Abstract: A membrane electrode assembly of an embodiment includes: a first electrode including a first diffusion layer, and a first catalyst layer; a second electrode for generating hydrogen, the second electrode including a second diffusion layer, a second catalyst layer including a porous catalyst layer including a porous precious metal or sheet-like precious metal, and a hydrophobic moisture management layer provided between the second catalyst layer and the second diffusion layer, the hydrophobic moisture management layer including carbon particles and carbon fibers, a weight of the carbon fibers being between 1 wt % and 20 wt % of a weight of the second diffusion layer; and an electrolyte membrane provided between the first electrode and the second electrode, the first catalyst layer being provided between the first diffusion layer and the electrolyte membrane, and the second catalyst layer being provided between the second diffusion layer and the electrolyte membrane.

Abstract: A membrane electrode assembly according to an embodiment includes a first diffusion layer; a second diffusion layer; an electrolyte membrane provided between the first diffusion layer and the second diffusion layer; a first catalyst layer provided between the first diffusion layer and the electrolyte membrane; and a second catalyst layer provided between the second diffusion layer and the electrolyte membrane, wherein the first diffusion layer includes a first surface facing the first catalyst layer, and the first surface includes a chamfered portion, and a second surface provided on an opposing side of the first surface, and the second surface includes a protrusion protruding from the side of the first surface toward the side of the second surface.

Abstract: An electrode according to an embodiment includes a support, and a catalyst layer including a sheet layer and a gap layer stacked, alternately on the support. The catalyst layer includes noble oxide and non-noble oxide. 4 [wt %] or more and 8 [wt %] or less of metal elements included in the catalyst layer is non-noble metal. An average thickness of the gap layer is 6 [nm] or more and 50 [nm] or less.

Abstract: An electrode according to an embodiment includes a support, an intermediate layer including carbon particles and resin on the support, and a catalyst layer on the intermediate layer. A thickness of the intermediate layer is 70 [?m] or more and 300 [?m] or less.

Abstract: A manufacturing method for a electrolyte membrane including noble metal particles according to an embodiment includes a step of impregnating cationic noble metal complex ions with a first region of a surface of a cation exchange membrane by spraying solution containing the cationic noble metal complex ions on the cation exchange membrane and drying the sprayed member, and a step of applying a reducing treatment to the cation exchange membrane impregnated with the cationic noble metal complex ions.

Abstract: A membrane electrode assembly according to an embodiment includes a first electrode, a second electrode, an electrolyte membrane provided between the first electrode and the second electrode and a first seal provided on a peripheral portion of the first electrode, having a first opening, housing the first electrode in the first opening, and being contact with the electrolyte membrane or the first seal and a second seal provided on a peripheral portion of the second electrode, having a second opening, housing the second electrode in the second opening, and being contact with the electrolyte membrane.

Abstract: Embodiments provide an amine compound having a large amount of an acid gas to be absorbed and strong oxidation resistance, an absorbent containing the amine compound, a method for removing an acid gas, and an acid gas removal apparatus. The acid gas absorbent includes an amine compound of Formula (1a) or (2b): wherein: R1 to R3 are each independently a hydrogen alkyl group, R2's are each independently an alkyl group, and at least two of R2's contained in one-CR23 are not hydrogen, a's are each independently 0 or 1, m is a number of 1 to 3; n's are each independently a number of 1 to 4.

Abstract: A catalyst laminate includes a plurality of catalyst layers containing at least one of a noble metal and an oxide of the noble metal and at least one of a non-noble metal and an oxide of the non-noble metal, including: two or more first catalyst layers and two or more second catalyst layers. In an atomic percent of the noble metal obtained by using a line analysis by energy dispersive X-ray spectroscopy in a thickness direction of the catalyst laminate. The first catalyst layer is less than an average of a highest value and a lowest value of the atomic percent of the noble metal. The second catalyst layer has an atomic percent of the noble metal equal to or greater than the average of the highest value and the lowest value thereof. The second catalyst layer is present between the first catalyst layers.

Abstract: The embodiments provide an acidic gas absorbent kept from deterioration, an acidic gas removal method using the absorbent, and an acidic gas removal apparatus using the same. The acidic gas absorbent contains an amine compound and water, and further contains superfine bubble containing inert gas wherein an average diameter of said superfine bubble is 150 nm or less. The acidic gas removal method provided here employs that absorbent. The acidic gas removal apparatus is equipped with a unit for introducing the superfine bubbles into the absorbent.

Abstract: A laminated electrolyte membrane of an embodiment includes: a first electrolyte membrane; a second electrolyte membrane; and a nanosheet laminated catalyst layer provided between the first electrolyte membrane and the second electrolyte membrane and including a laminated structure in which a plurality of nanosheet catalysts is laminated with a gap.

Abstract: According to one embodiment, provided is an active material including monoclinic niobium titanium composite oxide particles, and carbon fibers with which at least a part of surfaces of the monoclinic niobium titanium composite oxide particles is covered. The monoclinic niobium titanium composite oxide particles satisfy 1.5?(?/?)?2.5. The monoclinic niobium titanium composite oxide particles have an average primary particle size of 0.05 ?m to 2 ?m. The carbon fibers contain one or more metal elements selected from the group consisting of Fe, Co and Ni, and satisfy 1/10000?(?/?)? 1/100. The carbon fibers have an average fiber diameter in the range of 5 nm to 100 nm.

Abstract: The embodiments provide an acidic gas absorbent having low diffusibility, an acidic gas removal method, and an acidic gas removal apparatus. The acidic gas absorbent according to the embodiment comprises: an amine compound having a vapor pressure of 0.001 to 10 Pa at 20° C.; a water-soluble polymer compound having a mass-average molecular weight of 900 to 200000 and not containing a functional group having a pKa value greater than 7 except for hydroxy; and water.

Abstract: The embodiments provide an acidic gas absorbent having low diffusibility, an acidic gas removal method employing the acidic gas absorbent, and also an acidic gas removal apparatus employing the absorbent. The acidic gas absorbent according to the embodiment comprises: a particular tertiary amine compound, such as, an alkyl dialkanol amine or a hydroxyalkyl piperazine; a halogen-free ionic surfactant; and an aqueous solvent. The embodiments provide not only the acidic gas absorbent but also an acidic gas removal method and apparatus employing the acidic gas absorbent.

Abstract: The embodiments provide an acidic gas absorbent, an acidic gas removal method using the absorbent, and an acidic gas removal apparatus using the absorbent. The absorbent absorbs an acidic gas in a large amount and is hardly diffused.

Abstract: The embodiments provide an acidic gas absorbent kept from deterioration, an acidic gas removal method using the absorbent, and an acidic gas removal apparatus using the same. The acidic gas absorbent contains an amine compound and water, and further contains superfine bubble containing inert gas wherein an average diameter of said superfine bubble is 150 nm or less. The acidic gas removal method provided here employs that absorbent. The acidic gas removal apparatus is equipped with a unit for introducing the superfine bubbles into the absorbent.

Abstract: A carbon dioxide absorbent of an embodiment includes a heterocyclic amine expressed by Formula (1), and the heterocyclic amine having a pKa of any one amino group included in a heterocyclic ring in Formula (1) in a range of 7.0 or more to 8.6 or less and an organic solvent having a boiling point of 150° C. or more at 1 atm. A total mass of the heterocyclic amine and the organic solvent is 70 mass % or more to 100 mass % or less of the carbon dioxide absorbent. Each of R1 to R4 in Formula (1) is H, oxygen double-bonded with carbon of the heterocyclic ring, CH3, OH, or an alkyl chain optionally including a functional group. X1 in Formula (1) is H, CH3, CO, C(O)OC2H5, C(O)OC3H7, C(O)OCH(CH3)2, C(O)OC(CH3)3, C(O)OCH3, C(O)CH3, or C(O)C2H5.

Abstract: The embodiments provide an acidic gas absorbent, an acidic gas removal method, and an acidic gas removal apparatus. The absorbent absorbs an acidic gas in a large amount and hardly diffuses in air. The acidic gas absorbent according to the embodiment comprises an amine compound having a sulfonyl group and two or more amino groups.

Abstract: According to one embodiment, provided is an active material including monoclinic niobium titanium composite oxide particles, and carbon fibers with which at least a part of surfaces of the monoclinic niobium titanium composite oxide particles is covered. The monoclinic niobium titanium composite oxide particles satisfy 1.5?(?/?)?2.5. The monoclinic niobium titanium composite oxide particles have an average primary particle size of 0.05 ?m to 2 ?m. The carbon fibers contain one or more metal elements selected from the group consisting of Fe, Co and Ni, and satisfy 1/10000?(?/?)?1/100. The carbon fibers have an average fiber diameter in the range of 5 nm to 100 nm.

Abstract: A catalyst of an embodiment includes a porous structure including aggregates of particles containing Ru and metal atoms M different from Ru. The particles are a metal oxide. A metal atom ratio of the metal atom M in a surface region of the porous structure is higher than that of the metal atom M in the porous structure as a whole.

Abstract: The embodiments provide an acidic gas absorbent, an acidic gas removal method, and an acidic gas removal apparatus. The absorbent absorbs an acidic gas in a large amount and hardly diffuses in air. The acidic gas absorbent according to the embodiment comprises an amine compound having a sulfonyl group and two or more amino groups.