Abstract: A carbon dioxide electrolytic device of an embodiment includes: an anode part including an anode which oxidizes water or hydroxide ions to produce oxygen; a cathode part including a cathode which reduces carbon dioxide to produce a carbon compound, a cathode solution flow path which supplies a cathode solution to the cathode, and a gas flow path which supplies carbon dioxide to the cathode; a separator which separates the anode part and the cathode part; and a differential pressure control unit which controls a differential pressure between a pressure of the cathode solution and a pressure of the carbon dioxide so as to adjust a production amount of the carbon dioxide produced by a reduction reaction in the cathode part.

Abstract: A cathode part of an electrochemical reaction device comprises a conductor, a porous body, a reduction catalyst, an electrolytic solution flow path, a first flow path, and a second flow path. The conductor has a conductive surface. The porous body includes a first surface, a second surface, a first porous portion, and a second porous portion. The first surface is in contact with the conductive surface. A contact angle between an inner wall of the second porous portion and water is higher than a contact angle between an inner wall of the first porous portion and the water. The reduction catalyst is supported on the second surface to reduce carbon dioxide. The electrolytic solution flow path faces the reduction catalyst. The first flow path faces the first porous portion. The second flow path faces the second porous portion.

Abstract: An electrochemical reaction device comprises: an anode to oxidize water; an electrolytic solution flow path facing on the anode and through which an electrolytic solution containing the water flows; a cathode including: a porous conductive layer having first and second surfaces; and a reduction catalyst layer having a third surface disposed on the first surface and containing a reduction catalyst to reduce carbon dioxide; a separator between the anode and the cathode; a power supply connected to the anode and the cathode; and a flow path plate including: a fourth surface on the second surface; and a flow path facing on the second surface and through which the carbon dioxide flows. A ratio of an area of an overlap of the second surface and the flow path to an area of the second surface is 0.5 or more and 0.85 or less.

Abstract: A carbon dioxide electrolytic device of an embodiment includes: an anode part including an anode which oxidizes water or hydroxide ions to produce oxygen; a cathode part including a cathode which reduces carbon dioxide to produce a carbon compound, a cathode solution flow path which supplies a cathode solution to the cathode, and a gas flow path which supplies carbon dioxide to the cathode; a separator which separates the anode part and the cathode part; and a differential pressure control unit which controls a differential pressure between a pressure of the cathode solution and a pressure of the carbon dioxide so as to adjust a production amount of the carbon dioxide produced by a reduction reaction in the cathode part.

Abstract: An electrochemical reaction device includes: an electrolytic solution tank to store an electrolytic solution; an oxidation electrode disposed in the electrolytic solution tank; a reduction electrode disposed in the electrolytic solution tank; and a generator connected to the oxidation electrode and the reduction electrode. At least one of the oxidation electrode or the reduction electrode has a porous structure containing fine pores.

Abstract: An electrochemical reaction device includes a first unit group having a plurality of first electrochemical reaction units and a second unit group having a plurality of second electrochemical reaction units. Respective electrolytic tanks of the plurality of first electrochemical reaction units are serially connected with each other. Respective electrolytic tanks of the plurality of second electrochemical reaction units are serially connected with each other. The electrolytic tanks of the plurality of second electrochemical reaction units are parallelly connected to the electrolytic tanks of the plurality of first electrochemical reaction units.

Abstract: The present embodiments provide: a reduction catalyst having high reaction efficiency, a reduction reactor including the same and a reduction method using the same. This catalyst includes a conductor and an organic layer comprises organic modifying groups capable of binding to the surface of the conductor, wherein the organic modifying groups contain a nitrogen-containing heterocycle.

Abstract: An electrochemical reaction device includes: a first electrolytic solution tank having a first storage part and a second storage part; a second electrolytic solution tank having a third storage part and a fourth storage part; a first reduction electrode layer immersed in a first electrolytic solution; a first oxidation electrode layer immersed in a second electrolytic solution; a first generator electrically connected to the first reduction electrode and the first oxidation electrode layer; a second reduction electrode layer immersed in a third electrolytic solution; a second oxidation electrode layer immersed in a fourth electrolytic solution; a second generator electrically connected to the second reduction electrode and the second oxidation electrode layer; and at least one flow path out of a first flow path connecting the first storage part and the fourth storage part and a second flow path connecting the second storage part and the third storage part.

Abstract: A method for producing a stacked electrode of an embodiment includes preparing a multi-layered graphene film, applying a dispersion liquid of metal nanowires onto the multi-layered graphene film, and removing a solvent from the dispersion liquid to prepare a metal wiring on the multi-layered graphene film.

Abstract: An electrochemical reaction device in an embodiment includes: a reaction vessel including a first accommodating part to accommodate a first electrolytic solution containing carbon dioxide, and a second accommodating part to accommodate a second electrolytic solution containing water; a reduction electrode disposed in the first accommodating part; an oxidation electrode disposed in the second accommodating part; a power supply electrode connected to the reduction electrode and the oxidation electrode; and a third accommodating part to mix a first gas component produced in the first accommodating part with the first electrolytic solution after the first gas component is produced.

Abstract: A photoelectrochemical reaction device of an embodiment includes: a first stack including a first electrode, a second electrode, and a photovoltaic layer provided therebetween; a second stack including a third electrode electrically connected to the first electrode, a fourth electrode electrically connected to the second electrode, and an ion migration layer provided therebetween; and an electrolytic solution tank storing a first electrolytic solution in which the third electrode is immersed and a second electrolytic solution in which the fourth electrode is immersed. One of the third and fourth electrodes causes an oxidation reaction, and the other of the third and fourth electrodes causes a reduction reaction. The third and fourth electrodes have ion permeability. An area of the second stack is larger than that of the first stack.

Abstract: According to one embodiment of a CO2 reduction catalyst of the present invention, a conductive material is immersed in an aqueous solution containing a gold source, and a current or a potential is applied, whereby a highly active CO2 reduction catalyst can be formed in a wide range portion on a surface of the conductive material. According to one embodiment of a CO2 reduction catalyst of the present invention, in a CO2 reduction reaction apparatus including a CO2 reduction electrode having the CO2 reduction catalyst, CO2 is reduced.

Abstract: An electrochemical reaction device includes: a first electrolytic solution tank having a first storage part and a second storage part; a second electrolytic solution tank having a third storage part and a fourth storage part; a first reduction electrode layer immersed in a first electrolytic solution; a first oxidation electrode layer immersed in a second electrolytic solution; a first generator electrically connected to the first reduction electrode and the first oxidation electrode layer; a second reduction electrode layer immersed in a third electrolytic solution; a second oxidation electrode layer immersed in a fourth electrolytic solution; a second generator electrically connected to the second reduction electrode and the second oxidation electrode layer; and at least one flow path out of a first flow path connecting the first storage part and the fourth storage part and a second flow path connecting the second storage part and the third storage part.

Abstract: According to one embodiment, a reduction catalyst includes a current collector including a metal layer; and organic molecules including a quaternary nitrogen cation, which are bonded to the metal layer. The organic molecules are represented by any of the following general formulae I to V.

Abstract: To convert light into a chemical substance with high conversion efficiency. A device, comprising: a photovoltaic layer having a first face and a second face; an oxidation electrode layer electrically connected to the first face of the photovoltaic layer; a reduction electrode layer electrically connected to the second face of the photovoltaic layer; a first electrolytic solution being supplied to the oxidation electrode layer; a second electrolytic solution being supplied to the reduction electrode layer; and a porous layer, provided to in contact with at least one of the first electrolytic solution and the second electrolytic solution, having fine pores through which a product produced by the oxidation reaction or the reduction reaction passes, and being given a temperature gradient wherein the product being purified by the porous layer.

Abstract: A carbon dioxide electrolytic device of an embodiment includes: an electrolysis cell including a cathode, an anode, a carbon dioxide supply unit, an electrolytic solution supply unit, and a separator; a power supply; a reaction control unit which causes a reduction reaction and an oxidation reaction by passing an electric current from the power supply to the anode and the cathode; a refresh material supply unit including a gas supply unit which supplies a gaseous substance to at least one of the anode and the cathode; and a refresh control unit which stops supply of the current from the power supply and supply of carbon dioxide and an electrolytic solution, and operates the refresh material supply unit, based on request criteria of a cell output of the electrolysis cell.

Abstract: According to one embodiment, a reduction catalyst includes a charge collector having a metal layer on a surface; and a modified organic molecule bound to a surface of the metal layer and containing a quaternary nitrogen cation.

Abstract: A method of manufacturing a photoelectrode of an embodiment includes: preparing a stack including a first electrode layer having a light transmitting electrode, a second electrode layer having a metal electrode, and a photovoltaic layer disposed between the electrode layers; immersing the stack in an electrolytic solution containing an ion including a metal constituting a catalyst layer which is to be formed on the first electrode layer; and passing a current to the stack through the second electrode layer to electrochemically precipitate at least one selected from the metal and a compound containing the metal, onto the first electrode layer, thereby forming the catalyst layer.

Abstract: A carbon dioxide electrolytic device of an embodiment includes: an electrolysis cell including a cathode, an anode, a carbon dioxide supply unit, an electrolytic solution supply unit, and a separator; a power supply; a reaction control unit which causes a reduction reaction and an oxidation reaction by passing an electric current from the power supply to the anode and the cathode; a refresh material supply unit including a gas supply unit which supplies a gaseous substance to at least one of the anode and the cathode; and a refresh control unit which stops supply of the current from the power supply and supply of carbon dioxide and an electrolytic solution, and operates the refresh material supply unit, based on request criteria of a cell output of the electrolysis cell.

Abstract: An electrochemical reaction device comprises: an anode to oxidize water; an electrolytic solution flow path facing on the anode and through which an electrolytic solution containing the water flows; a cathode including: a porous conductive layer having first and second surfaces; and a reduction catalyst layer having a third surface disposed on the first surface and containing a reduction catalyst to reduce carbon dioxide; a separator between the anode and the cathode; a power supply connected to the anode and the cathode; and a flow path plate including: a fourth surface on the second surface; and a flow path facing on the second surface and through which the carbon dioxide flows. A ratio of an area of an overlap of the second surface and the flow path to an area of the second surface is 0.5 or more and 0.85 or less.