Abstract: An electrode catalyst according to the present disclosure includes a mesoporous material and catalyst metal particles which are supported in at least an inner portion of the mesoporous material and which contain platinum and a metal different from platinum. The mesoporous material has mesopores having a mode radius of greater than or equal to 1 nm and less than or equal to 25 nm and a pore volume of greater than or equal to 1.0 cm3/g and less than or equal to 3.0 cm3/g. The catalyst metal particles which are supported have an L10 structure. The proportion of the L10 structure is greater than 0.25.

Abstract: A catalyst includes a mesoporous material and catalytic metal particles supported at least within the mesoporous material and containing platinum and a metal different from platinum. The mesoporous material has mesopores with a mode radius of 1 to 25 nm and a pore volume of 1.0 to 3.0 cm3/g before supporting of the catalytic metal particles, and has an average particle size of greater than or equal to 200 nm. A molar ratio of the metal different from platinum and contained in the catalytic metal particles relative to all metals contained in the catalytic metal particles is greater than or equal to 0.25, and among the catalytic metal particles, a volume ratio of catalytic metal particles having a particle size of greater than or equal to 20 nm is less than or equal to 10%.

Abstract: An electrode catalyst for an electrochemical device, the electrode catalyst including: mesoporous carbon particles having an average crystallite size along a 002 plane of greater than or equal to 1.6 nm and less than or equal to 3.4 nm; and catalyst metal particles supported on the mesoporous carbon particles. The mesoporous carbon particles have an average particle diameter of primary particles of greater than or equal to 500 nm.

Abstract: An electrode catalyst of an electrochemical device according to the present disclosure is an electrode catalyst of an electrochemical device, the electrode catalyst including a mesoporous material; and catalyst metal particles supported at least in the mesoporous material. Before supporting the catalyst metal particles, the mesoporous material includes mesopores having a mode radius of 1 to 25 nm and a pore volume of 1.0 to 3.0 cm3/g, and number density of the catalyst metal particles supported in the mesopores is lower at an outer side of the mesoporous material than number density of the catalyst metal particles supported in the mesopores at an inner side thereof.

Abstract: An electrode catalyst for a fuel battery includes a mesoporous material and catalyst metal particles supported at least in the mesoporous material. In the electrode catalyst for a fuel battery, before supporting the catalyst metal particles, the mesoporous material has mesopores having a mode radius of greater than or equal to 1 nm and less than or equal to 25 nm and has a value of greater than 0.90, the value being determined by dividing a specific surface area S1-25 (m2/g) of the mesopores obtained by analyzing a nitrogen adsorption-desorption isotherm according to a BJH method, the mesopores having a radius of greater than or equal to 1 nm and less than or equal to 25 nm, by a BET specific surface area (m2/g) evaluated according to a BET method.

Abstract: A catalyst includes a mesoporous material and catalytic metal particles supported at least within the mesoporous material and containing platinum and a metal different from platinum. The mesoporous material has mesopores with a mode radius of 1 to 25 nm and a pore volume of 1.0 to 3.0 cm3/g before supporting of the catalytic metal particles, and has an average particle size of greater than or equal to 200 nm. A molar ratio of the metal different from platinum and contained in the catalytic metal particles relative to all metals contained in the catalytic metal particles is greater than or equal to 0.25, and among the catalytic metal particles, a volume ratio of catalytic metal particles having a particle size of greater than or equal to 20 nm is less than or equal to 10%.

Abstract: An electrode catalyst layer of an electrochemical device is an electrode catalyst layer of an electrochemical device, the electrode catalyst layer including a mesoporous carbon; a catalyst metal supported at least in the mesoporous carbon; and an ionomer. Before supporting the catalyst metal, the mesoporous carbon has mesopores with a mode radius of 1 nm to 25 nm and a pore volume of 1.0 cm3/g to 3.0 cm3/g and has an average particle diameter of 200 nm or more.

Abstract: An electrode catalyst of an electrochemical device according to the present disclosure is an electrode catalyst of an electrochemical device, the electrode catalyst including a mesoporous material; and catalyst metal particles supported at least in the mesoporous material. Before supporting the catalyst metal particles, the mesoporous material includes mesopores having a mode radius of 1 to 25 nm and a pore volume of 1.0 to 3.0 cm3/g, and number density of the catalyst metal particles supported in the mesopores is lower at an outer side of the mesoporous material than number density of the catalyst metal particles supported in the mesopores at an inner side thereof.

Abstract: An electrode catalyst layer of an electrochemical device is an electrode catalyst layer of an electrochemical device, the electrode catalyst layer including a mesoporous carbon; a catalyst metal supported at least in the mesoporous carbon; and an ionomer. Before supporting the catalyst metal, the mesoporous carbon has mesopores with a mode radius of 1 nm to 25 nm and a pore volume of 1.0 cm3/g to 3.0 cm3/g and has an average particle diameter of 200 nm or more.

Abstract: A cell includes: a membrane electrode assembly; and a pair of separators. The membrane electrode assembly includes a polymer electrolyte membrane, an anode catalyst layer on a first main surface of the polymer electrolyte membrane, and a cathode catalyst layer on a second main surface. The anode catalyst layer contains a first catalyst material having activity against a hydrogen oxidation reaction and a first electrically conductive material whose electrical resistance under a hydrogen atmosphere and under an oxygen atmosphere are different from each other. The cathode catalyst layer contains a second catalyst material having activity against an oxygen reduction reaction and a second electrically conductive material different from the first electrically conductive material. An electrical resistance of the cell when the anode catalyst layer is under oxygen atmosphere is more than twice the electrical resistance of the cell when the anode catalyst layer is under hydrogen atmosphere.

Abstract: A method of fabricating a membrane electrode assembly, comprising: obtaining a mixture by mixing and kneading electrically conductive particles, a polymer resin, a surfactant, and a dispersion solvent (S1); obtaining a sheet-like mixture by rolling out and shaping the mixture (S2); obtaining a carbon sheet by heat-treating the sheet-like mixture at a first heat treatment temperature such that the surfactant and the dispersion solvent are removed from the sheet-like mixture (S3); obtaining a dispersion liquid by mixing electrically conductive particles, a polymer resin, a surfactant, and a dispersion solvent (S4); forming, on the carbon sheet, a dispersion liquid layer thinner than the carbon sheet by forming and drying a coating of the dispersion liquid on the carbon sheet (S5); obtaining a gas diffusion layer in which a carbon layer is formed on the carbon sheet, by heat-treating the carbon sheet on which the dispersion liquid layer is formed at a second heat treatment temperature lower than the first heat t

Abstract: A fuel cell of the present invention includes cell blocks (101, 102) each formed by stacking cells (51, 52) and a cooling medium connecting channel (103) connecting a cell block internal cooling medium channel (153A) of the cell block (101) and a cell block internal cooling medium channel (153B) of the cell block (102) in series. A catalyst layer includes a catalyst support and polymer electrolyte adhered to the catalyst support, the catalyst support containing an electrode catalyst and carbon powder supporting the electrode catalyst.

Abstract: A method of fabricating a membrane electrode assembly, comprising: obtaining a mixture by mixing and kneading electrically conductive particles, a polymer resin, a surfactant, and a dispersion solvent (S1); obtaining a sheet-like mixture by rolling out and shaping the mixture (S2); obtaining a carbon sheet by heat-treating the sheet-like mixture at a first heat treatment temperature such that the surfactant and the dispersion solvent are removed from the sheet-like mixture (S3); obtaining a dispersion liquid by mixing electrically conductive particles, a polymer resin, a surfactant, and a dispersion solvent (S4); forming, on the carbon sheet, a dispersion liquid layer thinner than the carbon sheet by forming and drying a coating of the dispersion liquid on the carbon sheet (S5); obtaining a gas diffusion layer in which a carbon layer is formed on the carbon sheet, by heat-treating the carbon sheet on which the dispersion liquid layer is formed at a second heat treatment temperature lower than the first heat t

Abstract: A fuel cell of the present invention includes a membrane-electrode assembly (10), an anode separator (20), and a cathode separator (30). The membrane-electrode assembly (10) includes: a polymer electrolyte membrane (1); a first anode catalyst layer (2A) and an anode gas diffusion layer (4) sequentially stacked on one of main surfaces of the polymer electrolyte membrane (1); a second anode catalyst layer (2B) disposed between the polymer electrolyte membrane (1) and the first anode catalyst layer (2A); and a cathode catalyst layer (3) and a cathode gas diffusion layer (5) sequentially stacked on the other main surface of the polymer electrolyte membrane (1). The second anode catalyst layer (2B) contains a catalyst which adsorbs a sulfur compound.

Abstract: A membrane-membrane reinforcing member assembly includes: a polymer electrolyte membrane (1) having a substantially square shape; a pair of membrane-like first membrane reinforcing members (10a) disposed on one main surface of the polymer electrolyte membrane (1) so as to extend along a pair of opposed sides, respectively, of four sides of said one main surface; and a pair of membrane-like second membrane reinforcing members (10b) disposed on another main surface of the polymer electrolyte membrane (1) so as to extend along a pair of opposed sides, respectively, of four sides of said another main surface, wherein: portions of the polymer electrolyte membrane (1) at which portions the first membrane reinforcing members (10a, 10a) and the second membrane reinforcing members (10b, 10b) are disposed are concave; and the first membrane reinforcing members (10a, 10a) and the second membrane reinforcing members (10b, 10b) are disposed such that main surfaces thereof are exposed, and the first membrane reinforcing me

Abstract: A fuel cell of the present invention includes cell blocks (101, 102) each formed by stacking cells (51, 52) and a cooling medium connecting channel (103) connecting a cell block internal cooling medium channel (153A) of the cell block (101) and a cell block internal cooling medium channel (153B) of the cell block (102) in series. A catalyst layer includes a catalyst support and polymer electrolyte adhered to the catalyst support, the catalyst support containing an electrode catalyst and carbon powder supporting the electrode catalyst.

Abstract: A fuel cell of the present invention includes a membrane-electrode assembly (10), an anode separator (20), and a cathode separator (30). The membrane-electrode assembly (10) includes: a polymer electrolyte membrane (1); a first anode catalyst layer (2A) and an anode gas diffusion layer (4) sequentially stacked on one of main surfaces of the polymer electrolyte membrane (1); a second anode catalyst layer (2B) disposed between the polymer electrolyte membrane (1) and the first anode catalyst layer (2A); and a cathode catalyst layer (3) and a cathode gas diffusion layer (5) sequentially stacked on the other main surface of the polymer electrolyte membrane (1). The second anode catalyst layer (2B) contains a catalyst which adsorbs a sulfur compound.

Abstract: A polymer electrolyte fuel cell of the present invention comprises an electrolyte layer-electrode assembly (8), an anode separator (11) which is provided with a fuel gas channel (13), and a cathode separator (10) which is provided with an oxidizing gas channel (12), wherein low-level humidified reactant gases are supplied to a fuel gas channel (13) and to an oxidizing gas channel (12), respectively; and wherein a level of hydrophilicity of a section (hereinafter referred to as a cathode gas diffusion layer upstream section) of a cathode gas diffusion layer (3) which is opposite to an upstream region of the oxidizing gas channel (12) including a mostupstream region thereof is set lower than a level of hydrophilicity of a section (hereinafter referred to as anode gas diffusion layer upstream opposite section) of the anode gas diffusion layer (6) which is opposite to the cathode gas diffusion layer upstream section (3a) by making the level of hydrophilicity of an entire region of the anode gas diffusion layer up

Abstract: A membrane-membrane reinforcing member assembly includes: a polymer electrolyte membrane (1) having a substantially square shape; a pair of membrane-like first membrane reinforcing members (10a) disposed on one main surface of the polymer electrolyte membrane (1) so as to extend along a pair of opposed sides, respectively, of four sides of said one main surface; and a pair of membrane-like second membrane reinforcing members (10b) disposed on another main surface of the polymer electrolyte membrane (1) so as to extend along a pair of opposed sides, respectively, of four sides of said another main surface, wherein: portions of the polymer electrolyte membrane (1) at which portions the first membrane reinforcing members (10a, 10a) and the second membrane reinforcing members (10b, 10b) are disposed are concave; and the first membrane reinforcing members (10a, 10a) and the second membrane reinforcing members (10b, 10b) are disposed such that main surfaces thereof are exposed, and the first membrane reinforcing me