Abstract: An electrode for water electrolysis cell includes a conductive base, a first layer, and a second layer. The conductive base includes a transition metal. The first layer is disposed on the conductive base, and includes two or more transition metals and oxygen. The second layer is disposed on the first layer and includes a layered double hydroxide (LDH) including two or more transition metals. The first layer is disposed between the conductive base and the second layer in a thickness direction of the first layer. The first layer includes a first transition metal that is the same as the transition metal included in the conductive base, and a second transition metal that is the same as the transition metal included in the second layer and different from the first transition metal. The first transition metal exists in the first layer at a concentration higher than a concentration of the first transition metal in the second layer.

Abstract: A water electrolysis electrode includes a conductive substrate and a layered double hydroxide layer. The conductive substrate has a surface including nickel having a plane orientation. The layered double hydroxide layer includes a layered double hydroxide including two or more transition metals. The layered double hydroxide layer is disposed on the surface.

Abstract: An electrochemical hydrogen pump includes at least one hydrogen pump unit including an electrolyte membrane, an anode on one main surface of the electrolyte membrane, a cathode on the other main surface of the electrolyte membrane, an anode separator on the anode, and a cathode separator on the cathode, the at least one hydrogen pump unit transferring, to the cathode, hydrogen supplied to the anode and pressurizing the hydrogen, a first fixing member for preventing movement of the cathode separator in a direction in which the cathode separator is stacked, a first end plate on the anode separator at one end in the stacking direction, a second end plate on the cathode separator at the other end in the stacking direction, and a first gas flow channel through which hydrogen in the cathode is supplied to a first space between the second end plate and the cathode separator.

Abstract: A compression apparatus includes a stack of electrochemical cells each including an anode, a cathode, and an electrolyte membrane interposed therebetween, a pair of insulating plates disposed at respective ends of the stack in a stacking direction, a pair of end plates disposed on outside surfaces of the respective insulating plates, and a voltage applicator that applies a voltage between the anode and the cathode. The end plate having the cathode gas channel includes a first region that includes an outer peripheral surface of the cathode gas channel and is composed of a first steel material and a second region other than the first region which is composed of a second steel material. The first steel material has higher hydrogen embrittlement resistance than the second steel material, and the second steel material has higher stiffness than the first steel material.

Abstract: A compression apparatus includes a stack of electrochemical cells each including an anode, a cathode, and an electrolyte membrane interposed therebetween, a pair of insulating plates disposed at respective ends of the stack in a stacking direction, a pair of first end plates disposed on outside surfaces of the respective insulating plates, and a voltage applicator that applies a voltage between the anode and the cathode. Upon the voltage applicator applying the voltage, the compression apparatus causes hydrogen included in a hydrogen-containing gas fed to the anode to move to the cathode and produces compressed hydrogen. One of the first end plates have a first channel formed therein, through which the hydrogen-containing gas fed to the anode flows, and a second channel formed therein, through which a heating medium flows. The compression apparatus further includes a heater that heats the heating medium.

Abstract: An electrochemical hydrogen pump includes at least one hydrogen pump unit including an electrolyte membrane, an anode on one main surface of the electrolyte membrane, a cathode on the other main surface of the electrolyte membrane, an anode separator on the anode, and a cathode separator on the cathode, the at least one hydrogen pump unit transferring, to the cathode, hydrogen supplied to the anode and pressurizing the hydrogen, a first fixing member for preventing movement of the cathode separator in a direction in which the cathode separator is stacked, a first end plate on the anode separator at one end in the stacking direction, a second end plate on the cathode separator at the other end in the stacking direction, and a first gas flow channel through which hydrogen in the cathode is supplied to a first space between the second end plate and the cathode separator.

Abstract: An electrochemical hydrogen pump includes at least one hydrogen pump unit including an electrolyte membrane, an anode on one main surface of the electrolyte membrane, a cathode on the other main surface of the electrolyte membrane, an anode separator on the anode, and a cathode separator on the cathode, the at least one hydrogen pump unit transferring, to the cathode, hydrogen supplied to the anode and pressurizing the hydrogen, a first fixing member for preventing movement of the cathode separator in a direction in which the cathode separator is stacked, a first end plate on the anode separator at one end in the stacking direction, a second end plate on the cathode separator at the other end in the stacking direction, and a first gas flow channel through which hydrogen in the cathode is supplied to a first space between the second end plate and the cathode separator.

Abstract: A fuel cell system includes a fuel feeder that supplies fuel, a fuel cell stack that generates power through an electrochemical reaction using air and a hydrogen-containing gas generated from the fuel, a first temperature sensor that senses the temperature of the fuel cell stack, and a controller. The fuel cell stack has a membrane electrode assembly including an electrolyte membrane through which protons can pass, a cathode on one side of the electrolyte membrane, and an anode on the other side of the electrolyte membrane. The controller defines an upper limit of current output from the fuel cell stack on the basis of the temperature of the fuel cell stack, the supply of the fuel, and the hydrogen consumption of the fuel cell stack associated with internal leakage current and keeps the current output from the fuel cell stack at or below the upper limit.

Abstract: A proton conductor is a proton conductor represented by a composition formula of BaZr1?x?yYxInyO3, and x and y in the composition formula satisfy 0<y?0.013 and 0<x+y<0.5. A small amount of In is added to the composition in a predetermined range, whereby a resistance of the crystal grain boundary of the proton conductor can be decreased so as to compensate for or even exceed the increase in resistance in the crystal gains of the proton conductor caused by the addition of In, and as a result, the entire resistance can be decreased.

Abstract: An apparatus includes: an electrolyte membrane; a cathode catalyst layer provided to one main surface of the electrolyte membrane; an anode catalyst layer provided to the other main surface of the electrolyte membrane; a cathode gas diffusion layer provided on a main surface of the cathode catalyst layer not facing the electrolyte membrane; a separator including a recess through which cathode gas flows; an anode gas diffusion layer provided on a main surface of the anode catalyst layer not facing the electrolyte membrane; a voltage applicator applying a voltage between the cathode catalyst layer and the anode catalyst layer; and a fastener fastening a laminated body. The cathode gas diffusion layer is accommodated in the recess, projects from the recess in a thickness direction before fastening of the laminated body, and includes an elastic member between side surfaces of the cathode gas diffusion layer and of the recess.

Abstract: An electrochemical hydrogen pump includes an electrolyte membrane having a pair of primary surfaces; a cathode catalyst layer provided on one primary surface of the electrolyte membrane; an anode catalyst layer provided on the other primary surface of the electrolyte membrane; a cathode gas diffusion layer provided on the cathode catalyst layer; an anode gas diffusion layer provided on the anode catalyst layer; and a voltage application device applying a voltage between the cathode catalyst layer and the anode catalyst layer, The anode gas diffusion layer includes a laminate of metal sheets which are provided with vents, and among the metal sheets, the maximum diameter of vents provided in a first metal sheet adjacent to the anode catalyst layer is smaller than the maximum diameter of vents provided in a second metal sheet adjacent to the first metal sheet.

Abstract: A hydrogen purifier (100) includes: a shift conversion catalyst (5a) which reduces, through a shift reaction, carbon monoxide contained in a hydrogen-containing gas; and a methanation catalyst (6a) which reduces, through a methanation reaction, carbon monoxide contained in the hydrogen-containing gas that has passed through the shift conversion catalyst (5a). The shift conversion catalyst (5a) and the methanation catalyst (6a) are heat exchangeable with each other via a first partition wall (8), and a flow direction of the hydrogen-containing gas that passes through the shift conversion catalyst (5a) is opposite to a flow direction of the hydrogen-containing gas that passes through the methanation catalyst (6a).

Abstract: A hydrogen generator (100) includes: a hydrogen generating unit (1) configured to generate a hydrogen-containing gas by using a raw material gas; a hydro-desulfurizer (7) configured to remove a sulfur compound in the raw material gas supplied to the hydrogen generating unit (1); a first gas channel (5) through which the raw material gas supplied through the hydro-desulfurizer (7) to the hydrogen generating unit (1) flows; a recycle channel (10) through which the hydrogen-containing gas from the hydrogen generating unit (1) is supplied to the raw material gas in the first gas channel (5) located upstream of the hydro-desulfurizer (7); a raw material gas supply unit (6) disposed between the hydro-desulfurizer (7) and a meeting point where the first gas channel (5) and the recycle channel (10) meet; and a first on-off valve (8) disposed between the raw material gas supply unit (6) and the hydro-desulfurizer (7) to close when the hydrogen generator (100) stops.

Abstract: A hydrogen generation apparatus (150) includes: a first desulfurizer (13) configured to remove, through adsorption, a sulfur compound in a raw material gas that is to be supplied to a reformer; a second desulfurizer (21) configured to hydrodesulfurize a sulfur compound in the raw material gas that is to be supplied to the reformer; a first passage (16) through which the raw material gas is supplied to the reformer through the first desulfurizer (13); a second passage (17) through which the raw material gas is supplied to the reformer through the second desulfurizer (21), without passing through the first desulfurizer (13); a switch configured to switch a passage through which the raw material gas flows between the first passage (16) and the second passage (17); and a controller.

Abstract: A fuel cell power generation system 100 for performing power generation using hydrogen-containing gas generated from a raw material containing a hydrocarbon component and an odorizer component includes a raw material supply section 4 for controlling a flow rate of the raw material; a water supply section 3 for supplying water; an adsorptive removal section 5 for causing the raw material to pass therethrough and adsorbing the odorizer component contained in the raw material; a reformer 1 for generating the hydrogen-containing gas by a reforming reaction of the raw material which has passed the adsorptive removal section and water supplied from the water supply section; a fuel cell 8 for performing power generation using the hydrogen-containing gas as a fuel; and an operating control section for, as an accumulated flow volume of the raw material supplied to the adsorptive removal section 5 from the raw material supply section 4 increases, decreasing the flow rate of the raw material to be supplied to the adsorp

Abstract: A hydrogen generating apparatus is provided that further suppresses deterioration in capability of a converting catalyst in raw material purge in a shutdown operation.

Abstract: A fuel processing apparatus includes: a reformer; a raw material supplying unit for supplying a raw material to the reformer and blocking the supply of the raw material; a steam supplying unit for supplying steam to the reformer and blocking the supply of the steam; a closing device for blocking a gas passage located downstream of the reformer; and a controller. The controller seals the reformer by blocking the supply of the raw material from the raw material supplying unit and the supply of the steam from the steam supplying unit and closing the closing device, and performs a pressure compensation operation by using both the supply of the steam from the steam supplying unit and the supply of the raw material from the raw material unit as pressure in the reformer decreases due to a temperature decrease.

Abstract: A hydrogen generator of the present invention includes: a raw material supplying device (4) configured to supply a raw material; a water supplying device (3) configured to supply water; an evaporator (23) configured to evaporate the water supplied from the water supplying device (3) to generate steam; a reformer (20) having a reforming catalyst which generates a hydrogen-containing gas by a reforming reaction using the raw material and the steam; a valve (12) disposed on a gas passage to cause the reformer (20) to be communicated with an atmosphere and block the reformer (20) from the atmosphere, the gas passage being located downstream of the reformer (20); and a controller (11) configured to stop supplying the water from the water supplying device (3), then continue to supply the raw material from the raw material supplying device (4) with the valve (12) open, and stop supplying the raw material from the raw material supplying device (4) and close the valve (12) before an inside of the reformer (20) is purg

Abstract: A hydrogen generation apparatus 100 of the present invention includes: a reformer 4 for generating a hydrogen-containing gas through a reforming reaction using a raw material gas; a raw material gas supplier 13 for supplying the raw material gas to the reformer 4; a methanator 6 for reducing carbon monoxide contained in the hydrogen-containing gas through a methanation reaction; and a controller for controlling the raw material gas supplier 13 to decrease an amount of the raw material gas supplied to the reformer 4 so as to decrease an amount of generation of the hydrogen-containing gas when a temperature of the methanator 6 increases.

Abstract: A method of shutting down a hydrogen generation apparatus for limiting degradation in a catalyst due to dew condensation at the time of shutdown is provided. The method of shutting down the hydrogen generation apparatus comprising, a combustor which supplies heat necessary to a reforming device, a first air supplier which supplies air to the combustor, a combustion exhaust gas path formed such that the combustion exhaust gas produced in the combustor makes heat exchange with the reforming device and then with a CO reducing device, and a controller which operates the first air supplier so that the temperature of the gas in the CO reducing device does not become equal to or lower than a dew point after shutdown of the combustion operation of the combustor and before a start of a purging operation to purge the interiors of the reforming device and the CO reducing device with a replacement gas.