A high-value CO2 gas conversion device based on micro-high-voltage electrochemical technology

Abstract

The present invention relates to a high-value CO2 gas conversion device based on micro-high-voltage electrochemical technology. The device includes a heating device, a sealed housing, a working electrode, a counter electrode, a reference electrode, and a stirring device. The heating device is arranged to surround the sealed housing. The sealed housing is provided with a cathode chamber and an anode chamber. The cathode chamber contains homoacetogenic bacteria or methanogenic bacteria. The working electrode and the reference electrode extend from the outside of the top cover of the sealed housing into the cathode chamber. The counter electrode extends from the outside of the top cover of the sealed housing into the anode chamber. The stirring device extends from the outside of the top cover of the sealed housing into the cathode chamber and the anode chamber, respectively. The top cover of the sealed housing is provided with liquid inlets and gas inlets and outlets, which are connected to the cathode chamber and the anode chamber. The device uses water and CO2 / CO as raw materials to produce high-value chemicals through microbial electrosynthesis.

Description

Technical Field

[0001] The present invention relates to, but is not limited to, the technical field of electrochemical electrolytic cells, and in particular to a CO2 gas high-value conversion device based on micro-high voltage electrochemical technology. Background Art

[0002] Global warming caused by greenhouse gas emissions has become a highly concerning environmental and climate issue both domestically and internationally. CO2 fixation, reduction, and high-value conversion are key areas of carbon emission reduction. On the other hand, the development and utilization of new energy sources such as solar and wind power can significantly reduce fossil fuel use and CO2 emissions. However, the imbalance between renewable energy generation and electricity consumption results in a considerable amount of electricity being wasted and difficult to utilize. Utilizing waste electricity generated by abandoned solar and electricity sources to achieve high-value CO2 conversion can significantly improve the efficiency of new energy facilities.

[0003] Electrochemical reactions can use clean energy to convert CO2, CO, etc. into chemical products with higher added value, such as acetic acid, ethanol, etc., while also avoiding the exogenous addition of H2. Therefore, it has great significance for the sustainable development of the environment and energy. For gas fermentation, the low gas-liquid mass transfer rate becomes its rate-limiting step. Existing atmospheric pressure electrolysis cells are difficult to quickly convert gas substrates into products, while micro-high pressure can increase the solubility of gas in water and improve the CO2 gas conversion efficiency. In addition, as a new method for bio-electrosynthesis of acetic acid, microorganisms can obtain electrons directly or indirectly; H + Through the proton pump into the cell for direct use, it avoids the formation of H2 escaping into the gas phase and then being used by microorganisms, which is expected to solve the problem of H2 gas-liquid mass transfer. In addition, CO2 gas-liquid mass transfer is a factor that affects the storage efficiency (R) of MEC electrical energy into chemical energy (acetic acid). E→C ) is an important rate-limiting step. Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.

[0005] The present application provides a high-value gas conversion device based on micro-high-voltage electrochemical technology. The high-value gas conversion device uses water and CO2 / CO as raw materials. Under the action of microorganisms, it produces H2, formic acid, acetic acid and other products through micro-high-voltage electricity, and can further synthesize high-value chemicals. The device uses micro-high-voltage technology to increase the solubility of gas in the liquid phase through pressure, thereby increasing the concentration of reactants and increasing the contact area between gas and catalyst (such as microorganisms), thereby improving the gas-liquid mass transfer efficiency during the gaseous fermentation process, and maximizing energy conversion efficiency.

[0006] The present application provides a high-value CO2 gas conversion device based on micro-high voltage electrochemical technology, the device including a heating device, a sealed shell, a working electrode, a counter electrode, a reference electrode and a stirring device, the heating device is arranged to surround the sealed shell, the sealed shell is provided with a cathode chamber and an anode chamber, the cathode chamber contains homoacetogenic bacteria or methanogenic bacteria, the working electrode and the reference electrode extend from the outside of the top cover of the sealed shell to the outside of the cathode chamber, the counter electrode extends from the outside of the top cover of the sealed shell to the outside of the anode chamber, the stirring device extends from the outside of the top cover of the sealed shell to the cathode chamber and the anode chamber respectively, and a liquid inlet and outlet and an air inlet and outlet for connecting a gas pipeline are provided on the top cover of the sealed shell, and the liquid inlet and outlet and the air inlet and outlet are connected to the cathode chamber and the anode chamber.

[0007] In an embodiment of the present application, the homoacetogenic bacteria is selected from the genera Sporomusa, Clostridium, Moorella and Acetobacterium, such as Sporomusa ovata, Clostridium ljundgahlii, Clostridium thermoaceticum, Mooreella thermoacetica or Acetobacterium woodii.

[0008] In an embodiment of the present application, the methanogen is selected from the genus Methanosarcina and the genus Methanosaeta, such as Methanosarcina barkeri, Methanosarcina acetivorans or Methanosaetaconcilii.

[0009] In an embodiment of the present application, pressure gauges are provided on the inlet and outlet valves of the gas pipeline to monitor the pressures in the cathode chamber and the anode chamber.

[0010] In an embodiment of the present application, a clamping plate is provided between the cathode chamber and the anode chamber.

[0011] In an embodiment of the present application, the clamping plate is composed of two hollow cylinders placed horizontally and opposite to each other, and matching grooves and protrusions are respectively provided on the parts of the two hollow cylinders that contact each other. A proton exchange membrane is provided between the two hollow cylinders, and the edges of the proton exchange membrane are clamped by the grooves and the protrusions.

[0012] In an embodiment of the present application, the inner diameters of the two hollow cylinders are variable so as to match the proton exchange membranes of different sizes.

[0013] In an embodiment of the present application, the proton exchange membrane is optionally replaced by a cation exchange membrane or an anion exchange membrane.

[0014] In an embodiment of the present application, the working electrode, the reference electrode and the counter electrode are respectively connected to an external power source through the conductive metal rod.

[0015] In an embodiment of the present application, the conductive metal rod is provided with threads, and the working electrode, the counter electrode, and the reference electrode are connected to the conductive metal rod via the threads.

[0016] In an embodiment of the present application, the working electrode is made of carbon felt or carbon cloth, the counter electrode is made of graphite sheet, and the reference electrode is a silver / silver chloride electrode or a saturated calomel electrode.

[0017] In an embodiment of the present application, the device also includes a gas control system, which includes a pressure sensor, a flow rate control device and a safety valve, which are used to adjust and control the gas pressure in the cathode chamber and the anode chamber respectively to ensure the pressure balance in the cathode chamber and the anode chamber.

[0018] In an embodiment of the present application, the device further comprises a temperature probe, wherein the temperature probe extends from above the top cover of the sealed housing into the cathode chamber and the anode chamber.

[0019] In an embodiment of the present application, the apparatus further comprises a controller configured to control the temperature and stirring rate in the cathode chamber and the anode chamber.

[0020] In an embodiment of the present application, the device further comprises a pH detector and a gas composition monitor, wherein the pH detector and the gas composition monitor extend from the outside of the sealed housing into the cathode chamber and the anode chamber respectively.

[0021] In an embodiment of the present application, a safety valve is further provided on the sealed housing, and the operating pressure range of the safety valve is not greater than 8 MPa, preferably not greater than 6 MPa.

[0022] According to the present invention, a gas high-value conversion device based on micro-high-voltage electrochemical technology adopts a three-electrode system of a working electrode, a counter electrode, and a reference electrode. Inlet and outlet valves for connecting a high-pressure gas pipeline are provided on the top cover of the sealed shell, so that the interior of the sealed shell can be pressurized through the inlet and outlet valves, thereby adjusting the internal pressure of the sealed shell.

[0023] According to the present invention, a high-value gas conversion device based on micro-high-voltage electrochemical technology uses water and CO2 / CO as raw materials. Under the action of microorganisms, micro-high-voltage electricity is applied to produce products such as H2, formic acid, and acetic acid, and can further synthesize high-value chemicals. This technology has the characteristics of a wide range of applications and abundant raw material resources. It can be optimized and equipped with production equipment for users with various product and scale requirements. In particular, it can achieve energy conversion and storage while reducing carbon emissions in areas with relatively abundant clean energy such as wind power and solar power, as well as near factories with high carbon emissions.

[0024] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. Other advantages of the present application can be realized and obtained by the solutions described in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional view of a gas high-value conversion device using micro-high-voltage electrochemical technology provided by the present invention;

[0026] Figure 2 This is a schematic diagram of a membrane sandwich panel of a gas high-value conversion device using a micro-high-voltage electrochemical technology provided by the present invention;

[0027] Figure 3 This is a schematic top view of the top cover structure of the gas high-value conversion device using the micro-high-voltage electrochemical technology provided by the present invention.

[0028] The reference numerals in the drawings of the specification are as follows:

[0029] 1- heating device, 2- anode chamber, 3- top cover, 4- anode liquid inlet and outlet, 5- anode gas inlet and outlet, 6- anode pressure gauge, 7- anode safety valve, 8- temperature detector, 9- anode stirring device, 10- anode counter electrode, 11- external power supply, 12- cathode working electrode, 13- cathode reference electrode, 14- cathode stirring device, 15- cathode safety valve, 16- cathode pressure gauge, 17- cathode gas inlet and outlet, 18- cathode liquid inlet and outlet, 19- Cathode chamber, 20- splint, 21- proton exchange membrane, 22- groove (for placing membrane), 23- screw hole (for sealing the top cover and chamber), 24- hole (for inlet and outlet of gas / liquid / electrode, etc.), 25- stirring device hole, 26- stainless steel sealing shell, 27- protrusion, 28- controller, 29- pH detector, 30- gas composition monitor, 31- gas control system, 32- pressure sensor, 33- flow rate control device, 34- control panel.

[0030] Among them: the sealed shell 26 is composed of an anode chamber 2, a cathode chamber 19 and a top cover 3; the controller 28 is installed in a control panel 34 outside the heating system, and the controller 28 is coupled with the anode stirring device 9 and the cathode stirring device 14, the temperature detector 8 in the chamber and the heating device 1 to achieve the purpose of feedback control; the gas control system 31 is installed in the control panel 34 outside the heating device, and the gas control system 31 is formed by coupling the anode inlet and outlet 5, the cathode inlet and outlet 17 and the pressure sensor 32 to achieve the purpose of feedback and control. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions and advantages of this application more clear, the embodiments of this application will be described in detail below. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other in any way.

[0032] In the description of the present invention, it should be understood that the terms "above", "below", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] The machinery, electrical parts, electronic components, materials, etc. used in the gas high-value conversion device based on micro-high voltage electrochemical technology of the present invention are all commercially available.

[0035] refer to Figure 1-Figure 3An embodiment of the present invention provides a high-value CO2 gas conversion device based on micro-high-voltage electrochemical technology, which includes a heating device 1, a sealed shell 26, a working electrode 12, a counter electrode 10, a reference electrode 13 and stirring devices 9 and 14. The heating device 1 is configured to surround the sealed shell 26, and the sealed shell 26 is provided with a cathode chamber 19, an anode chamber 2 and a top cover 3. The cathode chamber 19 contains homoacetogenic bacteria or methanogenic bacteria. The working electrode 12 and the reference electrode 13 extend from the outside of the top cover 3 of the sealed shell to the outside of the cathode chamber 19. The counter electrode 10 extends from the outside of the top cover 3 of the sealed shell. To the outside of the anode chamber 2, the stirring devices 9 and 14 extend from the stirring device hole 25 outside the top cover 3 of the sealed shell to the cathode chamber 19 and the anode chamber 2 respectively, and the anode liquid inlet and outlet 4 and the cathode liquid inlet and outlet 18 and the anode gas inlet and outlet 5 and the cathode gas inlet and outlet 17 for connecting the gas pipeline are provided on the top cover 3 of the sealed shell. Gas can be introduced into the interior of the anode chamber 2 and the cathode chamber 19 through the anode gas inlet and outlet 5 and the cathode gas inlet and outlet 17 for pressurization, and the anode liquid inlet and outlet 4 and the cathode liquid inlet and outlet 18 as well as the anode gas inlet and outlet 5 and the cathode gas inlet and outlet 17 are connected to the anode chamber 2 and the cathode chamber 19.

[0036] In some embodiments, the gas introduced through the anode gas inlet and outlet 5 and the cathode gas inlet and outlet 17 is one or more of nitrogen, carbon dioxide, hydrogen, oxygen, carbon monoxide, biogas or methane.

[0037] The gas introduced through the anode gas inlet and outlet 5 and the cathode gas inlet and outlet 17 may not participate in the reaction and is only used to provide a pressure reaction environment, or it may participate in the reaction. When the gas introduced through the anode gas inlet and outlet 5 and the cathode gas inlet and outlet 17 participates in the reaction, different microbial electrochemical reactions can be carried out depending on the gas introduced.

[0038] In one embodiment, the reaction uses water and CO2 / CO as raw materials. Under the action of microorganisms, micro-high voltage electricity is applied to produce products such as H2, formic acid, and acetic acid, which can be further synthesized into high-value chemicals. This device uses micro-high pressure technology to increase the solubility of gases in the liquid phase through pressure, thereby increasing the concentration of reactants and the contact area between the gas and the catalyst (such as microorganisms). This improves the gas-liquid mass transfer efficiency during the gaseous fermentation process and maximizes energy conversion efficiency.

[0039] In an embodiment, the homoacetogenic bacteria is selected from the group consisting of Sporomusa, Clostridium, Moorella and Acetobacterium, such as Sporomusa ovata, Clostridium ljundgahlii, Clostridium thermoaceticum, Mooreella thermoacetica or Acetobacterium woodii.

[0040] In an embodiment, the methanogen is selected from the genus Methanosarcina and Methanosaeta, such as Methanosarcina barkeri, Methanosarcina acetivorans or Methanosaeta concilii.

[0041] In some embodiments, pressure gauges 6 and 16 are provided on the inlet and outlet valves of the gas pipeline to monitor the pressures in the cathode chamber 19 and the anode chamber 2 .

[0042] In some embodiments, a clamping plate 20 is provided between the cathode chamber 19 and the anode chamber 2 .

[0043] In some embodiments, the clamping plate 20 is composed of two hollow cylinders placed horizontally and opposite to each other, and matching grooves 22 and protrusions 27 are respectively provided on the contact parts of the two hollow cylinders. A proton exchange membrane 21 is provided between the two hollow cylinders, and the edges of the proton exchange membrane 21 are clamped by the grooves 22 and the protrusions 27.

[0044] In some embodiments, the inner diameters of the two hollow cylinders are variable to match the proton exchange membranes 21 of different sizes.

[0045] In some embodiments, the proton exchange membrane 21 is replaced by a cation exchange membrane or an anion exchange membrane.

[0046] In some embodiments, the working electrode 12 , the reference electrode 13 , and the counter electrode 10 are respectively connected to the external power supply 11 via conductive metal rods.

[0047] In some embodiments, the conductive metal rod is provided with threads, and the working electrode 12 , the counter electrode 10 , and the reference electrode 13 are connected to the conductive metal rod via the threads.

[0048] In some embodiments, the working electrode 12 is made of carbon felt or carbon cloth, the counter electrode 10 is made of graphite sheet, and the reference electrode 13 is a silver / silver chloride electrode or a saturated calomel electrode.

[0049] In some embodiments, the device also includes a gas control system 31, which includes a pressure sensor 32, a flow rate control device 33 and safety valves 7 and 15, which respectively adjust and control the gas pressure in the cathode chamber and the anode chamber to ensure the pressure balance in the cathode chamber and the anode chamber.

[0050] In some embodiments, the device further includes a temperature probe 8 , which extends from above the top cover 3 of the sealed housing into the cathode chamber 19 and the anode chamber 2 .

[0051] In some embodiments, the apparatus further comprises a controller 28 configured to control the temperature and stirring rate in the cathode chamber 19 and the anode chamber 2 .

[0052] In some embodiments, the apparatus further includes a pH detector 29 and a gas composition monitor 30 , which extend from the top cover 3 on the sealed housing 26 into the cathode chamber 19 and the anode chamber 2 , respectively.

[0053] In some embodiments, the sealed housing 26 is further provided with an anode safety valve 7 and a cathode safety valve 15. The operating pressure range of the anode safety valve 7 and the cathode safety valve 15 is not greater than 8 MPa, preferably not greater than 6 MPa.

[0054] The anode safety valve 7 and the cathode safety valve 15 are used to improve the safety of the gas high-value conversion device of the micro-high-voltage electrochemical technology. Since the gas high-value conversion device of the micro-high-voltage electrochemical technology is mainly used for micro-high-voltage electrosynthesis reaction, it is in a high-pressure state during the reaction process. At the same time, some reactions inevitably generate gas. In order to avoid excessive pressure exceeding the bearing limit of the sealed shell and causing an explosion accident, an anode safety valve 7 and a cathode safety valve 15 are provided. When the pressure exceeds the limit value, the anode safety valve 7 and the cathode safety valve 15 can automatically relieve the pressure of the anode chamber 2 and the cathode chamber 19 respectively, thereby avoiding the occurrence of explosion and reducing safety hazards.

[0055] In some embodiments, the working electrode 12 , the counter electrode 10 , the reference electrode 13 , the gas inlet and outlet 5 , 17 , the liquid inlet and outlet 4 , 18 , and the stirring devices 9 , 14 are all disposed on the top cover 3 .

[0056] In some embodiments, the reaction pressure can be determined based on the specific microbial activity and whether the pH of the cathode chamber 19 is suitable for microbial growth; the pressure in the cathode chamber 19 and the anode chamber 2 can be adjusted based on the specific reaction conditions.

[0057] In a specific embodiment, the cathode working electrode 12 is carbon felt, the anode counter electrode 10 is a graphite sheet, the reference electrode 13 is Ag / AgCl, the membrane is a proton exchange membrane 21, and the cathode microorganism is Sporomusaovata DSM 2662; CO2 gas is introduced into the cathode chamber 19 to increase the pressure in the reactor to 10 bar, and N2 is introduced into the anode chamber 2 to keep the pressure consistent with that in the cathode chamber 19; under the action of electricity and microorganisms, the CO2 gas is converted into acetic acid at the cathode.

[0058] The reaction in the cathode chamber 19 is mainly H + +2e - →H2 and 4H2+2CO2→CH3COOH+2H2O; the reaction in the anode chamber 2 is mainly 4OH - +4e - →2H2O+O2; the pressure in both cathode chamber 19 and anode chamber 2 is 10 bar, the reaction temperature is 37°C, and the reaction potential is -1.2V. During this process, the CO2 partial pressure in cathode chamber 19 decreases, and hydrogen may be released from cathode chamber 19. Oxygen is released from anode chamber 2. Constant attention should be paid to changes in the internal pressure of cathode chamber 19 and anode chamber 2, as well as changes in cathode pH. The optimal pH is approximately 5-7. This embodiment can directly convert CO2 into organic acids. The produced organic acids can be used as a carbon source in the anaerobic denitrification process in sewage treatment plants or as industrial platform compounds for food additives, bioplastic production, or fuel production.

[0059] In another embodiment, the cathode converts CO2 gas into methane gas, the cathode microorganism is Methanosarcina barkeri DSM 800, and the other conditions are consistent with the above embodiment.

[0060] The reaction in the cathode chamber 19 is mainly H + +2e - →H2 and 4H2+CO2→CH4+2H2O. The reaction in the anode chamber is mainly 4OH - +4e -→2H2O+O2. The pressure in both cathode chamber 19 and anode chamber 2 is 10 bar, the reaction temperature is 37°C, and the reaction potential is -1.2V. During this process, the CO2 partial pressure shows a downward trend, while the CH4 partial pressure shows an upward trend. At the same time, hydrogen may be precipitated in cathode chamber 19; oxygen is precipitated in anode chamber 2. Attention should be paid to changes in the internal pressure of cathode chamber 19 and anode chamber 2, as well as changes in cathode pH. The optimal pH is 6.5-7. If the pH fluctuates, phosphoric acid or NaOH should be promptly added through cathode liquid inlet and outlet 18. This embodiment can convert CO2 into CH4 and can also be used for biogas purification. The high-purity methane gas produced can be directly fed into the natural gas pipeline network and used directly.

[0061] In addition, the present invention can be used in a variety of situations: 1) a proton exchange membrane can be used for microbial electrochemical reactions. The proton exchange membrane can allow the cathode and anode reactions to proceed independently, with only proton exchange between them. This not only prevents the cathode products from being oxidized at the anode, thereby reducing the reaction efficiency, but also prevents the anode from producing oxygen that affects the activity of anaerobic bacteria at the cathode; 2) the electrolytic cell has the same function as an ordinary electrolytic cell without using a proton exchange membrane, but requires controlling the voltage to reduce the influence between the anode and cathode products, thereby reducing the internal resistance of the electrolytic cell and reducing economic costs.

[0062] Although the embodiments disclosed in this application are as described above, the contents described are merely embodiments adopted to facilitate understanding of this application and are not intended to limit this application. Any person skilled in the art to which this application belongs may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this application. However, the scope of patent protection of this application shall still be based on the scope defined by the attached claims.

Claims

1. A CO2 gas high-value conversion device based on micro-high voltage electrochemical technology, characterized by: The device includes a heating device, a sealed housing, a working electrode, a counter electrode, a reference electrode and a stirring device; wherein the heating device is arranged to surround the sealed housing; The sealed housing is provided with a cathode chamber and an anode chamber, wherein the cathode chamber contains homoacetogenic bacteria or methanogenic bacteria, and the homoacetogenic bacteria are selected from Sporomusa Fungus, Clostridium Fungus, Moorella Fungus or Acetobacterium The methanogen is selected from Methanosarcina Fungus or Methanosaeta Bacteria; a clamping plate is provided between the cathode chamber and the anode chamber, the clamping plate being composed of two hollow cylinders placed horizontally and opposite to each other, and matching grooves and protrusions are respectively provided on the contacting portions of the two hollow cylinders, a proton exchange membrane is provided between the two hollow cylinders, and the edges of the proton exchange membrane are clamped by the grooves and the protrusions; The working electrode and the reference electrode extend from the outside of the top cover of the sealed housing into the cathode chamber, the counter electrode extends from the outside of the top cover of the sealed housing into the anode chamber, the working electrode is made of carbon felt or carbon cloth, the counter electrode is made of graphite sheet, and the reference electrode is a silver / silver chloride electrode or a saturated calomel electrode; The stirring device extends from the outside of the top cover of the sealed shell into the cathode chamber and the anode chamber respectively. The top cover of the sealed shell is provided with liquid inlet and outlet ports and air inlet and outlet ports for connecting to the gas pipeline. The liquid inlet and outlet ports and the air inlet and outlet ports are connected to the cathode chamber and the anode chamber respectively. The inlet and outlet valves of the gas pipeline are equipped with pressure gauges to monitor the pressure in the cathode chamber and the anode chamber.

2. The gas high-value conversion device according to claim 1, wherein the homoacetogenic bacteria are selected from Sporomusa ovata 、 Clostridium ljundgahlii 、 Clostridium thermoaceticum 、 Moorella thermoacetica or Acetobacterium woodii .

3. The gas high-value conversion device according to claim 1, wherein the methanogen is selected from Methanosarcina barkeri, Methanosarcina acetivorans or Methanosaeta concilii .

4. The device according to claim 1, wherein the inner diameters of the two hollow cylinders are variable to match the proton exchange membranes of different sizes. The apparatus according to claim 1 , wherein the proton exchange membrane is replaced by a cation exchange membrane or an anion exchange membrane.

6. The device according to any one of claims 1 to 5, wherein the working electrode, the reference electrode and the counter electrode are respectively connected to an external power supply through a conductive metal rod.

7. The device according to claim 6, wherein the conductive metal rod is provided with threads, and the working electrode, the counter electrode, and the reference electrode are connected to the conductive metal rod via the threads.

8. The device according to claim 1 further includes a gas control system, which includes a pressure sensor, a flow rate control device and a safety valve, which are respectively used to adjust and control the gas pressure in the cathode chamber and the anode chamber to ensure the pressure balance in the cathode chamber and the anode chamber.

9. The apparatus according to any one of claims 1 to 5, further comprising a temperature probe extending from above a top cover of the sealed housing into the cathode chamber and the anode chamber.

10. The apparatus of any one of claims 1 to 5, further comprising a controller configured to control the temperature and stirring rate in the cathode chamber and the anode chamber.

11. The apparatus according to claim 1, further comprising a pH detector and a gas composition monitor, the pH detector and the gas composition monitor extending from the outside of the sealed housing into the cathode chamber and the anode chamber, respectively.

12. The device according to any one of claims 1 to 5, wherein a safety valve is further provided on the sealed housing, and the operating pressure range of the safety valve is not greater than 8 MPa.

13. The apparatus according to claim 12, wherein the operating pressure range of the safety valve is not greater than 6 MPa.

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