WO2022244234A1 - 多孔質電極支持型電解質膜および多孔質電極支持型電解質膜の製造方法 - Google Patents

多孔質電極支持型電解質膜および多孔質電極支持型電解質膜の製造方法 Download PDF

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WO2022244234A1
WO2022244234A1 PCT/JP2021/019363 JP2021019363W WO2022244234A1 WO 2022244234 A1 WO2022244234 A1 WO 2022244234A1 JP 2021019363 W JP2021019363 W JP 2021019363W WO 2022244234 A1 WO2022244234 A1 WO 2022244234A1
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electrode
electrolyte membrane
porous
reduction
carbon dioxide
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English (en)
French (fr)
Japanese (ja)
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紗弓 里
裕也 渦巻
晃洋 鴻野
武志 小松
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Priority to PCT/JP2021/019363 priority Critical patent/WO2022244234A1/ja
Priority to JP2023522159A priority patent/JP7594215B2/ja
Priority to US18/554,303 priority patent/US20240183046A1/en
Publication of WO2022244234A1 publication Critical patent/WO2022244234A1/ja
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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
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/02—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
    • C25B11/03—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form perforated or foraminous
    • C25B11/031—Porous electrodes
    • 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
    • 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

Definitions

  • the present invention relates to a porous electrode-supported electrolyte membrane and a method for producing a porous electrode-supported electrolyte membrane.
  • Devices related to technologies for reducing carbon dioxide include a reduction device using artificial photosynthesis technology and a reduction device using electrolytic reduction technology.
  • Artificial photosynthesis technology is a technology that advances the oxidation reaction of water and the reduction reaction of carbon dioxide by irradiating an oxidation electrode made of a photocatalyst with light.
  • the electrolytic reduction technique is a technique for advancing the oxidation reaction of water and the reduction reaction of carbon dioxide by applying a voltage between an oxidation electrode and a reduction electrode made of metal.
  • Artificial photosynthesis technology using sunlight and electrolytic reduction technology using electricity derived from renewable energy can recycle carbon dioxide into hydrocarbons such as carbon monoxide, formic acid, and ethylene, and alcohols such as methanol and ethanol. has attracted attention as a technology capable of
  • Non-Patent Document 1 In artificial photosynthesis technology and carbon dioxide electrolytic reduction technology, a reaction system has been used in which a reduction electrode is immersed in an aqueous solution, and carbon dioxide dissolved in the aqueous solution is supplied to the reduction electrode for reduction (Non-Patent Document 1 , 2).
  • this method for reducing carbon dioxide there are limits to the concentration of carbon dioxide dissolved in the aqueous solution and the diffusion coefficient of carbon dioxide in the aqueous solution, which limits the amount of carbon dioxide supplied to the reduction electrode.
  • Non-Patent Document 3 by using a reactor having a structure that can supply gaseous carbon dioxide to the reduction electrode, the amount of carbon dioxide supplied to the reduction electrode increases, and the reduction reaction of carbon dioxide is promoted. be done.
  • the aqueous solution in the reduction tank is removed and the gas - phase carbon dioxide is filled. Therefore, it is necessary to bond the electrolyte membrane and the reduction electrode. Furthermore, since gaseous carbon dioxide cannot reach the interface between the reduction electrode and the electrolyte membrane only by bonding a plate-shaped reduction electrode to the electrolyte membrane, the reduction electrode is made porous so that gaseous carbon dioxide can reach the reduction electrode. It must be possible to reach the interface of the electrolyte membrane. This porous reduction electrode has a problem that if the pore diameter is small, the diffusion resistance of carbon dioxide in the electrode increases, and the efficiency of the reduction reaction of carbon dioxide decreases.
  • the electrolyte membrane When the electrolyte membrane is used as a proton exchange membrane, it is generally immersed in boiling nitric acid and boiling pure water in order to improve the proton mobility of the electrolyte membrane.
  • These treatments are treatments for replacing the proton-exchange groups in the electrolyte membrane with H + , but this treatment causes the electrolyte membrane to be in a swollen state with excessive water content. This is because the electrolyte membrane has a polymer reverse micelle structure, which swells and increases the water content.
  • the present invention has been made in view of the above, and aims to improve the gas phase reduction efficiency of carbon dioxide.
  • a porous electrode-supported electrolyte membrane of one aspect of the present invention is a porous electrode-supported electrolyte membrane used in a gas-phase reduction apparatus for reducing carbon dioxide, wherein the electrolyte membrane is directly bonded to the electrolyte membrane.
  • the porous reduction electrode has an average pore diameter of 1 ⁇ m or more.
  • a method for producing a porous electrode-supported electrolyte membrane according to one aspect of the present invention is a method for producing a porous electrode-supported electrolyte membrane used in a gas-phase reduction apparatus for reducing carbon dioxide, the electrolyte membrane comprising boiling nitric acid and boiling nitric acid.
  • the gas phase reduction efficiency of carbon dioxide can be improved.
  • FIG. 1 is a cross-sectional view showing an example of the configuration of the porous electrode-supported electrolyte membrane of this embodiment.
  • FIG. 2 is a flow chart showing an example of a method for producing a porous electrode-supported electrolyte membrane.
  • FIG. 3 is a view showing an example of thermocompression bonding when manufacturing a porous electrode-supported electrolyte membrane.
  • FIG. 4 is a diagram showing an example of the configuration of a gas-phase reduction apparatus for carbon dioxide provided with a porous electrode-supported electrolyte membrane.
  • FIG. 5 is a diagram showing an example of the configuration of another gas-phase reduction apparatus for carbon dioxide provided with a porous electrode-supported electrolyte membrane.
  • a porous electrode-supported electrolyte membrane 20 of this embodiment will be described with reference to the cross-sectional view of FIG.
  • the porous reduction electrode 5 is directly overlaid on the electrolyte membrane 6 and bonded by thermocompression.
  • the porous reduction electrode 5 preferably has an average pore size of 1 ⁇ m or more after thermocompression bonding.
  • the porous reduction electrode 5 is, for example, copper, platinum, gold, silver, indium, palladium, gallium, nickel, tin, cadmium, porous bodies of their alloys, silver oxide, copper oxide, copper (II) oxide , nickel oxide, indium oxide, tin oxide, tungsten oxide, tungsten (VI) oxide, copper oxide, or porous metal complexes having metal ions and anionic ligands.
  • the electrolyte membrane 6 is, for example, Nafion (registered trademark), Phorblue, or Aquivion, which is a perfluorocarbon material having a carbon-fluorine skeleton.
  • step S1 in order to reduce the proton conduction resistance of the electrolyte membrane 6, the electrolyte membrane 6 is immersed in boiling nitric acid and boiling pure water.
  • step S2 the porous reduction electrode 5 is superimposed on the electrolyte membrane 6, and is thermocompression bonded by a thermocompression bonding device (for example, a hot press machine).
  • a thermocompression bonding device for example, a hot press machine.
  • the porous reduction electrode 5 is placed on the electrolyte membrane 6 and placed between two copper plates 40a and 40b, and the electrolyte membrane 6 and the porous reduction electrode 5 are placed on the copper plate. It is thermocompression-bonded together with 40a and 40b by a thermocompression bonding device.
  • the heating temperature is preferably 100°C or higher and lower than 180°C.
  • the electrolyte membrane 6 and the porous reduction electrode 5 are joined together by rapid cooling to obtain the porous electrode-supported electrolyte membrane 20 .
  • the gas-phase reduction device 100 shown in FIG. 4 is a reduction device that uses artificial photosynthesis technology to reduce carbon dioxide by light irradiation.
  • the gas-phase reduction apparatus 100 includes an oxidation tank 1 and a reduction tank 4, which are formed by dividing the internal space in the housing into two by the porous electrode-supported electrolyte membrane 20.
  • the porous electrode-supported electrolyte membrane 20 is arranged with the electrolyte membrane 6 facing the oxidation tank 1 and the reduction electrode 5 facing the reduction tank 4 .
  • the oxidation tank 1 is filled with an aqueous solution 3.
  • An oxidation electrode 2 made of a semiconductor or a metal complex is inserted into an aqueous solution 3 .
  • the oxidation electrode 2 is, for example, a compound exhibiting photoactivity and redox activity such as nitride semiconductor, titanium oxide, amorphous silicon, ruthenium complex, and rhenium complex.
  • the oxidation electrode 2 is electrically connected to the porous reduction electrode 5 by a conductor 7 .
  • the aqueous solution 3 is, for example, an aqueous potassium hydrogen carbonate solution, an aqueous sodium hydrogen carbonate solution, an aqueous potassium chloride solution, an aqueous sodium chloride solution, an aqueous sodium hydroxide solution, an aqueous potassium hydroxide solution, an aqueous rubidium hydroxide solution, or an aqueous cesium hydroxide solution.
  • Helium gas is supplied to the aqueous solution 3 from the tube 8 during the reduction reaction.
  • the reduction tank 4 is supplied with carbon dioxide from the gas inlet 10 and filled with carbon dioxide or a gas containing carbon dioxide.
  • a light source 9 is arranged so that the oxidation electrode 2 is irradiated with light.
  • the light source 9 is, for example, a xenon lamp, a simulated solar light source, a halogen lamp, a mercury lamp, and sunlight.
  • the light source 9 may be configured by combining these.
  • Example of porous electrode-supported electrolyte membrane As the porous electrode-supported electrolyte membrane 20 to be placed in the gas phase reduction apparatus 100, Example 1-6 was prepared by changing the average pore diameter or the heating temperature during the thermocompression treatment, and the gas phase reduction test described later was performed. gone. The porous electrode-supported electrolyte membranes of Examples 1-6 are described below.
  • Example 1 a copper porous body having a thickness of 0.2 mm and a porosity of 65% was used as the material of the porous reduction electrode 5 , and Nafion, which is a proton exchange membrane, was used as the material of the electrolyte membrane 6 .
  • step S1 the electrolyte membrane 6 was immersed in boiling nitric acid and boiling pure water in order to reduce the resistance of proton conduction. It was confirmed that this treatment reduced the proton conduction resistance of the electrolyte membrane 6 from 3.0 to 3.5 ⁇ .
  • step S2 the sample in which the porous reduction electrode 5 is stacked on the electrolyte membrane 6 is sandwiched between two copper plates and a hot press, and the surface of the porous reduction electrode 5 is heated at a heating temperature of 150 ° C. Pressure was applied vertically and left for 3 minutes. After that, the sample was quickly cooled and taken out to obtain a porous electrode-supported electrolyte membrane 20 in which the electrolyte membrane 6 and the porous reduction electrode 5 were joined.
  • the thickness of the porous reduction electrode 5 after thermocompression bonding was 0.14 mm, the porosity was 50%, and the average pore diameter was 1.3 ⁇ m.
  • Example 2 a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 79% as the material of the porous reduction electrode 5 .
  • the porous reduction electrode 5 after thermocompression bonding had a thickness of 0.14 mm, a porosity of 70%, and an average pore diameter of 15 ⁇ m. All other conditions are the same as in Example 1.
  • Example 3 a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 .
  • the porous reduction electrode 5 after thermocompression bonding had a thickness of 0.14 mm, a porosity of 90%, and an average pore diameter of 97 ⁇ m. All other conditions are the same as in Example 1.
  • Example 4 In Example 4, as in Example 3, a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 .
  • the heating temperature was set to 100° C. when applying pressure with a hot press. All the conditions other than the heating temperature are the same as in Example 3.
  • Example 5 In Example 5, as in Example 3, a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 . A heating temperature was set to 120° C. when applying pressure with a hot press. All the conditions other than the heating temperature are the same as in Example 3.
  • Example 6 a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 .
  • a heating temperature was set to 180° C. when applying pressure with a hot press. All the conditions other than the heating temperature are the same as in Example 3.
  • the oxidation tank 1 was filled with the aqueous solution 3.
  • Aqueous solution 3 was a 1.0 mol/L potassium hydroxide aqueous solution.
  • the oxidation electrode 2 was installed in the oxidation tank 1 so as to be submerged in the aqueous solution 3.
  • a semiconductor photoelectrode manufactured as follows was used as the oxidation electrode 2 .
  • a thin film of GaN, which is an n-type semiconductor, and AlGaN were epitaxially grown in this order on a sapphire substrate, Ni was vacuum-deposited on AlGaN, and heat treatment was performed to form a NiO promoter thin film to produce a semiconductor photoelectrode.
  • a 300 W high pressure xenon lamp (wavelength of 450 nm or more was cut, illuminance 6.6 mW/cm 2 ) was used.
  • the light source 9 was fixed so that the surface of the oxidation electrode 2 on which the oxidation co-catalyst was formed became the irradiation surface.
  • the light irradiation area of the oxidation electrode 2 was set to 2.5 cm 2 .
  • He Helium
  • CO 2 carbon dioxide
  • the reduction reaction of carbon dioxide can proceed at the three-phase interface of [electrolyte membrane-copper-gas phase carbon dioxide] in the porous electrode-supported electrolyte membrane 20 .
  • the apparent area of the porous reduction electrode 5 directly supplied with carbon dioxide is about 6.25 cm 2 .
  • the light source 9 was used to uniformly irradiate the oxidation electrode 2 with light. Electrons flow between the oxidation electrode 2 and the porous reduction electrode 5 due to light irradiation.
  • the current value between the oxidation electrode 2 and the porous reduction electrode 5 during light irradiation was measured using an electrochemical measuring device (1287 type potentiogalvanostat manufactured by Solartron).
  • the gas and liquid in the oxidation tank 1 and the reduction tank 4 were sampled at arbitrary times during the light irradiation, and the reaction products were analyzed with a gas chromatograph, a liquid chromatograph, and a gas chromatograph-mass spectrometer. As a result, it was confirmed that oxygen was produced in the oxidation tank 1, and hydrogen, carbon monoxide, formic acid, methane, methanol, ethanol, and ethylene were produced in the reduction tank 4.
  • the vapor-phase reduction device 200 shown in FIG. 5 is a reduction device that uses an electrolytic reduction technique for reducing carbon dioxide by passing an electric current between an oxidation electrode and a reduction electrode.
  • the gas-phase reduction apparatus 200 includes an oxidation tank 1 and a reduction tank 4, which are formed by dividing the internal space in the housing into two by the porous electrode-supported electrolyte membrane 20.
  • the porous electrode-supported electrolyte membrane 20 is arranged with the electrolyte membrane 6 side facing the oxidation tank 1 and the reduction electrode 5 side facing the reduction tank 4 .
  • the oxidation tank 1 is filled with an aqueous solution 3.
  • An oxidation electrode 2 made of a semiconductor or a metal complex is inserted into an aqueous solution 3 .
  • the oxidation electrode 2 is, for example, platinum, gold, silver, copper, indium, or nickel.
  • the aqueous solution 3 is the same as in the vapor phase reduction apparatus 100 of FIG.
  • the reduction tank 4 is supplied with carbon dioxide from the gas inlet 10 and filled with carbon dioxide or a gas containing carbon dioxide.
  • a power supply 11 is electrically connected to the oxidation electrode 2 and the porous reduction electrode 5 by a conductor 7 .
  • Examples 7 to 12 were prepared by changing the average pore diameter or the temperature during the thermocompression bonding, and the gas phase reduction test described later was performed. rice field.
  • the porous electrode-supported electrolyte membranes of Examples 7 to 12 are described below.
  • the porous electrode-supported electrolyte membranes 20 of Examples 7-12 were prepared in the same manner as the porous electrode-supported electrolyte membranes 20 of Examples 1-6.
  • Example 7 A porous electrode-supported electrolyte membrane 20 of Example 7 was produced in the same procedure as in Example 1. The heating temperature during thermocompression bonding was 150° C., and the porous reduction electrode 5 after thermocompression bonding had a thickness of 0.14 mm, a porosity of 50%, and an average pore diameter of 1.3 ⁇ m.
  • Example 8 a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 79% as the material of the porous reduction electrode 5 .
  • the porous reduction electrode 5 after thermocompression bonding had a thickness of 0.14 mm, a porosity of 70%, and an average pore diameter of 15 ⁇ m. All other conditions are the same as in Example 7.
  • Example 9 a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 .
  • the porous reduction electrode 5 after thermocompression bonding had a thickness of 0.14 mm, a porosity of 90%, and an average pore diameter of 97 ⁇ m. All other conditions are the same as in Example 7.
  • Example 10 a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 .
  • the heating temperature was set to 100° C. when applying pressure with a hot press. All the conditions other than the heating temperature are the same as in Example 9.
  • Example 11 In Example 11, as in Example 9, a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 . A heating temperature was set to 120° C. when applying pressure with a hot press. All the conditions other than the heating temperature are the same as in Example 9.
  • Example 12 a porous electrode-supported electrolyte membrane 20 was produced using a copper porous body having a thickness of 0.2 mm and a porosity of 93% as the material of the porous reduction electrode 5 .
  • a heating temperature was set to 180° C. when applying pressure with a hot press. All the conditions other than the heating temperature are the same as in Example 9.
  • the oxidation tank 1 was filled with the aqueous solution 3.
  • Aqueous solution 3 was a 1.0 mol/L potassium hydroxide aqueous solution.
  • the oxidation electrode 2 was placed in the oxidation tank 1 such that about 0.55 cm 2 of its surface area was submerged in the aqueous solution 3 . Platinum (manufactured by Nilaco Corporation) was used for the oxidation electrode 2 .
  • He Helium
  • CO 2 carbon dioxide
  • the reduction reaction of carbon dioxide can proceed at the three-phase interface of [electrolyte membrane-copper-gas phase carbon dioxide] in the porous electrode-supported electrolyte membrane 20 .
  • the apparent area of the porous reduction electrode 5 directly supplied with carbon dioxide is about 6.25 cm 2 .
  • the current value between the oxidation electrode 2 and the porous reduction electrode 5 during voltage application was measured using an electrochemical measurement device.
  • the gas and liquid in the oxidation tank 1 and the reduction tank 4 were sampled at arbitrary times during voltage application, and the reaction products were analyzed with a gas chromatograph, a liquid chromatograph, and a gas chromatograph-mass spectrometer. As a result, it was confirmed that oxygen was produced in the oxidation tank 1, and hydrogen, carbon monoxide, formic acid, methane, methanol, ethanol, and ethylene were produced in the reduction tank 4.
  • Comparative Examples 1-4 having different average pore diameters or temperatures during thermocompression bonding from those of the Examples were produced, and Comparative Examples 1 and 2 were prepared as the porous electrode-supported electrolyte membrane 20 of the vapor-phase reduction apparatus 100 of FIG. , Comparative Examples 3 and 4 were arranged as the porous electrode-supported electrolyte membrane 20 of the gas phase reduction apparatus 200 of FIG. .
  • Comparative Example 1 a porous electrode-supported electrolyte membrane was produced in the same manner as in Example 1 using a copper porous body having a thickness of 0.2 mm and a porosity of 51%. After thermocompression bonding, the porous reduction electrode had a thickness of 0.14 mm, a porosity of 30%, and an average pore diameter of 0.11 ⁇ m. All other conditions are the same as in Example 1.
  • Comparative Example 3 a porous electrode-supported electrolyte membrane was produced in the same manner as in Example 7 using a copper porous body having a thickness of 0.2 mm and a porosity of 51%. After thermocompression bonding, the porous reduction electrode had a thickness of 0.14 mm, a porosity of 30%, and an average pore diameter of 0.11 ⁇ m. All other conditions are the same as in Example 7.
  • Example 1-12 and Comparative Example 1-4 [Evaluation of Examples and Comparative Examples] Next, the test results of Example 1-12 and Comparative Example 1-4 will be described. Table 1 shows the Faradaic efficiency of the carbon dioxide reduction reaction after 1 hour and the Faradaic efficiency maintenance rate of the carbon dioxide reduction reaction after 20 hours for Examples 1-12 and Comparative Example 1-4.
  • the Faraday efficiency indicates the ratio of the current value used for each reduction reaction to the current value flowing between the electrodes during light irradiation or voltage application.
  • the "charge consumed in each reduction reaction” in formula (6) can be obtained by converting the measured value of the amount of the reaction product of each reduction reaction into the charge required for the reduction reaction.
  • the amount of reaction product of each reduction reaction is A [mol]
  • the number of electrons required for the reduction reaction is Z
  • the Faraday constant is F [C/mol]
  • Faradaic efficiency maintenance rate [%] of each reduction reaction after 20 hours (Faraday efficiency of each reduction reaction after 20 hours) / (Faraday efficiency of each reduction reaction after 1 hour) x 100 (8)
  • Table 1 shows evaluation results of the diffusion coefficient of carbon dioxide in the porous electrode depending on the pore diameter. According to this, in Examples 1-5 and 7-11, which have a pore diameter of more than 1 ⁇ m, the saturation value of 6.0 ⁇ 10 ⁇ 6 m 2 s ⁇ 1 (self-diffusion coefficient) is reached. It was found to be 1.5 times.
  • porous electrode-supported electrolyte membrane 20 composed of a porous electrode having an average pore diameter of 1 ⁇ m or more at which the diffusion coefficient of carbon dioxide reaches the saturation value allows carbon dioxide to be transferred to the porous reduction electrode 5.
  • the amount of supply increased, and the efficiency of the carbon dioxide reduction reaction was improved.
  • Table 1 shows the measured proton conduction resistance of the electrolyte membrane 6 .
  • the resistance was as low as 3.0 to 3.5 ⁇ , and it was confirmed that the effect of reducing the proton conduction resistance was not lost even after the thermocompression bonding.
  • the ion conduction resistance of the electrolyte membrane 6 increased to 360 ⁇ .
  • the current value between the electrodes was remarkably low, and the amount of the reaction product fell below the lower detection limit (3%) of the evaluation system. It is considered that this is because the proton exchange group of the electrolyte membrane was decomposed by performing the thermocompression bonding treatment at a high temperature condition of 180°C.
  • the porous electrode-supported electrolyte membrane 20 of this embodiment has the electrolyte membrane 6 and the porous reduction electrode 5 directly bonded onto the electrolyte membrane 6,
  • the average pore size of the porous reduction electrode 5 is set to 1 ⁇ m or more.
  • Porous electrode-supported electrolyte membrane 20 Porous reduction electrode 5 electrolyte membrane 6

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PCT/JP2021/019363 2021-05-21 2021-05-21 多孔質電極支持型電解質膜および多孔質電極支持型電解質膜の製造方法 Ceased WO2022244234A1 (ja)

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JP2023522159A JP7594215B2 (ja) 2021-05-21 2021-05-21 多孔質電極支持型電解質膜および多孔質電極支持型電解質膜の製造方法
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