US20230002919A1 - Carbon Dioxide Gas Phase Reduction Apparatus and Method - Google Patents

Carbon Dioxide Gas Phase Reduction Apparatus and Method Download PDF

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US20230002919A1
US20230002919A1 US17/784,017 US201917784017A US2023002919A1 US 20230002919 A1 US20230002919 A1 US 20230002919A1 US 201917784017 A US201917784017 A US 201917784017A US 2023002919 A1 US2023002919 A1 US 2023002919A1
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reduction
tank
carbon dioxide
oxidation
electrode
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Sayumi Sato
Yuya Uzumaki
Yoko Ono
Takeshi Komatsu
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NTT Inc
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Nippon Telegraph and Telephone Corp
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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    • C25B1/01—Products
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    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
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    • C25B1/55—Photoelectrolysis
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    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
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    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C25B3/01—Products
    • C25B3/03—Acyclic or carbocyclic hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C25B3/01—Products
    • C25B3/07—Oxygen containing compounds
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C25B3/20—Processes
    • C25B3/25—Reduction
    • C25B3/26—Reduction of carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C25B9/21—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms two or more diaphragms
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/50—Cells or assemblies of cells comprising photoelectrodes; Assemblies of constructional parts thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/042—Electrodes formed of a single material
    • C25B11/049—Photocatalysts

Definitions

  • the present invention relates to a carbon dioxide gas phase reduction device and a carbon dioxide gas phase reduction method.
  • a carbon dioxide gas phase reduction device disclosed in NPL 1 is configured by disposing a gas reduction sheet, in which an ion exchange membrane (Nafion (registered trademark)) and a reduction electrode (Cu) are combined, between a left oxidation tank and a right reduction tank.
  • the ion exchange membrane is disposed toward the oxidation tank side
  • the reduction electrode is disposed toward the reduction tank side.
  • the oxidation tank is filled with a potassium hydroxide (KOH) aqueous solution as an electrolytic solution, and an aluminum gallium nitride (AlGaN) oxidation electrode in which a nickel oxide (NiO) catalyst is laminated is immersed in the aqueous solution.
  • KOH potassium hydroxide
  • AlGaN aluminum gallium nitride
  • the oxidation electrode is connected to the reduction electrode of the gas reduction sheet via a conducting wire.
  • a carbon dioxide reduction reaction proceeds at a three-phase interface consisting of the ion exchange membrane (Nafion) of the gas reduction sheet, the reduction electrode (Cu), and the carbon dioxide (CO 2 ) in the reduction tank.
  • oxygen is generated due to an oxidation reaction of water.
  • hydrogen is generated by a reduction reaction of protons in the ion exchange membrane, and carbon monoxide and formic acid are generated by a carbon dioxide reduction reaction.
  • the potassium hydroxide aqueous solution which is the electrolytic solution
  • the reduction electrode deteriorates, a reaction field of the carbon dioxide reduction reaction is lost, and a lifespan of the carbon dioxide reduction reaction is reduced.
  • a method in which the potassium hydroxide aqueous solution is poured into the oxidation tank when an operation of the gas phase reduction device is started, and the potassium hydroxide aqueous solution is discharged from the oxidation tank when the operation is stopped, and thus contact between the potassium hydroxide aqueous solution and the reduction electrode is limited to only during an operation of the gas phase reduction device is also conceivable.
  • oxygen generated in the oxidation tank is released from the oxidation tank when a valve is opened and closed, which makes recovery difficult.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of inhibiting deterioration of a reduction electrode and improving a lifespan of a carbon dioxide reduction reaction on the reduction electrode.
  • a carbon dioxide gas phase reduction device includes: an oxidation tank including an oxidation electrode; a reduction tank to which carbon dioxide is supplied; an intermediate tank that is disposed between the oxidation tank and the reduction tank and is capable of pouring and discharging an electrolytic solution; an ion exchange membrane disposed between the oxidation tank and the intermediate tank; a gas reduction sheet in which an ion exchange membrane and a reduction electrode are laminated and which is disposed between the reduction tank and the intermediate tank with the ion exchange membrane facing the intermediate tank and the reduction electrode facing the reduction tank; and a conducting wire connecting the oxidation electrode to the reduction electrode.
  • a carbon dioxide gas phase reduction method is a carbon dioxide gas phase reduction method performed by a carbon dioxide gas phase reduction device, the carbon dioxide gas phase reduction device including: an oxidation tank including an oxidation electrode: a reduction tank to which carbon dioxide is supplied; an intermediate tank that is disposed between the oxidation tank and the reduction tank and is capable of having an electrolytic solution poured thereinto and discharging the electrolytic solution; an ion exchange membrane disposed between the oxidation tank and the intermediate tank; a gas reduction sheet in which an ion exchange membrane and a reduction electrode are laminated and which is disposed between the reduction tank and the intermediate tank with the ion exchange membrane facing the intermediate tank and the reduction electrode facing the reduction tank; and a conducting wire connecting the oxidation electrode to the reduction electrode, in which the method includes performing a first step of pouring the electrolytic solution into the oxidation tank and supplying carbon dioxide to the reduction tank, and a second step of pouring the electrolytic solution into the intermediate tank only when the oxidation electrode is i
  • a carbon dioxide gas phase reduction method is a carbon dioxide gas phase reduction method performed by a carbon dioxide gas phase reduction device, the carbon dioxide gas phase reduction device including: an oxidation tank including an oxidation electrode; a reduction tank to which carbon dioxide is supplied; an intermediate tank that is disposed between the oxidation tank and the reduction tank and is capable of having an electrolytic solution poured thereinto and discharging the electrolytic solution; an ion exchange membrane disposed between the oxidation tank and the intermediate tank; a gas reduction sheet in which an ion exchange membrane and a reduction electrode are laminated and which is disposed between the reduction tank and the intermediate tank with the ion exchange membrane facing the intermediate tank and the reduction electrode facing the reduction tank; and a conducting wire connecting the oxidation electrode to the reduction electrode, in which the method includes performing a first step of pouring the electrolytic solution into the oxidation tank and supplying carbon dioxide to the reduction tank, and a second step of pouring the electrolytic solution into the intermediate tank only when a voltage is applied between the
  • the present invention it is possible to provide a technique capable of inhibiting deterioration of a reduction electrode and improving a lifespan of a carbon dioxide reduction reaction on the reduction electrode.
  • FIG. 1 is a configuration diagram showing a configuration of a carbon dioxide gas phase reduction device according to Examples 1 to 4.
  • FIG. 2 is a diagram showing a method for producing a gas reduction sheet using an electroless plating method.
  • FIG. 3 is a diagram showing a light irradiation time and a voltage application time used in Examples 1 and 5.
  • FIG. 4 is a diagram showing a light irradiation time and a voltage application time used in Examples 2 and 6.
  • FIG. 5 is a diagram showing a light irradiation time and a voltage application time used in Examples 3 and 7.
  • FIG. 6 is a diagram showing a light irradiation time and a voltage application time used in Examples 4 and 8.
  • FIG. 7 is a configuration diagram showing a configuration of a carbon dioxide gas phase reduction device according to Examples 5 to 8.
  • FIG. 8 is a configuration diagram showing a configuration of a conventional carbon dioxide gas phase reduction device.
  • the present invention is an invention relating to a carbon dioxide gas phase reduction device that causes a carbon dioxide reduction reaction by irradiating light or causes a carbon dioxide electrolytic reduction reaction to improve a lifespan of the reduction reaction and falls within the technical fields of fuel generation techniques and solar energy conversion techniques.
  • the present invention uses a gas reduction sheet in which a reduction electrode is directly formed on an ion exchange membrane and directly supplies gas phase carbon dioxide to a surface of the reduction electrode, and thus an intermediate tank capable of having an electrolytic solution poured thereinto and discharging the electrolytic solution is disposed between an oxidation tank and a reduction tank in a carbon dioxide gas phase reduction device that reduces carbon dioxide. Also, the electrolytic solution is poured into the intermediate tank and brought into contact with the reduction electrode to cause the carbon dioxide reduction reaction in the reduction electrode of the gas reduction sheet only when an oxidation electrode in the oxidation tank is irradiated with light or when a voltage is applied between the oxidation electrode and the reduction electrode.
  • FIG. 1 is a configuration diagram showing a configuration of a carbon dioxide gas phase reduction device according to Example 1.
  • a carbon dioxide gas phase reduction device includes an oxidation tank 2 including an oxidation electrode 1 , a reduction tank 3 to which carbon dioxide (CO 2 ) is supplied, an intermediate tank 4 that is disposed between the oxidation tank 2 and the reduction tank 3 and capable of having an electrolytic solution poured thereinto and discharging the electrolytic solution, an ion exchange membrane 5 disposed between the oxidation tank 2 and the intermediate tank 4 , a gas reduction sheet 100 in which an ion exchange membrane 6 and a reduction electrode 7 are laminated and which is disposed between the reduction tank 3 and the intermediate tank 4 with the ion exchange membrane 6 facing the intermediate tank 4 and the reduction electrode 7 facing the reduction tank 3 , a conducting wire 8 connecting the oxidation electrode 1 to the reduction electrode 7 , and a light source 9 irradiating the oxidation electrode 1 with light.
  • CO 2 carbon dioxide
  • the oxidation electrode 1 is configured by epitaxially growing a thin film of n-type gallium nitride (n-GaN), which is an n-type semiconductor, and aluminum gallium nitride (AlGaN) in the order of n-GaN and AlGaN on a sapphire substrate, and performing vacuum vapor deposition of nickel (Ni) and heat treatment thereon, thereby forming a co-catalyst thin film of nickel oxide (NiO).
  • n-GaN n-type gallium nitride
  • AlGaN aluminum gallium nitride
  • NiO nickel oxide
  • NiO is a catalyst layer
  • AlGaN is a light absorption layer.
  • This oxidation electrode 1 is installed to be immersed in an aqueous solution 10 which is the electrolytic solution poured into the oxidation tank 2 .
  • the aqueous solution 10 in the oxidation tank 2 is a 1 mol/L potassium hydroxide (KOH) aqueous solution.
  • the oxidation tank 2 and the intermediate tank 4 are separated from each other by the ion exchange membrane 5 .
  • An aqueous solution 11 serving as the electrolytic solution poured into the intermediate tank 4 is also a 1 mol/L potassium hydroxide aqueous solution.
  • the intermediate tank 4 and the reduction tank 3 are separated from each other by the gas reduction sheet 100 in which the reduction electrode 7 is directly formed on the ion exchange membrane 6 .
  • the ion exchange membrane 6 is disposed on the intermediate tank 4 side, and the reduction electrode 7 is disposed on the reduction tank 3 side.
  • Nafion (registered trademark) is used for both the ion exchange membrane 5 disposed between the oxidation tank 2 and the intermediate tank 4 and the ion exchange membrane 6 of the gas reduction sheet 100 disposed between the intermediate tank 4 and the reduction tank 3 .
  • Copper (Cu) is used for the reduction electrode 7 .
  • the oxidation electrode 1 immersed in the aqueous solution 10 in the oxidation tank 2 and the reduction electrode 7 of the gas reduction sheet 100 disposed toward the reduction tank 3 are connected to each other by the conducting wire 8 .
  • a 300 W high-pressure xenon lamp is used as the light source 9 .
  • Light output from the light source 9 in which wavelengths of 450 nm or more are cut, is used.
  • FIG. 2 is a diagram showing a reaction system of an electroless plating method used as a method for producing the gas reduction sheet 100 .
  • One surface of the ion exchange membrane 6 is polished. Further, in order to improve proton mobility of the ion exchange membrane 6 , the ion exchange membrane 6 is immersed in each of boiling nitric acid and boiling pure water.
  • Two left and right tanks 21 and 22 are filled with a plating solution 31 and a reduction agent 32 shown in Table 1, respectively.
  • the tank 21 and the tank 22 are separated from each other by the ion exchange membrane 6 .
  • the ion exchange membrane 6 is disposed with the polished surface facing the plating solution 31 side. Since NaBH 4 , which is a main component of the reduction agent 32 , is a polar compound, it permeates the ion exchange membrane 6 . The following oxidation-reduction reaction occurs and copper (Cu) is deposited at an interface between the plating solution 31 and the polished surface of the ion exchange membrane 6 , and thus the gas reduction sheet 100 in which the reduction electrode is formed on the ion exchange membrane 6 can be obtained.
  • a NiO-forming surface of the oxidation electrode 1 is fixed toward the light source 9 such that the NiO-forming surface of the oxidation electrode 1 serves as a light receiving surface (a first step).
  • a light receiving area of the oxidation electrode 1 was set to 3.8 cm 2 .
  • a tube 12 is put into the aqueous solution 10 in the oxidation tank 2 and helium (He) is flowed into the aqueous solution 10 at a flow rate of 5 ml/min, and carbon dioxide (CO 2 ) is flowed into the reduction tank 3 from a gas input port 13 at the same flow rate (a third step).
  • He helium
  • CO 2 carbon dioxide
  • the 1 mol/L potassium hydroxide aqueous solution 11 is poured into the intermediate tank 4 from the aqueous solution input port 14 , and the oxidation electrode 1 is uniformly irradiated with the light using the light source 9 (a fourth step).
  • the carbon dioxide reduction reaction proceeds at a three-phase interface configured of the ion exchange membrane (Nafion) 6 in the gas reduction sheet 100 , the reduction electrode (Cu) 7 , and gas phase carbon dioxide (CO 2 ).
  • a surface area of the reduction electrode 7 to which carbon dioxide is directly supplied is about 6.8 cm 2 .
  • the aqueous solution 11 is discharged from an aqueous solution output port 15 of the intermediate tank 4 (a fifth step).
  • the “first step” described in “Claims” corresponds to the second step and the third step.
  • the second step and the third step may be implemented at the same timing.
  • a step of flowing carbon dioxide into the reduction tank 3 may be carried out at a timing prior to the step of pouring the aqueous solution 10 into the oxidation tank 2 .
  • the “second step” described in “Claims” corresponds to the fourth step and the fifth step.
  • Example 1 the oxidation electrode 1 was irradiated with light having a profile-set illuminance as shown in FIG. 3 .
  • a process of “irradiating the oxidation electrode 1 with light having an illuminance of 2.2 mW/cm 2 in a wavelength region of 365 nm or more for 1 hour and then waiting for 1 hour without irradiating light” is repeated, and the reaction is caused to proceed until a net light irradiation time reaches 3 hours. Further, when the light irradiation is stopped, the aqueous solution 11 is discharged from the intermediate tank 4 , and when the light irradiation is started again, the aqueous solution 11 is poured into the intermediate tank 4 .
  • Concentration analysis of gas products in each reaction tank was performed using a gas chromatograph at an arbitrary time during the light irradiation.
  • a liquid product in the reduction tank 3 was subjected to the concentration analysis using a liquid chromatograph.
  • oxygen was generated in the oxidation tank 2 by the oxidation reaction of water using holes.
  • hydrogen was produced by the reduction reaction of protons using electrons, and carbon monoxide, formic acid, formaldehyde, methane, ethylene, methanol, and ethanol were produced by the reduction reaction of carbon dioxide.
  • Example 2 also uses the same carbon dioxide gas phase reduction device as in Example 1 shown in FIG. 1 .
  • the oxidation electrode 1 was irradiated with light having a profile-set illuminance as shown in FIG. 4 .
  • a process of “irradiating the oxidation electrode 1 with light having an illuminance of 2.2 mW/cm 2 in the wavelength region of 365 nm or more for 1 hour and then waiting for 3 hours without irradiating light” is repeated, and the reaction is caused to proceed until the net light irradiation time reaches 3 hours.
  • Example 3 also uses the same carbon dioxide gas phase reduction device as in Example 1 shown in FIG. 1 .
  • the oxidation electrode 1 was irradiated with light having a profile-set illuminance as shown in FIG. 5 .
  • a process of “irradiating the oxidation electrode 1 with light having an illuminance of 2.2 mW/cm 2 in the wavelength region of 365 nm or more for 1 hour and then waiting for 5 hours without irradiating light” is repeated, and the reaction is caused to proceed until the net light irradiation time reaches 3 hours.
  • Example 4 also uses the same carbon dioxide gas phase reduction device as in Example 1 shown in FIG. 1 .
  • the oxidation electrode 1 was irradiated with light having a profile-set illuminance as shown in FIG. 6 .
  • a process of “irradiating the oxidation electrode 1 with light having an illuminance of 2.2 mW/cm 2 in the wavelength region of 365 nm or more for 1 hour and then waiting for 10 hours without irradiating light” is repeated, and the reaction is caused to proceed until the net light irradiation time reaches 3 hours.
  • FIG. 7 is a configuration diagram showing a configuration of a carbon dioxide gas phase reduction device according to Example 5.
  • Example 5 a power source 16 is used instead of the light source 9 .
  • the power source 16 is inserted on a path of a conducting wire 8 .
  • the oxidation electrode 1 of Example 5 was configured by using platinum (manufactured by Nilaco Corporation). A surface area of the oxidation electrode 1 was set to about 0.55 cm 2 . Other configurations are the same as in Example 1.
  • the power source 16 was connected between the oxidation electrode 1 and the reduction electrode 7 with the conducting wire 8 , and a voltage of 1.5 V was applied to pass a current.
  • Other procedures are the same as in Example 1.
  • Example 5 a profile-set voltage was applied to the conducting wire 8 as shown in FIG. 3 .
  • a process of “applying a voltage of 1.5 V between the oxidation electrode 1 and the reduction electrode 7 for 1 hour and then waiting for 1 hour without applying a voltage” is repeated, and the reaction is caused to proceed until the net voltage application time reaches 3 hours. Further, when the application of the voltage is stopped, the aqueous solution 11 is discharged from the intermediate tank 4 , and when the voltage is applied again, the aqueous solution 11 is poured into the intermediate tank 4 .
  • Concentration analysis of gas products in each reaction tank was performed using a gas chromatograph at an arbitrary time while the voltage was applied.
  • a liquid product in the reduction tank 3 was subjected to the concentration analysis by a liquid chromatograph.
  • oxygen was generated in the oxidation tank 2 .
  • hydrogen, carbon monoxide, formic acid, formaldehyde, methane, ethylene, methanol and ethanol were produced in the reduction tank 3 .
  • Example 6 also uses the same carbon dioxide gas phase reduction device as in Example 5 shown in FIG. 7 .
  • a profile-set voltage was applied to the conducting wire 8 as shown in FIG. 4 .
  • a process of “applying a voltage of 1.5 V between the oxidation electrode 1 and the reduction electrode 7 for 1 hour and then waiting for 3 hours without applying a voltage” is repeated, and the reaction is caused to proceed until the net voltage application time reaches 3 hours. Further, when the application of the voltage is stopped, the aqueous solution 11 is discharged from the intermediate tank 4 , and when the voltage is applied again, the aqueous solution 11 is poured into the intermediate tank 4 . Other points are the same as in Example 5.
  • Example 1 also uses the same carbon dioxide gas phase reduction device as in Example 5 shown in FIG. 7 .
  • a profile-set voltage was applied to the conducting wire 8 as shown in FIG. 5 .
  • a process of “applying a voltage of 1.5 V between the oxidation electrode 1 and the reduction electrode 7 for 1 hour and then waiting for 5 hours without applying a voltage” is repeated, and the reaction is caused to proceed until the net voltage application time reaches 3 hours. Further, when the application of the voltage is stopped, the aqueous solution 11 is discharged from the intermediate tank 4 , and when the voltage is applied again, the aqueous solution 11 is poured into the intermediate tank 4 . Other points are the same as in Example 5.
  • Example 8 also uses the same carbon dioxide gas phase reduction device as in Example 5 shown in FIG. 7 .
  • a profile-set voltage was applied to the conducting wire 8 as shown in FIG. 6 .
  • a process of “applying a voltage of 1.5 V between the oxidation electrode 1 and the reduction electrode 7 for 1 hour and then waiting for 10 hours without applying a voltage” is repeated, and the reaction is caused to proceed until the net voltage application time reaches 3 hours. Further, when the application of the voltage is stopped, the aqueous solution 11 is discharged from the intermediate tank 4 , and when the voltage is applied again, the aqueous solution 11 is poured into the intermediate tank 4 . Other points are the same as in Example 5.
  • Example 1 the carbon dioxide gas phase reduction device shown in FIG. 1 is used as in Example 1.
  • the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time.
  • This configuration is the same as the conventional carbon dioxide gas phase reduction device shown in FIG. 8 .
  • Other points are the same as in Example 1.
  • Comparative example 2 the carbon dioxide gas phase reduction device shown in FIG. 1 is used. As compared with Example 2, the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time. Other points are the same as in Example 2.
  • Comparative example 3 the carbon dioxide gas phase reduction device shown in FIG. 1 is used. As compared with Example 3, the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time. Other points are the same as in Example 3.
  • Comparative example 4 the carbon dioxide gas phase reduction device shown in FIG. 1 is used. As compared with Example 4, the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time. Other points are the same as in Example 4.
  • Example 5 the carbon dioxide gas phase reduction device shown in FIG. 7 is used as in Example 5. As compared with Example 5, the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time. Other points are the same as in Example 5.
  • Comparative example 6 the carbon dioxide gas phase reduction device shown in FIG. 7 is used. As compared with Example 6, the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time. Other points are the same as in Example 6.
  • Comparative example 7 the carbon dioxide gas phase reduction device shown in FIG. 7 is used. As compared with Example 7, the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time. Other points are the same as in Example 7.
  • the carbon dioxide gas phase reduction device shown in FIG. 7 is used.
  • the intermediate tank 4 is always filled with the aqueous solution 11 regardless of the light irradiation time and the light stop time.
  • Other points are the same as in Example 8.
  • Table 2 shows a current retention rate of the carbon dioxide reduction when the net light irradiation time reaches 3 hours for Examples 1 to 8 and Comparative examples 1 to 8.
  • the current retention rate of the carbon dioxide reduction is calculated using Equation (1). It is considered that the larger the value of the current retention rate (%) of the carbon dioxide reduction, the longer the lifespan of the carbon dioxide reduction reaction.
  • Equation (2) When a concentration of a reduction reaction product is defined as A [ppm], a flow rate of a carrier gas is defined as B [L/sec], the number of electrons required for a reduction reaction is defined as Z [mol], a Faraday constant is defined as F [C/mol], and a molar body of a gas is V m [L/mol], the “current value of carbon dioxide reduction”, which is the right-hand variable of Equation (1), was calculated using Equation (2).
  • Examples 1 to 4 are compared with Comparative examples 1 to 4 in each case of the waiting time of 1 hour, 3 hours, 5 hours, and 10 hours at the time of light irradiation, it can be understood that the current retention rate of the carbon dioxide reduction in each example was improved as compared with each comparative example. Further, when Examples 5 to 8 are compared with Comparative examples 5 to 8 in each case of the waiting time of 1 hour, 3 hours, 5 hours, and 10 hours at the time of the voltage application, it can be understood that the current retention rate of the carbon dioxide reduction in each example was improved as compared with each comparative example as in the case of light irradiation.
  • the intermediate tank 4 capable of pouring and discharging the aqueous solution 11 , which is the electrolytic solution, is disposed between the oxidation tank 2 and the reduction tank 3 , and the reduction electrode 7 and the aqueous solution 11 are brought into contact with each other only when the oxidation electrode is irradiated with light or when a voltage is applied between the oxidation electrode and the reduction electrode, and thus recovery of oxygen generated by the oxidation electrode 1 is not hindered, deterioration of the reduction electrode 7 can be inhibited, and the lifespan of the carbon dioxide reduction reaction on the reduction electrode 7 can be improved.
  • the present invention is not limited to the above Examples 1 to 8, and many modifications can be made within the scope of the gist thereof.
  • the nitride semiconductors shown as the oxidation electrodes 1 of Examples 1 to 4 may have different laminated structures, or may have different compositions such as a composition containing indium and aluminum. Further, for the oxidation electrodes 1 of Examples 1 to 4, instead of the nitride semiconductors, compounds exhibiting photoactivity such as titanium oxide and amorphous silicon may be used.
  • the oxidation electrode 1 of Examples 5 to 8 may be a metal such as gold, silver, copper, indium, or nickel instead of platinum.
  • the reduction electrode 7 may be gold, platinum, silver, palladium, gallium, indium, nickel, tin, cadmium, an alloy thereof, or a mixture of these metals or metal oxides and carbon.
  • aqueous solutions 10 and 11 instead of the potassium hydroxide aqueous solution, a sodium hydroxide aqueous solution, a potassium chloride aqueous solution, or a sodium chloride aqueous solution may be used.
  • the ion exchange membrane 6 is, for example, a cation exchange membrane called Nafion, which is a perfluorocarbon material composed of a hydrophobic Teflon skeleton composed of carbon-fluorine and a perfluoro side chain having a sulfonic acid group.
  • the method for producing the gas reduction sheet may be an electroplating method, a physical vapor deposition method, or a chemical vapor deposition method, in addition to the electroless plating method.

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