MEA) in which a catalyst layer and a gas diffusion layer are stacked on each of opposite surfaces of a polymer electrolyte membrane; and separators between which the membrane-electrode assembly is interposed, wherein each of the separators includes a rib and a groove on a surface that is in contact with the gas diffusion layer, the rib and the groove forming a gas flow path through which a reaction gas to be used for power generation flows, when a thickness of the gas diffusion layer is defined as h, and a width of a portion of the rib that is in contact with the gas diffusion layer is defined as Rw, 0.29 Rw?h?0.55 Rw is satisfied, the gas diffusion layer includes conductive particles, conductive fibers, and a polymer resin, and average fiber length Fl and average fiber diameter Fd of the conductive fibers satisfy Fl<Rw/2 and Fd<h/100.

Abstract: A gas diffusion layer includes: a conductive particle; and a fluororesin, and the fluororesin includes a first fiber having a first average fiber diameter and a second fiber having a second average fiber diameter different from the first average fiber diameter.

Abstract: A fuel battery cell includes: a first separator, a first gas diffusion layer, a first catalyst layer, a polymer electrolyte membrane, a second catalyst layer, a second gas diffusion layer, and a second separator that are sequentially laminated along a laminating direction; a first gas flow path part that is provided between the first separator and the first gas diffusion layer; and a second gas flow path part that is provided between the first separator and the first gas diffusion layer and adjacent to the first gas flow path part in a direction intersecting the laminating direction, and has a flow path area larger than that of the first gas flow path part in a plan view seen along the laminating direction. The first gas diffusion layer includes a first low-elasticity part facing the first gas flow path part, and a first high-elasticity part facing the second gas flow path part and having a higher compressive modulus of elasticity than that of the first low-elasticity part in the laminating direction.

Abstract: A gas diffusion layer includes conductive particles, conductive fibers, and polymer resins, in which an amount of surface functional groups in the conductive particle is 0.25 mmol/g or less.

Abstract: A fuel cell includes: an electrolyte membrane; a cathode positioned on a first surface of the electrolyte membrane; an anode positioned on a second surface of the electrolyte membrane; a cathode-side sealant positioned on a surface of the cathode different from the electrolyte membrane side of the cathode; an anode-side sealant positioned on a surface of the anode different from the electrolyte membrane side of the anode; a cathode-side separator positioned on a surface of the cathode-side sealant different from the cathode side of the cathode-side sealant; and an anode-side separator positioned on a surface of the anode-side sealant different from the anode side of the anode-side sealant. The anode-side separator has a projection on a surface stacked on the anode-side sealant, or the cathode-side separator has a projection on a surface stacked on the cathode-side sealant.

Abstract: A gas diffusion layer for a fuel battery is used, which is configured by a porous member containing conductive particles, conductive fibers and a polymer resin as main components. An aggregate of the conductive fibers is formed inside the porous member, and an area ratio of the aggregate in any cross-section of the porous member is 0.5% or more and 8% or less. Further, a membrane electrode assembly including the gas diffusion layer for the fuel battery is used. Further, a fuel battery including the gas diffusion layer for the fuel battery is used.

Abstract: A fuel cell includes a pair of separators for clamping a laminate including a membrane electrode assembly, an anode gas diffusion layer, and a cathode gas diffusion layer, and a frame formed from thermosetting resin and disposed between the separators to surround a periphery of the laminate. At least one of the anode and the cathode gas diffusion layers is formed from a composite of thermoplastic resin and conductive particles, and includes a protrusion protruding beyond a level of a surface of the frame which faces one of the separators in a state that the laminate is not clamped between the separators under a predetermined pressure. The one of the separators presses the protrusion and gets the one of the gas diffusion layers to be deformed and put into contact with the frame in a state that the laminate is clamped between the separators under the predetermined pressure.

Abstract: A fuel cell includes: an electrolyte membrane; a fuel-side catalyst layer placed on one surface of the electrolyte membrane; an oxidant-side catalyst layer placed on another surface of the electrolyte membrane; a fuel-side gas-diffusion layer placed on a main surface of the fuel-side catalyst layer; an oxidant-side gas-diffusion layer placed on a main surface of the oxidant-side catalyst layer; a pair of separators that hold the fuel-side gas-diffusion layer and the oxidant-side gas-diffusion layer therebetween; a frame that surrounds outer peripheries of the fuel-side gas-diffusion layer and the oxidant-side gas diffusion layer; a fuel-side seal member placed on a main surface of the fuel-side gas-diffusion layer; and an oxidant-side seal member placed on a main surface of the oxidant-side gas-diffusion layer. In the fuel cell, no spaces are provided between the fuel-side gas-diffusion layer and the fuel-side catalyst layer and between the oxidant-side gas-diffusion layer and the oxidant-side catalyst layer.

Abstract: Disclosed is a gas-diffusion layer used for fuel cells, including: a porous material that includes as main ingredients conductive particles and a polymer resin, wherein said gas-diffusion layer internally possesses pores with a size from 0.01 ?m to 0.05 ?m, and hollows with a size from 1 ?m to 200 ?m. Further disclosed is a process for producing a gas-diffusion layer used for fuel cells, including: (i) kneading conductive particles, a polymer resin, a pore-forming agent, a surfactant, and a dispersion solvent; (ii) rolling the mixture obtained in Step (i) to shape said mixture into a sheet; (iii) baking the sheet-shaped mixture to sublime the pore-forming agent, thereby forming hollows therein, and to remove the surfactant and the dispersion solvent; and (iv) further rolling the baked mixture to adjust a thickness of the baked mixture.

Abstract: A gas diffusion layer for a fuel battery is used, which is configured by a porous member containing conductive particles, conductive fibers and a polymer resin as main components. An aggregate of the conductive fibers is formed inside the porous member, and an area ratio of the aggregate in any cross-section of the porous member is 0.5% or more and 8% or less. Further, a membrane electrode assembly including the gas diffusion layer for the fuel battery is used. Further, a fuel battery including the gas diffusion layer for the fuel battery is used.

Abstract: A method for producing a fuel cell module including the steps of: forming, in an annular shape, a plurality of resin sheets in a solid state which at least partially contains fibers and overlapping the plurality of resin sheets with respective both surfaces of an electrode membrane assembly; and integrally joining the electrode membrane assembly, with which the plurality of resin sheets are overlapped, and a pair of separators to each other by adhesion by heating the electrode membrane assembly in a state where the electrode membrane assembly is sandwiched by the pair of separators.

Abstract: A positive electrode for an air battery includes a current collector and a porous layer including an electroconductive material. The current collector includes a base having a first major surface, and a plurality of projections disposed on at least the first major surface of the base. The first major surface of the base is a planar surface. The porous layer is disposed on the first major surface of the base and is in direct contact with the first major surface. The projections are in direct contact with the porous layer in the interior of the porous layer.

Abstract: A fuel cell gas diffusion layer includes a porous member containing electrically-conductive particles and polymeric resin as major components, and a plurality of holes extending from a main surface of the fuel cell gas diffusion layer are formed.