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 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 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 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 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 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: A fuel cell stack includes: a cell stack including separator plates, and cells each placed between the separator plates; a pair of current collectors that hold external lateral surface of the cell stack in a cell-stacking direction; and a pair of end plates that hold the pair of current collectors from outsides of said current collectors in the cell-stacking direction, wherein the cell stack possesses (i) at least one first opening formed on one external lateral surface of said cell stack, said one external lateral surface located along a direction perpendicular to the cell-stacking direction, (ii) a second opening formed on an external lateral surface of the cell stack opposite to the one external lateral surface, and (ii) at least one passage that extends through an inside of the cell stack from the at least one first opening or the at least one second opening.

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.

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 fuel cell, including: a polymer electrolyte membrane; a pair of catalyst layers; a pair of gas-diffusion layers; a pair of separators including first and second separators; and at least one frame, wherein the catalyst layers, the gas-diffusion layers, and the separators are placed respectively on both sides of the polymer electrolyte membrane in this order, the at least one frame is placed between the pair of the separators, and surrounds outer peripheries of the gas-diffusion layers and the catalyst layers, and the frame has a rigidity of about 1 GPa or higher in terms of the Young's modulus.

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: A fuel cell includes a membrane electrode assembly, an anode gas diffusion layer, and a cathode gas diffusion layer, a pair of separators for clamping a laminate made up of the membrane electrode assembly, the anode gas diffusion layer and cathode gas diffusion layer, and a frame that is formed from thermosetting resin and disposed between the separators to surround a periphery of the laminate. At least one of the anode gas diffusion layer and cathode gas diffusion layer is formed from a composite of thermoplastic resin and conductive particles, and includes a protrusion that protrudes beyond a level of a surface of the frame which faces one of the pair of separators in a state that the laminate is not clamped between the separators under a predetermined pressure.

Abstract: A fuel cell includes: a membrane electrolyte assembly which includes a polymer electrolyte membrane and a pair of catalyst electrodes between which the polymer electrolyte membrane is held and separators between which the membrane electrolyte assembly is held. The first separator includes first gas flow channels and second gas flow channels which are adjacent to the first gas flow channels, the first and second gas flow channels supplying an oxidizing gas or a fuel gas to the membrane electrolyte assembly. The first and second gas flow channels are parallel to each other and are alternately arranged, the first gas flow channels are larger in cross sectional area than the second gas flow channels.

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.

Abstract: A fuel treatment device includes: a reforming section that produces a hydrogen-rich gas containing carbon monoxide and water; a converting section that produces a hydrogen-rich gas containing a lower concentration of carbon monoxide by reacting the carbon monoxide and the water in the hydrogen-rich gas; a mixing channel that produces a mixed gas by mixing the hydrogen-rich gas containing the lower concentration of the carbon monoxide with air containing oxygen; an air supplying section that is connected to an upstream end of the mixing channel and supplies the air to the mixing channel; and a selective oxidizing section that is connected to a downstream end of the mixing channel and converts the mixed gas into a fuel gas by reacting the carbon monoxide and the oxygen in the mixed gas, wherein the mixing channel includes a gas supply region at the upstream side and a gas diffusion region at the downstream side, and has two or more gas supply ports connecting the gas supply region with the converting section, a

Abstract: A fuel cell comprising: a membrane electrolyte assembly having a polymer electrolyte membrane and a pair of catalyst electrodes, namely an air electrode and a fuel electrode sandwiching the polymer electrolyte membrane; a pair of separators, namely an air electrode separator and a fuel electrode separator sandwiching the membrane electrolyte assembly; two or more oxidizing gas channels running in a certain direction for the purpose of supplying an oxidizing gas to the air electrode; and two or more linear fuel gas channels arranged parallel to the certain direction for the purpose of supplying a fuel gas to the fuel electrode. Large gaps and small gaps are provided alternately between adjacent two oxidizing gas channels along the certain direction, and the fuel gas channels do not overlap portions of the oxidizing gas channels, that are parallel to the fuel gas channels.

Abstract: Provided is a fuel cell comprising a membrane electrode assembly, a pair of separators that sandwich the membrane electrode assembly therebetween, and a gas inlet distribution part that connects a reactive gas supply manifold hole and a reactive gas flow channel, wherein the gas inlet distribution part comprises n (n is an integer of 2 or more) distribution ribs that divide the gas inlet distribution part into a plurality of spaces, and each have a long axis perpendicular to the long axis of the linear gas flow channel and have two or more slits parallel to the long axis of the linear gas flow channel, when among the ribs, a distribution rib closest to the reactive gas supply manifold hole is defined as a first distribution rib, a distribution rib closest to the reactive gas flow channel is defined as an n-th distribution rib, and among the spaces, a space on the reactive gas supply manifold hole side from the first distribution rib is defined as a diffusion space, the cross-sectional area of the diffusion sp

Abstract: A fuel cell comprising: a membrane electrolyte assembly having a polymer electrolyte membrane and a pair of catalyst electrodes, namely an air electrode and a fuel electrode sandwiching the polymer electrolyte membrane; a pair of separators, namely an air electrode separator and a fuel electrode separator sandwiching the membrane electrolyte assembly; two or more oxidizing gas channels running in a certain direction for the purpose of supplying an oxidizing gas to the air electrode; and two or more linear fuel gas channels arranged parallel to the certain direction for the purpose of supplying a fuel gas to the fuel electrode. Large gaps and small gaps are provided alternately between adjacent two oxidizing gas channels along the certain direction, and the fuel gas channels do not overlap portions of the oxidizing gas channels, that are parallel to the fuel gas channels.