Abstract: An electrochemical reaction device in an embodiment includes: an electrochemical reaction cell including a first accommodation part for accommodating carbon dioxide, a second accommodation part for accommodating an electrolytic solution containing water, or water vapor, a diaphragm provided between the first accommodation part and the second accommodation part, a reduction electrode arranged in the first accommodation part, and an oxidation electrode arranged in the second accommodation part, a detection unit detecting a reaction amount in the electrochemical reaction cell; a regulation unit regulating an amount of the carbon dioxide to be supplied to the first accommodation part, and a control unit controlling the regulation unit based on a detection signal of the detection unit.

Abstract: An electrochemical reaction device in an embodiment includes: a reaction unit including a first accommodation part to accommodate carbon dioxide and a second accommodation part to accommodate an electrolytic solution containing water; a reduction electrode to reduce the carbon dioxide; an oxidation electrode to oxidize the water; a power supply to pass current between the reduction electrode and the oxidation electrode; a pressure regulator to regulate a pressure in the first accommodation part; a reaction product detector to detect at least one of an amount and a kind of a substance produced at the reduction electrode; and a controller to control the pressure regulator based on a detection signal of the reaction product detector.

Abstract: An electrochemical reaction device includes: a first reactor including a first room and a second room, the first room being configured to store a gas containing carbon dioxide or a first electrolytic solution containing carbon dioxide, and the second room being configured to store a second electrolytic solution containing water; a cathode disposed in the first room, the cathode being configured to reduce the carbon dioxide and thus produce a reduction product; an anode disposed in the second room, the anode being configured to oxidize the water and thus produce an oxidation product; a first pressure adjuster configured to adjust pressure in the first room; a temperature detector configured to detect a temperature in the first reactor to form a detection signal; and a controller configured to control the pressure adjuster in accordance with the detection signal from the temperature detector.

Abstract: An electrochemical reaction device includes: a first reactor including a first room and a second room, the first room being configured to store a gas containing carbon dioxide or a first electrolytic solution containing carbon dioxide, and the second room being configured to store a second electrolytic solution containing water; a cathode disposed in the first room, the cathode being configured to reduce the carbon dioxide and thus produce a reduction product; an anode disposed in the second room, the anode being configured to oxidize the water and thus produce an oxidation product; a first pressure adjuster configured to adjust pressure in the first room; a temperature detector configured to detect a temperature in the first reactor to form a detection signal; and a controller configured to control the pressure adjuster in accordance with the detection signal from the temperature detector.

Abstract: An electrode catalyst layer for electrolytic cell 3 of an embodiment includes: a carbon material; a metal catalyst supported on the carbon material; and a water-repellent organic substance. In the electrode catalyst layer for electrolytic cell of the embodiment, the water-repellent organic substance includes an organic substance containing sulfur. A metal-sulfur bond is formed between the organic substance containing sulfur and the metal catalyst. A mass ratio (S/M) of a sulfur element (S) to a metal element (M) in the metal catalyst in the catalyst layer is not less than 0.03 nor more than 0.1.

Abstract: A carbon dioxide electrolytic device, includes: an electrolysis cell including an anode to oxidize water and thus form oxygen, an anode flow path facing the anode, a cathode to reduce carbon dioxide and thus form a carbon compound, a cathode flow path facing the cathode, and a separator between the anode and the cathode; a cooling flow path provided opposite to the anode flow path or the cathode flow path and connected in parallel to the anode flow path; an anode inflow path connecting an inlet of the anode flow path, an inlet of the cooling flow path, and an outlet of a liquid tank to store a liquid containing water; an anode outflow path connecting an outlet of the anode flow path, an outlet of the cooling flow path, and an inlet of the liquid tank; and a cooler to cool the anode outflow path.

Abstract: CO2 reaction methods may include: supplying CO2-containing gas to a first accommodation part (AP) of an electrochemical reaction cell (ERC) from a first supply unit, the ERC including the first AP, a second AP, a cathode in the first AP, and an anode in the second AP; supplying an electrolytic solution containing H2O to the second AP; controlling ERC temperature to 60 to 150° C. so discharged gas and discharged solution discharged from the first and second APs are 60 to 100° C.; supplying current to the electrodes, reducing the CO2 at the reduction electrode and discharge gas from the first AP, and oxidizing H2O and discharge the solution containing O2 and CO2 from the second AP; separating O2 and CO2 gas from the discharged solution; combusting the O2 to produce CO2, and discharging mixed-CO2 gas containing combustion CO2 and CO2; and supplying the mixed-CO2 gas to the first AP.

Abstract: A CO2 electrolyzing method may include: supplying gas containing CO2 and/or a first electrolytic solution (ES) containing CO2 to a first accommodation part (AP) of an electrolysis cell so the gas or first ES contacts a reduction electrode in the first AP, the electrolysis cell including the reduction electrode, an oxidation electrode, the first AP, and a second AP; supplying a second ES containing water and CO2, HCO3-, and/or CO32- to the second AP so the second ES contacts the oxidation electrode in the second AP, the oxidation electrode including a conductive metal substrate and oxidation catalyst layer thereon, of a 20 to 70 mass% Fe, balance Ni, a nickel and iron bonding state in the composite body including Ni(OH)2, NiOOH, and FeOOH; supplying an electric current to the reduction and oxidation electrode, to reduce the CO2 in the reduction electrode and produce a carbon compound.

Abstract: An electrochemical reaction device in an embodiment includes: a reaction unit including a first accommodation part to accommodate carbon dioxide and a second accommodation part to accommodate an electrolytic solution containing water; a reduction electrode to reduce the carbon dioxide; an oxidation electrode to oxidize the water; a power supply to pass current between the reduction electrode and the oxidation electrode; a pressure regulator to regulate a pressure in the first accommodation part; a reaction product detector to detect at least one of an amount and a kind of a substance produced at the reduction electrode; and a controller to control the pressure regulator based on a detection signal of the reaction product detector.

Abstract: A reduction catalyst body for carbon dioxide of an embodiment includes a metal layer, and a projection provided on the metal layer. The projection is constituted of an aggregate of fine metal particles, and possesses a polyhedral structure having surfaces of three faces or more of a polygon. The projection has a site of reducing carbon dioxide, as at least a part of the surfaces.

Abstract: A carbon dioxide electrolytic device in an embodiment includes: an electrolysis cell including a cathode including a CO2 gas supply flow path, an anode, and a separator; a CO2 supply unit configured to supply CO2 gas to the gas supply flow path; and a rinse material supply unit configured to make a rinse material containing H2O flow through the CO2 gas supply flow path. The CO2 gas supply flow path includes a first opening provided on one end side, a second opening provided on another end side, and a third opening provided between the first opening and the second opening. The rinse material supply unit is configured to make the rinse material flow at least between the first opening and the third opening of the CO2 gas supply flow path.

Abstract: A carbon dioxide electrolytic device comprises: an electrolysis cell including a first electrode having a first catalyst to reduce carbon dioxide, a second electrode having a second catalyst to oxidize water or hydroxide ions, a first electrode flow path facing the first electrode, a second electrode flow path facing the second electrode, and a separator separating the first and second electrodes; a power controller; a first flow path through which the carbon dioxide flows; a second flow path through which the carbon compound flows; a third flow path through which an electrolytic solution containing the water flows; a fourth flow path through which the oxygen flows; a first valve to connect the first electrode flow path and the first flow path; a second valve to connect the first electrode flow path and the second flow path; a tank connected to the first electrode flow path and configured to store a rinse solution; and a controller programmed to control opening and closing of the first and second valves in ac

Abstract: A carbon dioxide electrolytic device, includes: an electrolysis cell including an anode to oxidize water and thus form oxygen, an anode flow path facing the anode, a cathode to reduce carbon dioxide and thus form a carbon compound, a cathode flow path facing the cathode, and a separator between the anode and the cathode; a cooling flow path provided opposite to the anode flow path or the cathode flow path and connected in parallel to the anode flow path; an anode inflow path connecting an inlet of the anode flow path, an inlet of the cooling flow path, and an outlet of a liquid tank to store a liquid containing water; an anode outflow path connecting an outlet of the anode flow path, an outlet of the cooling flow path, and an inlet of the liquid tank; and a cooler to cool the anode outflow path.

Abstract: A carbon dioxide reduction system comprises: an electrolytic unit including an electrolysis cell having a cathode to reduce a first substance containing carbon dioxide and thus produce a first product containing a carbon compound, and an anode to oxidize a second substance containing water or hydroxide ions and thus produce a second product containing oxygen, a detection unit to acquire data defining operation states of the electrolysis cell, and an electrolytic regulator to regulate electrolysis conditions of the electrolysis cell; a compression unit including a compressor to compress the first product, and a compressor regulator to regulate compression conditions of the first product by the compressor; and a controller programmed to predict a flow rate of the carbon compound discharged from the electrolysis cell in accordance with the data to control regulation of the compression conditions in accordance with the predicted flow rate.

Abstract: A carbon dioxide electrolytic device includes: an electrolysis cell; a sensor acquiring data indicating a concentration of a first product containing a carbon compound in an anode flow path of the electrolysis cell; a power controller to apply a voltage between an anode and a cathode of the electrolysis cell; a refresh material source including a gas source to supply a gaseous substance to at least one selected from the group consisting of the anode and cathode flow paths, and a solution supply source to supply a rinse solution to at least one selected from the group consisting of the anode and cathode flow paths; and a controller programmed to stop supply of carbon dioxide and an electrolytic solution, and supply the rinse solution to at least one selected from the group consisting of the anode and cathode flow paths from the refresh material source, in accordance with the data.

Abstract: There is provided a carbon dioxide reaction apparatus capable of increasing the use efficiency of CO2.

Abstract: A carbon dioxide electrolytic device in an embodiment includes: an electrolysis cell including a cathode including a CO2 gas supply flow path, an anode, and a separator; a CO2 supply unit configured to supply CO2 gas to the gas supply flow path; and a rinse material supply unit configured to make a rinse material containing H2O flow through the CO2 gas supply flow path. The CO2 gas supply flow path includes a first opening provided on one end side, a second opening provided on another end side, and a third opening provided between the first opening and the second opening. The rinse material supply unit is configured to make the rinse material flow at least between the first opening and the third opening of the CO2 gas supply flow path.

Abstract: The embodiments provide an electrode catalyst layer for reduction of carbon dioxide, a carbon dioxide reduction electrode, and a carbon dioxide electrolysis apparatus. The catalyst layer is made to exhibit high partial current density and to endure a long-term operation by controlling the wettability. The catalyst layer comprises a metallic catalyst supported on carbon material, an ion-conductive material, and a hydrophilic polymer; and is characterized in that a BET specific surface area (AN2) of said catalyst layer determined by nitrogen gas-adsorption and a BET specific surface area (AH2O) of said catalyst layer determined by water vapor-adsorption are in a ratio (AH2O/AN2) of 0.08 or less.

Abstract: An electrolytic cell for carbon dioxide of an embodiment includes: an anode part including an anode to oxidize water or a hydroxide ion and thus produce oxygen and an anode solution flow path to supply an anode solution to the anode; a cathode part including a cathode to reduce carbon dioxide and thus produce a carbon compound, a cathode solution flow path to supply a cathode solution to the cathode, a gas flow path to supply the carbon dioxide to the cathode, and a hydrophobic porous body disposed between the cathode and the gas flow path; and a separator to separate the anode part and the cathode part from each other.

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.