Abstract: An electrochemical reaction device includes: an electrolytic unit that includes a cathode, an anode, a diaphragm, a cathode and an anode chamber; a first flow path through which a first fluid containing a reducible material flows, and; a second flow path through which a second fluid containing an oxidizable material flows; a third flow path through which a third fluid containing a reduction product flows; a fourth flow path through which a fourth fluid containing an oxidation product flows; a humidifier in the middle of the first flow path to humidify the first fluid; and a condenser in the middle of the first flow path so as to follow the humidifier and to treat the humidified first fluid and thus condenses a part of water vapor in the humidified first fluid to produce a condensed water, and to control a ratio of the condensed water in the humidified first fluid.

Abstract: An electrochemical reaction device includes: a structure that includes: a cathode; an anode; a diaphragm, a cathode chamber; and an anode chamber; a first to a fourth flow path through which a first to fourth fluid flows respectively; at least one controller selected from a first and a second flow rate controller, a first and a second pressure controller, a temperature controller and a power supply, the controller including the first flow rate controller; a gas/liquid separator in the middle of the fourth flow path; a first flowmeter that measures a flow rate of the third fluid; a second flowmeter that measures a flow rate of the fourth fluid; and a control device that measures the sum of the flow rates of the first, third and fourth fluids and controls the controller according to the sum to control a pressure difference between the chambers.

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: A carbon dioxide electrolytic device includes an electrolysis cell including: an anode configured to oxidize water to produce oxygen; a cathode configured to reduce carbon dioxide to produce carbon compound; a cathode flow path plate having a surface provided in contact with the cathode and a cathode flow path provided on the surface and facing to the cathode; and a separator provided between the anode and the cathode. The surface has a hydrophilic region provided on the cathode and having a contact angle to water of less than 45 degrees.

Abstract: A simulator of an embodiment is an electrolysis device simulator configured to simulate, by computation, the performance of a first electrolysis cell stack including one or more electrolysis cells each including a cathode configured to perform a reduction reaction and an anode configured to perform an oxidation reaction. It includes an arithmetic unit configured to perform an arithmetic operation using a first variable group representing at least one of flooding and salt precipitation in the first electrolysis cell stack, in a computational algorithm implemented in the simulator of the embodiment.

Abstract: An electrolysis cell 20 includes: a cathode 31 to reduce a reducible gas; an anode 41 to oxidize an oxidizable substance in an electrolytic solution, the cathode 41 containing titanium; and a separator 50 separating the cathode 31 from the anode 41. The separator 50 includes a porous membrane. The porous membrane gives a pore size distribution defined by a graph having a horizontal axis and a vertical axis, the horizontal axis representing pore sizes of through holes of the porous membrane, the pore sizes being determined by using a porometer, the vertical axis representing a pore size flow distribution of pore volumes corresponding to the pore sizes, and the pore size distribution having a peak top in a range of not less than 0.01 ?m nor more than 0.3 ?m. The porous membrane has an ISO air permeance of not less than 0.8 ?m/Pa·s nor more than 150 ?m/Pa·s.

Abstract: A carbon dioxide electrolytic device of an embodiment includes: an electrolysis cell that includes a cathode, an anode, a cathode flow path, an anode flow path, and a separator; a carbon dioxide supply unit; an electrolytic solution supply unit; an electrolytic solution external flow path including a first pipe connecting the electrolytic solution supply unit to a first opening provided on one end side of the anode flow path, a second pipe connected to a second opening provided on the other end side of the anode flow path, and a third pipe connecting the electrolytic solution supply unit to the second opening of the anode flow path; and an electrolytic solution switching mechanism switching between a first flow in which the electrolytic solution flows from the first opening toward the second opening and a second flow in which the electrolytic solution flows from the second opening toward the first opening.

Abstract: An electrolysis device of an embodiment includes: an electrolysis cell including a a porous cathode in contact with one surface of a diaphragm, an anode in contact with the other surface of the diaphragm, a cathode flow path in contact with the porous cathode, and an anode flow path in contact with the anode; a first supply part supplying the cathode flow path with a gas containing a substance to be reduced; and a second supply part supplying the anode flow path with an electrolysis solution. The cathode flow path has a first area including a gas flow path of a continuous structure that has a first gas inlet connected to the first supply part, and a first gas outlet, and a second area including a gas flow path of an interrupted structure that has a second gas inlet connected to the first gas outlet, and a second gas outlet.

Abstract: A carbon dioxide electrolytic device of an embodiment includes: an electrolysis cell including a cathode, an anode, a gas supply flow path, a solution supply flow path, and a separator; a CO2 gas supply unit configured to supply CO2 gas to the gas supply flow path; an electrolytic solution supply unit configured to supply an electrolytic solution to the solution supply flow path; and a rinse material supply unit configured to supply a rinse material to the gas supply flow path. The gas supply flow path has a first opening, a second opening, and an auxiliary flow path provided to a part of a flow path between the first opening and the second opening, and configured to make at least the rinse material flow therethrough. A switching mechanism configured to switch a flow direction of the rinse material in the auxiliary flow path is connected to the gas supply flow path.

Abstract: A carbon dioxide electrolysis device, includes: an anode configured to oxidize water or a hydroxide ion and thus generate oxygen; an anode solution flow path configured to supply an anode solution to the anode; a cathode configured to reduce carbon dioxide to generate a carbon compound; a gas flow path configured to supply a gas to the cathode, the gas containing carbon dioxide; a diaphragm provided between the anode and the cathode and including a porous film with a hydrophilic polymer supported thereon; and a protective member provided between the anode and the diaphragm and protecting the diaphragm.

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 electrolytic device includes: an electrolysis cell including: an anode; a cathode; a first flow path plate facing on the anode, the first flow path plate having a first recess defining an anode flow path through which a first liquid flows; a second flow path plate facing on the cathode, the second flow path plate having a second recess defining a cathode flow path through which a first gas flows; and a separator provided between the anode and the cathode. The second flow path plate has an uneven surface on an inner surface of the second recess. An arithmetic mean roughness of the uneven surface is 0.03 ?m or more and 50 ?m or less.

Abstract: A sequestration system includes: an electrolysis part having an electrolysis cell having an anode, a cathode, an anode flow path facing on the anode, and a cathode flow path facing on the cathode; and a reaction part configured to switch a first operation and a second operation, the first operation including producing solid carbon using a catalyst from a first raw material containing a first fluid to be introduced from the cathode flow path, and the second operation including performing a reaction of a second raw material containing a second fluid to be introduced from the anode flow path and solid carbon to be deposited on the catalyst to remove at least a part of the deposited solid carbon from the catalyst.

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: A carbon dioxide electrolytic device according to an embodiment includes: an electrolysis cell including a reduction electrode, an oxidation electrode, a gas flow path supplying gas containing CO2 to the reduction electrode, a liquid flow path supplying an electrolytic solution containing water to the oxidation electrode, and a diaphragm separating the reduction electrode from the oxidation electrode; a first supply path connected to the gas flow path; a first discharge path connected to the gas flow path; a first moisture content detecting unit installed in the first discharge path to detect a moisture content in the gas flowing in the first discharge path; a moisture content adjusting unit configured to adjust a moisture content supplied to the reduction electrode; and a control unit configured to control the moisture content adjusting unit based on a detection signal of the first moisture content detecting unit.

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: An electrolytic device, includes: an electrolysis cell including: a cathode; an anode; a cathode flow path facing the cathode; and an anode flow path facing the anode; a tank including: a first room; a second room; and an opening connecting the first and second rooms, the first and second rooms store a liquid containing at least one ion, the tank forms a level difference so that the first liquid level of the liquid in the first room is higher to the bottom of the second room than the second liquid level of the liquid in the second room, and thus cause an ion in the liquid to move from the first to the second room through the opening; a first flow path connecting an outlet of the cathode flow path and the first room; and a second flow path connecting the second room and an outlet of the anode flow path.

Abstract: A carbon dioxide electrolytic device in an embodiment includes: an electrochemical reaction cell including: a first accommodation part that accommodates gas or a first electrolytic solution containing CO2; a second accommodation part that accommodates a second electrolytic solution containing H2O; a diaphragm provided between the first and second accommodation parts; a cathode that is in contact with the gas or the first electrolytic solution; and an anode that is in contact with the second electrolytic solution; a first supply part that supplies the gas or the first electrolytic solution to the first accommodation part; a second supply part that supplies the second electrolytic solution to the second accommodation part; and a carbon dioxide separation part that is connected to a discharge portion of a discharge containing O2 and CO2 from the second accommodation part and includes a cryogenic separation device to separate CO2 from a gas component in the discharge.