A highly efficient and stable CO2 reduction flow electrolyzer

Abstract

The application relates to the technical field of electrochemical electrolytic cell devices, and discloses a high-efficiency and stable CO2 reduction flow electrolytic cell which comprises a cathode assembly, an anode assembly and an ion exchange film assembly for separating the two, and the cathode assembly comprises a quartz window sealing cover, a cathode electrolyte flow field plate, a working electrode and a first sealing and insulating layer; the quartz window sealing cover is connected with a CO2 gas inlet hole at one end of a cavity, and a quartz window is arranged in the cavity of the quartz window sealing cover. The high-efficiency and stable CO2 reduction flow electrolytic cell is characterized in that the quartz window sealing cover with the CO2 gas inlet hole is arranged above the working electrode in the cathode assembly of the electrolytic cell; after CO2 enters, the CO2 flows out together with the cathode electrolyte through the working electrode and the cathode electrolyte flow field plate because no gas outlet is arranged, the effective contact between the CO2 and the catalyst is enhanced, the working efficiency and stability of the device can be improved while the production cost is reduced, the device is more suitable for actual application, and the device is suitable for industrial promotion.

Description

Technical Field

[0001] This invention relates to the field of electrochemical electrolysis cell technology, specifically to a highly efficient and stable CO2 reduction flow electrolysis cell. Background Technology

[0002] CO2 is a major greenhouse gas, and excessive CO2 emissions are one of the main causes of global climate change. To mitigate climate change and achieve sustainable development, scientists are searching for effective ways to convert CO2 into useful chemicals and fuels, thus achieving CO2 recycling. In this regard, electrocatalytic CO2 reduction technology has significant potential. By applying current in an electrochemical cell, CO2 can be reduced to other compounds, such as methanol, methane, and ethylene. This method can not only reduce CO2 emissions but also use CO2 as a renewable carbon source, reducing dependence on finite fossil fuels, and has important environmental and energy application value.

[0003] In the field of electrocatalytic CO2 reduction, fluidized electrolyzers are widely used. Fluidized electrolyzers have the advantages of strong controllability and good mass transfer performance. They can provide a stable reaction environment and effectively contact CO2 and catalyst to achieve efficient CO2 conversion.

[0004] However, despite some progress in technologies such as electrocatalytic CO2 reduction and flowing electrolyzers, challenges remain, including low CO2 utilization, poor stability of the reduction process, and the tendency for the working electrode to be flooded and salted out under high current. Solving these problems will lay the foundation for the practical application of electrocatalytic CO2 reduction technology and play an important role in reducing CO2 emissions and achieving sustainable energy. Therefore, research on flowing electrolyzers for electrocatalytic CO2 reduction has significant scientific importance and application prospects. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a highly efficient and stable CO2 reduction flow electrolyzer. In the cathode assembly of the electrolyzer, a quartz window with a CO2 inlet is sealed above the working electrode. After CO2 enters, since there is no gas outlet, the CO2 passes through the working electrode and flows out with the cathode electrolyte, enhancing the effective contact between CO2 and the catalyst. This reduces production costs while improving the device's efficiency and stability, better meeting the requirements of practical applications and suitable for industrial promotion. It solves the problems of low CO2 utilization, poor stability of the reduction process, and the tendency for the working electrode to be flooded and salted out under high current.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a highly efficient and stable CO2 reduction flow electrolyzer, comprising a cathode assembly, an anode assembly, and an ion exchange membrane assembly separating the two. The cathode assembly includes: a quartz window sealing cover, a cathode electrolyte flow field plate, a working electrode, and a first sealing and insulating layer. One end of the cavity of the quartz window sealing cover is connected to a CO2 inlet hole, and a quartz window is disposed inside the cavity of the quartz window sealing cover. The ion exchange membrane assembly includes: an ion exchange membrane and a second sealing and insulating layer. The anode assembly includes: an anode base plate, an anode material, an anode electrolyte flow field plate, and a third sealing and insulating layer. Threaded holes are provided at the same positions at the four corners of the cathode assembly, the anode assembly, and the ion exchange membrane assembly separating the two, and reinforcing bolts are disposed between several sets of threaded holes.

[0009] Preferably, the quartz window sealing cover has a size of 5-10×20-30×1mm, and the inside of the quartz window sealing cover has a cavity with a size of 5-10×20-30×2-5mm. The top of the inner wall of the cavity has a CO2 inlet channel that communicates with the CO2 inlet hole.

[0010] Preferably, the cathode electrolyte flow field plate has a cathode electrolyte flow field plate cavity with a size of 5-10×20-30×2-5 in the middle. The cathode electrolyte flow field plate cavity is filled with electrolyte. The upper and lower ends of the cathode electrolyte flow field plate cavity are respectively connected to the electrolyte inlet and outlet holes. The cathode electrolyte flow field plate includes a cathode chamber fluid inlet, a reference electrode, a cathode chamber fluid outlet, and a cathode chamber reference electrode channel. The cathode chamber reference electrode channel is opened at the top of the left side of the cathode chamber and communicates with the cathode electrolyte flow field plate cavity. The reference electrode is disposed inside the cathode electrolyte flow field plate cavity and is connected to the electrochemical workstation. The cathode electrolyte flow field plate has a cathode electrolyte inlet channel at the bottom of the left side and communicates with the cathode electrolyte flow field plate cavity. The cathode chamber fluid outlet channel is opened at the top of the right side of the cathode chamber and corresponds to the cathode electrolyte inlet channel.

[0011] Preferably, the working electrode is a gas diffusion electrode loaded with a catalyst, with a size of 5-10×25-35×1mm, and one end of the gas diffusion electrode is connected to a first conductive copper foil. The first sealing and insulating layer is a double-layer rubber pad with a 5×20mm square hole in the middle.

[0012] Preferably, the second sealing and insulating layer is a double-layer rubber pad with a square hole of 5-10×20-30mm in the middle.

[0013] Preferably, the anode base plate is a smooth flat plate, the anode material is a piece of 5-10×25-35×1mm foamed nickel, and one end of the anode material is connected to a second conductive copper foil for connection to the cathode of the electrochemical workstation. The anode electrolyte flow field plate has a cavity of 5-10×20-30×2-5mm in the middle, and the upper and lower ends of the cavity are respectively connected to the inlet and outlet holes of the electrolyte. The third sealing insulation layer is a double-layer rubber pad in the shape of a 5-10×20-30mm square hole in the middle.

[0014] Preferably, the cavity of the anolyte flow field plate is filled with electrolyte, the top of the anolyte flow field plate is provided with an anolyte outlet, and the anolyte outlet is connected to the cavity of the anolyte flow field plate through an anolyte outlet channel, and the bottom of the anolyte flow field plate is provided with an anolyte inlet, and the anolyte inlet is connected to the interior of the cavity of the anolyte flow field plate.

[0015] Preferably, the quartz window is made of quartz glass, the first sealing insulation layer, the second sealing insulation layer and the third sealing insulation layer are all made of rubber, the reinforcing bolts are made of stainless steel, and the quartz window sealing cover, the cathode electrolyte flow field plate, the anode electrolyte flow field plate and the anode base plate are all made of polyetheretherketone.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present invention provides a highly efficient and stable CO2 reduction flowing electrolyzer, which has the following beneficial effects:

[0018] 1. In the cathode assembly of the electrolytic cell of the present invention, a quartz window sealing cover with a CO2 inlet is provided above the working electrode. After CO2 enters, since there is no gas outlet, CO2 will pass through the working electrode and enter the cathode electrolyte flow field plate and flow out together with the cathode electrolyte. Compared with the existing flow electrolytic cells, the present invention enhances the effective contact between CO2 and the catalyst.

[0019] 2. In this invention, potassium bicarbonate is the most suitable electrolyte. As CO2 is transported in the flow channel, it can continuously dissolve into the electrolyte until it becomes saturated. When the CO2-saturated potassium bicarbonate electrolyte flows through the working electrode, CO2 can be released and participate in the electrode reaction. In this way, the utilization rate of CO2 can be greatly improved, thereby reducing the production cost of reduction products.

[0020] 3. The present invention uses CO2 to pass through the working electrode to create a pressure difference between the front and back of the working electrode, which can effectively prevent the electrolyte from seeping out on the back of the working electrode, thereby avoiding the flooding and salting out phenomena that are common in current flow electrolysis cells. Attached Figure Description

[0021] Figure 1 This is a breakdown diagram of the CO2 reduction electrolytic cell in this invention;

[0022] Figure 2 This is a schematic diagram of the cathode assembly in this invention;

[0023] Figure 3 This is a schematic diagram of the ion exchange membrane assembly in this invention;

[0024] Figure 4 This is a schematic diagram of the anode assembly in this invention;

[0025] Figure 5 This is a schematic diagram of the structure of the quartz window sealing cover in this invention;

[0026] Figure 6 This is a schematic diagram of the cathode liquid flow field plate in this invention;

[0027] Figure 7 This is a schematic diagram of the anolyte flow field plate in this invention;

[0028] Figure 8 A breakdown diagram of a traditional CO2 reduction electrolyzer;

[0029] Figure 9 This is a schematic diagram of the structure of a traditional CO2 reduction electrolysis cell sealing cover;

[0030] Figure 10 A graph showing the current data for CO2 reduction using the flow electrolyzer of the present invention at -1.0V (relative to the reversible hydrogen electrode);

[0031] Figure 11 This is a graph showing the current data for CO2 reduction using a conventional flow electrolyzer at -1.0V (relative to the reversible hydrogen electrode).

[0032] In the diagram: 1. Quartz window sealing cover; 2. CO2 inlet; 3. First sealing insulation layer; 4. Working electrode; 5. Cathode electrolyte flow field plate; 6. Cathode electrolyte inlet; 7. Cathode chamber fluid outlet; 8. Reference electrode; 9. Ion exchange membrane; 10. Second sealing insulation layer; 11. Anode electrolyte flow field plate; 12. Anode electrolyte inlet; 13. Anode electrolyte outlet; 14. Anode material; 15. Third sealing insulation layer; 16. Anode base plate; 17. Reinforcing bolt; 18. Threaded hole; 19. Quartz window sealing cover cavity; 20. Cathode electrolyte flow field plate cavity; 21. Anode electrolyte flow field plate cavity; 22. CO2 gas outlet; 23. CO2 inlet channel; 24. Quartz window; 25. Cathode electrolyte inlet channel; 26. Anode electrolyte outlet channel. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1:

[0035] See attached document Figure 1-11 A highly efficient and stable CO2 reduction flow electrolyzer includes a cathode assembly, an anode assembly, and an ion exchange membrane assembly separating the two. The cathode assembly includes a quartz window sealing cover 1, a cathode electrolyte flow field plate 5, a working electrode 4, and a first sealing insulation layer 3. One end of the cavity 19 of the quartz window sealing cover is connected to a CO2 inlet 2, and a quartz window 24 is provided inside the cavity 19 of the quartz window sealing cover. The ion exchange membrane assembly includes an ion exchange membrane 9 and a second sealing insulation layer 10. The anode assembly includes an anode base plate 16, an anode material 14, an anode electrolyte flow field plate 11, and a third sealing insulation layer 15. Threaded holes 18 are provided at the same positions at the four corners of the cathode assembly, the anode assembly, and the ion exchange membrane assembly separating the two. Reinforcing bolts 17 are provided between several sets of threaded holes 18.

[0036] By improving the existing flow electrolyzer structure, this invention aims to increase CO2 utilization and solve common problems of water flooding and salting out during the reduction process. Through these improvements, the invention can reduce production costs while improving the operating efficiency and stability of the device, making it more suitable for practical applications and industrial promotion.

[0037] The anode electrolyte flow field plate cavity 21 is located in the middle of the anode electrolyte flow field plate 11. The anode electrolyte flow field plate cavity 21 and the cathode electrolyte flow field plate cavity 20 are separated by an ion exchange membrane assembly, which is filled with electrolyte. The anode electrolyte outlet 13 is located at the top of the anode electrolyte flow field plate 11 and is connected to the anode electrolyte flow field plate cavity 21 through the anode electrolyte outlet channel 26.

[0038] The anolyte inlet 12 is located at the bottom of the anolyte flow field plate 11 and is connected to the cavity 21 of the anolyte flow field plate through the anolyte inlet 12 channel. The anolyte inlet 12 channel corresponds to the outlet channel.

[0039] The quartz window sealing cover 1 has a size of 5~10×20~30×1mm. The interior of the quartz window sealing cover 1 has a quartz window sealing cover cavity 19 with a size of 5~10×20~30×2~5mm. The top of the inner wall of the quartz window sealing cover cavity 19 has a CO2 inlet channel 23 that communicates with the CO2 inlet hole 2.

[0040] A cathode electrolyte flow field plate 5 has a cavity 20 with a size of 5-10×20-30×2-5 mm in the middle. The cavity 20 is filled with electrolyte. The upper and lower ends of the cavity 20 are connected to the electrolyte inlet and outlet holes, respectively. The cathode electrolyte flow field plate 5 includes a cathode chamber fluid inlet 6, a reference electrode 8, a cathode chamber fluid outlet 7, and a cathode chamber reference electrode channel. The cathode chamber reference electrode channel is located at the top left side of the cathode chamber. The cathode electrolyte flow field plate cavity 20 is connected to the cathode electrolyte flow field plate cavity 20. The reference electrode 8 is located inside the cathode electrolyte flow field plate cavity 20 and is connected to the electrochemical workstation. A cathode electrolyte inlet channel 25 is provided at the bottom left side of the cathode electrolyte flow field plate 5 and is connected to the cathode electrolyte flow field plate cavity 20. A cathode chamber fluid outlet channel is provided at the top right side of the cathode chamber and corresponds to the cathode electrolyte inlet channel 25.

[0041] The working electrode 4 is a gas diffusion electrode loaded with a catalyst, with a size of 5-10×25-35×1mm. One end of the gas diffusion electrode is connected to a first conductive copper foil. The first sealing and insulating layer 3 is a double-layer rubber pad with a 5×20mm square hole in the middle.

[0042] The first sealing and insulating layer 3 is used to clamp the working electrode 4 in the middle of the first sealing and insulating layer 3, and then place it in the quartz window sealing cover 1 and the cathode electrolyte flow field plate 5 to form a cathode assembly.

[0043] The second sealing and insulating layer 10 is a double-layer rubber pad with a square hole of 5-10×20-30mm in the middle in a square shape;

[0044] The second sealing and insulating layer 10 is provided to place the ion exchange membrane 9 in the center of the second sealing and insulating layer 10 to form an ion exchange membrane assembly.

[0045] The anode base plate 16 is a smooth flat plate, the anode material 14 is a piece of foamed nickel of 5-10×25-35×1mm, and one end of the anode material 14 is connected to a second conductive copper foil for connection with the cathode of the electrochemical workstation. The anode electrolyte flow field plate 11 has a cavity 21 of 5-10×20-30×2-5mm in the middle, and the upper and lower ends of the cavity 21 are connected to the inlet and outlet holes of the electrolyte respectively. The third sealing insulation layer 15 is a double-layer rubber pad with a square hole of 5-10×20-30mm in the middle.

[0046] The anode material 14 is sandwiched in the middle of the third sealing insulation layer 15 and then placed between the anode base plate 16 and the anode electrolyte flow field plate 11 to form an anode assembly.

[0047] The cavity 21 of the anode electrolyte flow field plate is filled with electrolyte. The top of the anode electrolyte flow field plate 11 is provided with an anode electrolyte outlet 13, which is connected to the cavity 21 of the anode electrolyte flow field plate through an anode electrolyte outlet channel 26. The bottom of the anode electrolyte flow field plate 11 is provided with an anode electrolyte inlet 12, which is connected to the interior of the cavity 21 of the anode electrolyte flow field plate.

[0048] The quartz window 24 is made of quartz glass. The first sealing insulation layer 3, the second sealing insulation layer 10 and the third sealing insulation layer 15 are all made of rubber. The reinforcing bolt 17 is made of stainless steel. The quartz window sealing cover 1, the cathode electrolyte flow field plate 5, the anode electrolyte flow field plate 11 and the anode base plate 16 are all made of polyetheretherketone.

[0049] In this example, a highly efficient and stable CO2 reduction flow electrolyzer is used, such as... Figure 1 As shown, its main material is corrosion-resistant and high-temperature resistant polyetheretherketone. The quartz window sealing cover 1 is a block with a length of 60mm, a width of 60mm, and a thickness of 6mm. The center is a quartz window sealing cover cavity 19 with a length of 20mm, a width of 5mm, and a thickness of 5mm. The gas inlet is directly connected to the quartz window sealing cover cavity 19 from the middle of one edge. The channel is a CO2 inlet channel 23 with a diameter of 0.5mm. The quartz window 24 is quartz glass with a length of 20mm, a width of 5mm, and a thickness of 1mm.

[0050] The cathode electrolyte flow field plate 5 is a cube 60mm long, 60mm wide, and 5mm thick. At its center is a cathode electrolyte flow field plate cavity 20, 20mm long, 5mm wide, and 5mm thick. Electrolyte inlet and outlet channels are respectively opened on the lower left and upper right sides of the cathode electrolyte flow field plate cavity 20, extending to the outer edge of the cathode electrolyte flow field plate 5. These channels are cathode electrolyte inlet channels 25 with a diameter of 0.5mm. A reference electrode channel, a circular channel with a diameter of 4mm, is opened above the electrolyte channel on the lower left side. The anode electrolyte flow field plate is 60mm long, 60mm wide, and 5mm thick. The anode electrolyte flow field plate 11 has a 5mm block size, with a 20mm long, 5mm wide, and 5mm thick cavity 21 in the center. Electrolyte inlet and outlet channels are respectively opened below and above the cavity 21 to the outer edge of the anode electrolyte flow field plate 11. The channels are anode electrolyte outlet channels 26 with a diameter of 0.5mm. The anode base plate 16 is a block size with a length of 60mm, a width of 60mm, and a thickness of 5mm. The sealing and insulating layer is a rubber gasket that matches the above components.

[0051] The aforementioned quartz window sealing cover 1, cathode electrolyte flow field plate 5, anode electrolyte flow field plate 11, and anode base plate 16 all have threaded holes 18 at the same positions at the four corners, facilitating secure sealing with reinforcing bolts 17 after assembly. The aforementioned gas inlet, electrolyte inlet / outlet, and reference electrode insertion port are all threaded. In practical implementation, the actual volume of the entire electrolytic cell and the internal chamber volume can be scaled down according to specific test conditions.

[0052] In this example, Bi2O2CO3 was used as the catalyst, and the reaction was tested using an electrolytic cell. The electrolyte was 0.5M KHCO3 solution, the gas diffusion electrode was Toray carbon paper (YLS-30T GDL) from Japan, the ion exchange membrane 9 was Nafion 117, the reference electrode 8 was a silver / silver chloride electrode, and the anode material 14 was a nickel foam electrode.

[0053] Before formal testing, the catalyst was loaded onto the gas diffusion electrode and the electrolytic cell was assembled. 50 ml of 0.5 M KHCO3 solution was added to the cathode electrolyte tank and the anode electrolyte tank respectively as electrolyte. The electrolyte was pumped into the cathode and anode components at flow rates of 10 mL / min and 30 mL / min respectively by a peristaltic pump. Pure CO2 with a flow rate of 30 ml / min was introduced at the CO2 inlet. The CO2 passed through the working electrode 4 through the quartz window sealing cover cavity 19 and flowed out from the outlet together with the cathode electrolyte. Gas-liquid separation was completed in the cathode electrolyte tank. The CO2 participating in the reaction came from the CO2 passing through the working electrode 4 and the CO2 dissolved in the electrolyte.

[0054] After 10 minutes of aeration, the corresponding electrodes were connected to an electrochemical workstation for 1 hour of constant potential electrolysis. The test conditions were -1.0V (relative to the reversible hydrogen electrode). The current stability of the catalyst was as follows: Figure 10 As shown.

[0055] Example 2: The difference from Example 1 is that;

[0056] See attached document Figure 9 and Figure 11 In this embodiment, the quartz window sealing cover 1 in the cathode assembly is also provided with a CO2 gas outlet 22, which is located on the other side of the CO2 gas inlet.

[0057] In this embodiment, during operation, CO2 gas enters from the top vent of the quartz window sealing cover and flows out from the bottom CO2 gas outlet 22, without directly entering the electrolyte system. The CO2 participating in the reaction mainly originates from the CO2 diffused onto the surface of the working electrode 4.

[0058] After 10 minutes of aeration, the corresponding electrodes were connected to an electrochemical workstation for 1 hour of constant potential electrolysis. The test conditions were -1.0V. The current stability of the catalyst relative to the reversible hydrogen electrode was as follows: Figure 11 As shown.

[0059] Compared to Example 1, it can be observed that under these test conditions, the electrolytic cell designed using this invention exhibits a higher operating current and excellent stability. This demonstrates the three major advantages of this invention:

[0060] 1. CO2 can directly pass through the working electrode 4 and enter the system, which effectively increases the effective contact between CO2 and the working electrode 4, thereby promoting the reaction efficiency;

[0061] 2. CO2 continuously dissolves in the KHCO3 solution within the flow channel, significantly improving CO2 utilization. This method reduces the production cost of reduction products, making the electrolysis process more economical and efficient.

[0062] 3. Traditional flow cell systems are prone to leakage under high operating currents, leading to flooding and salt precipitation. However, the ingenious air intake method of this invention creates a pressure difference between the front and back of the working electrode 4, preventing electrolyte leakage and avoiding flooding and salt precipitation, thereby greatly improving the operational stability of the device.

[0063] It should be noted that the term "comprising," or any other variation thereof, is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A highly efficient and stable CO2 reduction flowing electrolytic cell, characterized in that, The assembly includes a cathode assembly, an anode assembly, and an ion exchange membrane assembly that separates the two. The cathode assembly includes a quartz window sealing cover (1), a cathode electrolyte flow field plate (5), a working electrode (4), and a first sealing insulation layer (3). One end of the cavity (19) of the quartz window sealing cover is connected to a CO2 inlet hole (2). A quartz window (24) is provided inside the cavity (19). The ion exchange membrane assembly includes an ion exchange membrane (9) and a second sealing insulation layer (10). The anode assembly includes an anode base plate (16), an anode material (14), an anode electrolyte flow field plate (11), and a third sealing insulation layer (15). Threaded holes (18) are provided at the same positions at the four corners of the cathode assembly, the anode assembly, and the ion exchange membrane assembly that separates the two. Reinforcing bolts (17) are provided between several sets of threaded holes (18). The anode base plate (16) is a smooth flat plate, the anode material (14) is a piece of 5~10×25~35×1 mm foamed nickel, and one end of the anode material (14) is connected to a second conductive copper foil for connection with the cathode of the electrochemical workstation. The anode electrolyte flow field plate (11) has a cavity (21) of 5~10×20~30×2~5 mm in the middle, and the upper and lower ends of the cavity (21) are connected to the inlet and outlet holes of the electrolyte respectively. The third sealing insulation layer (15) is a double-layer rubber pad with a square hole of 5~10×20~30 mm in the middle. The cavity (21) of the anode electrolyte flow field plate is filled with electrolyte. The top of the anode electrolyte flow field plate (11) is provided with an anode electrolyte outlet (13), and the anode electrolyte outlet (13) is connected to the cavity (21) of the anode electrolyte flow field plate through the anode electrolyte outlet channel (26). The bottom of the anode electrolyte flow field plate (11) is provided with an anode electrolyte inlet (12), and the anode electrolyte inlet (12) is connected to the interior of the cavity (21) of the anode electrolyte flow field plate.

2. The efficient and stable CO2 reduction flowing electrolyzer according to claim 1, characterized in that: The quartz window sealing cover (1) is 5~10×20~30×1 mm in size. The interior of the quartz window sealing cover (1) is provided with a quartz window sealing cover cavity (19) with a size of 5~10×20~30×2~5 mm. The top of the inner wall of the quartz window sealing cover cavity (19) is provided with a CO2 inlet channel (23) that communicates with the CO2 inlet hole (2).

3. The efficient and stable CO2 reduction flowing electrolyzer according to claim 2, characterized in that: The cathode electrolyte flow field plate (5) has a cathode electrolyte flow field plate cavity (20) with a size of 5~10×20~30×2~5mm in the middle. The cathode electrolyte flow field plate cavity (20) is filled with electrolyte. The upper and lower ends of the cathode electrolyte flow field plate cavity (20) are respectively connected to the electrolyte inlet and outlet holes. The cathode electrolyte flow field plate (5) includes a cathode chamber fluid inlet (6), a reference electrode (8), a cathode chamber fluid outlet (7), and a cathode chamber reference electrode channel. The cathode chamber reference electrode channel is located on the left side of the cathode chamber. The reference electrode (8) is located inside the cathode electrolyte flow field plate cavity (20) and is connected to the electrochemical workstation. A cathode electrolyte inlet channel (25) is opened at the bottom left side of the cathode electrolyte flow field plate (5), and the cathode electrolyte inlet channel (25) is connected to the cathode electrolyte flow field plate cavity (20). A cathode chamber fluid outlet channel is opened at the top right side of the cathode chamber, and the cathode chamber fluid outlet channel corresponds to the cathode electrolyte inlet channel (25).

4. The efficient and stable CO2 reduction flowing electrolyzer according to claim 3, characterized in that: The working electrode (4) is a gas diffusion electrode loaded with a catalyst, with a size of 5~10×25~35×1 mm. One end of the gas diffusion electrode is connected to a first conductive copper foil, and the first sealing insulation layer (3) is a double-layer rubber pad with a 5×20 mm square hole in the middle.

5. The efficient and stable CO2 reduction flowing electrolyzer according to claim 1, characterized in that: The second sealing and insulating layer (10) is a double-layer rubber pad with a square hole of 5~10×20~30 mm in the middle.

6. The efficient and stable CO2 reduction flowing electrolyzer according to claim 1, characterized in that: The quartz window (24) is made of quartz glass, the first sealing insulation layer (3), the second sealing insulation layer (10) and the third sealing insulation layer (15) are all made of rubber, and the reinforcing bolt (17) is made of stainless steel. The quartz window sealing cover (1), the cathode electrolyte flow field plate (5), the anode electrolyte flow field plate (11) and the anode base plate (16) are all made of polyetheretherketone.

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