Flow electrolysis unit for enhanced carbon dioxide mass transfer and its application

Abstract

This invention relates to a flow-type electrolysis device for enhancing carbon dioxide mass transfer and its application, comprising: a clamping assembly including a first clamping plate and a second clamping plate; at least one set of electrode assemblies, each including a cathode plate and an anode plate, the cathode plate being connected to the first clamping plate and the anode plate being connected to the second clamping plate, the cathode plate having a cathode medium outlet and a cathode medium inlet, and the anode plate having an anode medium outlet and an anode medium inlet; and a bipolar plate located between the cathode plate and the anode plate; wherein the diameter of the bipolar plate outlet is smaller than the diameter of the bipolar plate inlet. This invention utilizes the electrolyte flow characteristics to solve the problems of difficult water management and poor stability caused by salt deposition in traditional membrane reactors, ultimately achieving both high current density and stability in the electrocatalytic reduction of carbon dioxide. This enhances the carbon dioxide mass transfer process.

Description

Technical Field

[0001] This invention relates to the field of chemical reaction apparatus technology, and in particular to a flow electrolysis apparatus for enhancing carbon dioxide mass transfer and its application. Background Technology

[0002] Converting carbon dioxide into high-value-added products using renewable electricity is an effective means to achieve the strategic goals of "carbon peaking and carbon neutrality." The industrial application of electrocatalytic carbon dioxide reduction is the future development trend in this field. Highly efficient reaction devices are key to promoting the industrial application of electrocatalytic carbon dioxide reduction. However, current carbon dioxide reduction reaction devices still need to overcome problems such as low current density and poor stability.

[0003] Performance can be improved by optimizing the reactor structure: Patent application CN217298035U proposes an H-type electrolysis device for electrocatalytic carbon dioxide reduction, which is limited by the low solubility of carbon dioxide in the electrolyte, and the current density is typically below 50 mA cm⁻². Patent application CN112522732A proposes a flow channel membrane reactor that converts the material into moist carbon dioxide gas to solve the problem of poor carbon dioxide mass transfer.

[0004] However, the above methods are difficult to manage water and are prone to salt deposition on the electrode surface, resulting in poor stability of the reaction device and failing to meet the requirements of industrial applications. Summary of the Invention

[0005] The main objective of this invention is to overcome the shortcomings of existing flow electrolysis devices for enhancing carbon dioxide mass transfer, and to provide a new flow electrolysis device for enhancing carbon dioxide mass transfer. The technical problem to be solved is that it can at least solve the technical problems of water management difficulties and salt deposition on the electrode surface, which leads to poor stability of the reaction device and failure to meet the requirements of industrial applications. Therefore, it is more suitable for practical use and has industrial utilization value.

[0006] The objective of this invention and the technical problem it solves are achieved by the following technical solution. This invention is based on...

[0007] Compared with the prior art, the present invention has significant advantages and beneficial effects. As can be seen from the above technical solution, in order to achieve the aforementioned objectives, the main technical contents of the present invention are as follows:

[0008] This invention proposes a flow-type electrolysis device for enhancing carbon dioxide mass transfer, comprising:

[0009] The clamping assembly includes a first clamping plate and a second clamping plate, which are disposed opposite to each other.

[0010] At least one set of electrode assembly, the electrode assembly including a cathode plate and an anode plate, the cathode plate being connected to a first clamping plate, the anode plate being connected to a second clamping plate, the cathode plate having a cathode medium outlet and a cathode medium inlet, the anode plate having an anode medium outlet and an anode medium inlet; a bipolar plate located between the cathode plate and the anode plate; wherein the diameter of the outlet of the bipolar plate is smaller than the diameter of the inlet of the bipolar plate.

[0011] In one alternative embodiment, the ratio of the outlet diameter to the inlet diameter of the bipolar plate is 0.2-5.

[0012] In one optional embodiment, the inner walls of the first clamping plate and the second clamping plate are provided with grooves, the cathode plate is located in the groove of the first clamping plate, and the anode plate is located in the groove of the second clamping plate.

[0013] In one optional embodiment, the side of the bipolar plate opposite to the cathode plate and the side of the bipolar plate opposite to the anode plate both have a serpentine flow field;

[0014] The serpentine flow field is connected to the inlet and outlet of the bipolar plate.

[0015] In an optional embodiment, a gasket is further included; the first clamping plate and the second clamping plate are provided with water-stop grooves, and the gasket is located within the water-stop grooves of the first clamping plate and the second clamping plate.

[0016] In one optional embodiment, the diameter of the water-stop groove is 0.5mm-5mm.

[0017] In one optional embodiment, the gasket material is one of silicone, fluoropolymer, or polytetrafluoroethylene.

[0018] In an optional embodiment, the clamping assembly further includes connecting bolts; bolt holes are provided on the outer edges of the first clamping plate and the second clamping plate, and the first clamping plate and the second clamping plate clamp the electrode assembly and the bipolar plate in the middle by the connecting bolts.

[0019] In one optional embodiment, the mixed-phase solution introduced into the flow electrolysis device includes an electrolyte containing dissolved carbon dioxide gas, wherein the electrolyte is one or more of potassium carbonate, potassium sulfate, and potassium chloride.

[0020] In one optional embodiment, the bipolar plate material includes one of 304 stainless steel, 316 stainless steel, titanium plate, and iron plate.

[0021] On the other hand, an application of a flow-type electrolysis device for enhancing carbon dioxide mass transfer is also provided, the application including applying any of the flow-type electrolysis devices for enhancing carbon dioxide mass transfer described in the above embodiments to electrocatalytic carbon dioxide reduction and gas-liquid flow electrochemical conversion.

[0022] By employing the above technical solution, the flow electrolysis device for enhancing carbon dioxide mass transfer of the present invention has at least the following advantages:

[0023] The electrolysis device provided in this invention uses an electrolyte containing a mixture of carbon dioxide gas as the reactant. This device achieves pressurized dissolution and depressurized precipitation of carbon dioxide within the electrolysis unit. Simultaneously, the collision of the electrolyte in the flow field shears the carbon dioxide bubbles, overcoming the mass transfer limitation problem and increasing the current density. The electrolyte flow characteristics address the difficulties in water management and the poor stability caused by salt deposition in traditional membrane reactors, ultimately achieving both high current density and stability in the electrocatalytic reduction of carbon dioxide. In this invention, the mixed phase of electrolyte and carbon dioxide enters the electrolysis device through a bipolar plate inlet for reaction and flows out from the bipolar plate outlet. Due to the size difference between the inlet and outlet of the bipolar plate, the carbon dioxide pressure is higher at the inlet, increasing its solubility. After entering the reactor, because the outlet diameter is smaller than the inlet, the gas pressure decreases, causing carbon dioxide bubbles to precipitate, thus enhancing the carbon dioxide mass transfer process.

[0024] In summary, the novel flow electrolysis device for enhancing carbon dioxide mass transfer of this invention solves the technical problems of difficult water management and easy salt deposition on the electrode surface, resulting in poor stability of the reaction device and inability to meet industrial applications. It has many advantages and practical value, and no similar design has been publicly disclosed or used in similar flow electrolysis devices for enhancing carbon dioxide mass transfer, thus it is truly innovative. It has made significant improvements in both the enhanced carbon dioxide mass transfer flow electrolysis device and its functions, representing a major technological advancement and producing a user-friendly and practical effect. Compared with existing flow electrolysis devices for enhancing carbon dioxide mass transfer, it has multiple enhanced functions, making it more suitable for practical use and possessing broad industrial application value. It is truly a novel, progressive, and practical new design.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] The specific flow electrolysis apparatus for enhancing carbon dioxide mass transfer according to the present invention is given in detail in the following embodiments and accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a flow electrolysis device for enhancing carbon dioxide mass transfer, provided in an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the clamping plate (first clamping plate, second clamping plate) provided in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the cathode plate and anode plate structure provided in an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of a bipolar plate provided in an embodiment of the present invention.

[0031] Figure label:

[0032] 1-First clamping plate, 2-Second clamping plate, 3-Anode plate, 4-Cathode plate, 5-Bipolar plate, 6-Water-stop groove, 7-Terminal, 8-Serpentine flow field. Detailed Implementation

[0033] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation of the flow electrolysis device for enhancing carbon dioxide mass transfer according to the present invention is provided in conjunction with the accompanying drawings and preferred embodiments.

[0034] Please see Figure 1 As shown, the preferred embodiment of the flow-type electrolysis device for enhancing carbon dioxide mass transfer of the present invention includes: a clamping assembly, at least one set of electrode assemblies, and a bipolar plate 5. The clamping assembly includes a first clamping plate 1 and a second clamping plate 2, which are disposed opposite to each other. The electrode assembly includes a cathode plate 4 and an anode plate 3, with the cathode plate 4 connected to the first clamping plate 1 and the anode plate 3 connected to the second clamping plate 2. The cathode plate 4 has a cathode medium outlet and a cathode medium inlet, and the anode plate 3 has an anode medium outlet and an anode medium inlet. The bipolar plate 5 is located between the cathode plate 4 and the anode plate 3. The diameter of the outlet of the bipolar plate 5 is smaller than the diameter of the inlet of the bipolar plate 5.

[0035] The electrolysis apparatus provided in this embodiment of the invention has at least the following beneficial effects:

[0036] The electrolysis device provided in this invention uses an electrolyte containing a mixture of carbon dioxide gas as the reactant. This device achieves pressurized dissolution and depressurized precipitation of carbon dioxide within the electrolysis unit. Simultaneously, the collision of the electrolyte in the flow field shears the carbon dioxide bubbles, overcoming the mass transfer limitation problem and increasing the current density. The electrolyte flow characteristics address the difficulties in water management and the poor stability caused by salt deposition in traditional membrane reactors, ultimately achieving both high current density and stability in the electrocatalytic reduction of carbon dioxide. The mixed phase of electrolyte and carbon dioxide enters the electrolysis device through the inlet of bipolar plate 5 for reaction and flows out from the outlet of bipolar plate 5. Due to the size difference between the inlet and outlet of bipolar plate 5, the carbon dioxide pressure is higher at the inlet, increasing its solubility. After entering the reactor, because the outlet diameter is smaller than the inlet, the gas pressure decreases, causing carbon dioxide bubbles to precipitate, thus enhancing the carbon dioxide mass transfer process.

[0037] The following will further explain and describe the enhanced carbon dioxide mass transfer flow electrolysis apparatus provided by the embodiments of the present invention through optional examples.

[0038] It should be noted that the electrode assembly and bipolar plate 5 provided by the present invention form a reaction unit. The reaction unit provided in the embodiments of the present invention is at least one, that is, multiple reaction units can be set according to actual needs. The number of reaction units in the embodiments of the present invention is not limited to this.

[0039] The anode plate 3 of this invention is provided with an inlet and an outlet, and the inlet and outlet on the anode plate 3 correspond to the inlet and outlet on the bipolar plate 5. Furthermore, the inlet and outlet on the anode plate 3 are not identical; more specifically, the diameter of the inlet on the anode plate 3 is larger than the diameter of the outlet. The anode plate 3 is provided with terminals 7 for connecting the cathode power supply and the anode power supply, which can meet the current range of <2000 A. Positioning brackets are provided around the anode plate 3 to facilitate the positioning of the electrodes, diaphragm, and sealing gasket. The anode plate 3 is provided with a water-stop groove 6, the diameter of which is 0.5-5 mm, preferably 1 mm. The anode plate 3 is made of metal, including one of 304 stainless steel, 316 stainless steel, titanium plate, and iron plate. One side of the anode plate 3 has a serpentine flow field 8, which communicates with the inlet and outlet of the anode plate 3.

[0040] The cathode plate 4 of this invention is provided with an inlet and an outlet, and the inlet and outlet on the cathode plate 4 correspond to the inlet and outlet on the bipolar plate 5. Furthermore, the inlet and outlet on the cathode plate 4 are not identical; more specifically, the diameter of the inlet on the cathode plate 4 is larger than the diameter of the outlet. The cathode plate 4 is provided with terminals 7 for connecting cathode and anode power supplies, which can meet the current carrying range of <2000 A. Positioning brackets are provided around the cathode plate 4 to facilitate the positioning of the electrodes, diaphragm, and sealing gasket. The cathode plate 4 is provided with a water-stop groove 6, the diameter of which is 0.5-5 mm, preferably 1 mm. The cathode plate 4 is made of a metal material, including one of 304 stainless steel, 316 stainless steel, titanium plate, and iron plate.

[0041] In one optional embodiment, the side of the bipolar plate 5 opposite to the cathode plate 4 has a serpentine flow field 8, and the side of the bipolar plate 5 opposite to the anode plate 3 also has a serpentine flow field 8; the serpentine flow field 8 and the serpentine flow field 8 are connected at the inlet and outlet of the bipolar plate 5. Furthermore, in this embodiment of the invention, one side of the cathode plate 4 is also provided with a serpentine flow field 8, which is connected to the inlet and outlet of the anode plate 3.

[0042] The bipolar plate 5 of this invention has a serpentine flow field 8 on both sides (one side opposite the anode plate 3, and the other side opposite the cathode plate 4) and inlets and outlets of inconsistent sizes; wherein the ratio of the outlet diameter to the inlet diameter of the anode plate 3 is between 0.2 and 5; exemplaryly, the ratio of the outlet diameter to the inlet diameter of the anode plate 3 can be 0.2, 0.3, 0.5, 0.6, 0.7, or 0.9. The bipolar plate 5 is made of metal, and the material of the bipolar plate 5 can include one of 304 stainless steel, 316 stainless steel, titanium plate, and iron plate, preferably high-purity titanium.

[0043] In one optional embodiment, the present invention uses gaskets and sealing rings to seal the clamping assembly, the electrode assembly, and the bipolar plate 5. The gaskets and sealing rings are made of silicone, fluororubber, or PTFE, preferably fluororubber.

[0044] In this embodiment of the invention, the cathode plate, anode plate, and bipolar plate 5 comprise a minimum reaction unit consisting of a cathode electrode, an anode electrode, and a diaphragm. In other words, the minimum reaction unit of the present invention includes a cathode electrode, an anode electrode, and a diaphragm. The cathode electrode is one or more of the following: carbon felt, carbon cloth, carbon paper, stainless steel mesh, silver mesh (foam), and copper mesh (foam) coated with a carbon dioxide reduction catalyst. The anode electrode is one or more of the following: a solid solution of two-phase or multi-phase oxides of Ir, Ru, Co, Ni, Ti, Ta, Mn, and Fe coated or grown. The diaphragm is selected from one of the following: a cation exchange membrane, an anion exchange membrane, an alkaline PPS membrane, asbestos mesh, and bipolar membrane, preferably a cation exchange membrane.

[0045] The smallest reaction unit is one or more combinations of the aforementioned cathode electrode, anode electrode, and diaphragm; these are stacked and connected in series according to production needs; the introduced reaction medium is an electrolyte containing carbon dioxide gas, and the electrolyte composition is one or more of potassium bicarbonate, potassium chloride, potassium bromide, potassium iodide, potassium carbonate, sodium bicarbonate, and potassium bicarbonate, with an electrolyte concentration of 0.1 M-3 M; for example, it can be 0.1 M, 0.3 M, 0.4 M, 0.7 M, 0.9 M, 2 M, 2.1 M, 2.4 M, 2.6 M, 2.8 M, 3 M, etc. The reaction medium is introduced into the electrolysis device in three forms: gas-liquid two-phase, gas phase, and liquid phase.

[0046] In one optional embodiment, the inner walls of the first clamping plate 1 and the second clamping plate 2 are provided with grooves, the cathode plate 4 is located in the groove of the first clamping plate 1, and the anode plate 3 is located in the groove of the second clamping plate 2. In another optional embodiment, a gasket is further included; the first clamping plate 1 and the second clamping plate 2 are provided with water-stop grooves 6, and the gasket is located within the water-stop grooves 6 of the first clamping plate 1 and the second clamping plate 2. In another optional embodiment, the diameter of the water-stop groove is 0.5mm-5mm. In another optional embodiment, the gasket is made of one of silicone, fluoropolymer, or polytetrafluoroethylene.

[0047] In one optional embodiment, the clamping assembly further includes connecting bolts; bolt holes are provided on the outer edges of the first clamping plate 1 and the second clamping plate 2, and the first clamping plate 1 and the second clamping plate 2 clamp the electrode assembly and the bipolar plate 5 in the middle by connecting bolts.

[0048] The electrolysis apparatus provided by the present invention will be further explained and described below through optional embodiments. Embodiment 1

[0049] Please refer to Figure 1 As shown, this embodiment provides a flow electrolysis device that enhances carbon dioxide mass transfer. It can be assembled in multiple layers according to the smallest reaction unit and used in series, depending on the usage requirements.

[0050] like Figure 1 As shown, the clamping plates at both ends (first clamping plate 1 and second clamping plate 2) are tightened with bolts. The pressure at both ends ensures sufficient pressure and sealing between the cathode plate 4, anode plate 3, and bipolar plate 5 in the middle. Figure 2As shown, the grooves in the clamping plates are used to fix the cathode and anode plates 3. The positioning brackets in the clamping plates (first clamping plate 1 and second clamping plate 2) are used to facilitate multi-layer assembly. The electrolyte inlet and product outlet in the clamping plates (first clamping plate 1 and second clamping plate 2) correspond to the inlets and outlets in the cathode plate 4, anode plate 3, and bipolar plate 5, ensuring that the reaction medium (electrolyte and gas) is evenly distributed among the various plates (cathode plate 4, anode plate 3, and bipolar plate 5). The mixed phase of electrolyte and carbon dioxide (reaction medium) is introduced into the electrolysis device through the inlet on the bipolar plate 5, reacts through the smallest reaction unit, and flows out through the outlet on the bipolar plate 5. The diameter of the outlet on the bipolar plate 5 is 8 mm, and the diameter of the inlet on the bipolar plate 5 is 16 mm. The difference in inlet and outlet dimensions allows the carbon dioxide to have a higher pressure at the inlet, increasing its solubility. After entering the electrolysis device, because the outlet diameter is smaller than the inlet, the gas pressure decreases, and carbon dioxide bubbles are released, thus enhancing the mass transfer process of carbon dioxide.

[0051] Those skilled in the art can Figure 2 , Figure 3 and Figure 4 The structural units can be combined in various ways to form an electric stack containing any number of single-cell reactors.

[0052] A 0.5 mol / L potassium bicarbonate solution and a 0.5 L / min carbon dioxide gas were introduced into the cathode and anode inlets. A DC power supply was connected to terminal 7 to apply voltage for the reaction. The cathode electrode was a 100-mesh silver mesh, and the anode electrode was an Ir-plated titanium mesh. An alkaline PPS membrane was used as the diaphragm. Table 1 shows the data for optimizing current efficiency by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0053] Table 1 shows the optimized current efficiency achieved by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0054] Total voltage V <![CDATA[Current density mA cm -2 > Carbon monoxide selectivity % Carbon dioxide conversion rate % 3.7 50 90 30 3.9 75 82 46 4.5 120 63 69

[0055] When the applied potential is 3.7 V, the selectivity for carbon monoxide is as high as 90%, and the conversion rate of carbon dioxide is 30%.

[0056] Example 2

[0057] Example 2 uses the same structure and catalyst as Example 1, except that the inlet and outlet of the bipolar plate 5 in the electrolysis unit have the same size of 16 mm. Table 2 shows the data for optimizing current efficiency by adjusting the total voltage of the electrolysis cell and the partial potential of each electrode.

[0058] Table 2 shows the optimized current efficiency achieved by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0059] Total voltage V <![CDATA[Current density mA cm -2 > Carbon monoxide selectivity % Carbon dioxide conversion rate % 3.9 45 77 26 4.1 62 69 41 4.6 110 36 49

[0060] The data in Table 2 shows that when the inlet and outlet dimensions of the bipolar plate 5 in the electrolysis unit are consistent, the current density at 4.6V is 110 mA cm⁻¹. -2 The carbon monoxide selectivity was 36%, which is significantly lower than the 90% selectivity in Example 1.

[0061] Example 3

[0062] Example 3 uses the same structure and catalyst as Example 1, except that 1M potassium sulfate is used. Table 3 shows the data for optimizing current efficiency by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0063] Table 3 shows the optimized current efficiency achieved by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0064] Total voltage V <![CDATA[Current density mA cm -2 > Carbon monoxide selectivity % Carbon dioxide conversion rate % 3.9 40 60 20 4.1 58 49 32 4.5 99 22 41

[0065] The data in Table 3 show that when using 1M potassium sulfate, the current density at 4.5V is 99 mA cm⁻¹. -2 The carbon monoxide selectivity was 22%, which is significantly lower than the 90% selectivity in Example 1.

[0066] Example 4

[0067] Example 4 has the same structure and electrolyte as Example 1, except that the cathode electrode uses a carbon felt coated with silver particles.

[0068] Table 4 shows the optimized current efficiency achieved by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0069] Total voltage V <![CDATA[Current density mA cm -2 > Carbon monoxide selectivity % Carbon dioxide conversion rate % 4.0 43 70 30 4.3 60 59 45 4.8 102 46 56

[0070] The data in Table 4 show that when the reactor inlet and outlet dimensions are consistent, the current density at 4.6V is 102 mA cm⁻¹. -2 The carbon monoxide selectivity was 46%, which is significantly lower than the 90% selectivity in Example 1.

[0071] Example 5

[0072] The electrodes and electrolytes described in Example 5 are the same as those in Example 1, except that the ratio of the inlet diameter to the outlet diameter of the electrolytic cell is changed from 1:2 to 1:3.

[0073] Table 5 shows the optimized current efficiency achieved by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0074] Total voltage V <![CDATA[Current density mA cm -2 > Carbon monoxide selectivity % Carbon dioxide conversion rate % 4.2 37 77 24 4.5 53 66 27 4.8 89 61 31

[0075] The data shown in Table 5 indicate that when the reactor inlet to outlet size ratio is 1:3, the current density at 4.8V is 89 mA / cm². -2 The carbon monoxide selectivity was 61%, which is significantly lower than the 90% selectivity in Example 1.

[0076] Example 6

[0077] The electrolyte inlet and outlet dimensions, electrodes, and electrolyte in Example 6 are the same as in Example 1, except that they are made of 316 stainless steel.

[0078] Table 6 shows the data on how current efficiency can be optimized by adjusting the total voltage of the electrolytic cell and the partial potential of each electrode.

[0079] Total voltage V <![CDATA[Current density mA cm -2 > Carbon monoxide selectivity % Carbon dioxide conversion rate % 3.7 55 92 31 3.9 79 81 46 4.5 127 62 66

[0080] The data shown in Table 6 indicates that when the bipolar plate 5 is made of 316 stainless steel, the current density at 4.5V is 127 mA cm⁻¹. -2 The carbon monoxide selectivity was 62%, which is significantly lower than the 90% selectivity in Example 1.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the methods and techniques disclosed above without departing from the scope of the present invention to create equivalent embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A flow-type electrolysis device for enhancing carbon dioxide mass transfer, characterized in that, include: The clamping assembly includes a first clamping plate and a second clamping plate, which are disposed opposite to each other. At least one set of electrode plate assemblies, the electrode plate assembly including a cathode plate and an anode plate, the cathode plate being connected to a first clamping plate, the anode plate being connected to a second clamping plate, the cathode plate having a cathode medium outlet and a cathode medium inlet, and the anode plate having an anode medium outlet and an anode medium inlet; A bipolar plate is located between the cathode plate and the anode plate; Wherein, the diameter of the outlet of the bipolar plate is smaller than the diameter of the inlet of the bipolar plate; The side of the bipolar plate opposite to the cathode plate and the side of the bipolar plate opposite to the anode plate both have a serpentine flow field; The serpentine flow field is connected to the inlet and outlet of the bipolar plate.

2. The flow-type electrolysis device for enhancing carbon dioxide mass transfer according to claim 1, characterized in that, The ratio of the outlet diameter to the inlet diameter of the bipolar plate is 0.2-0.

9.

3. The flow electrolysis device for enhancing carbon dioxide mass transfer according to claim 1, characterized in that, The inner walls of the first clamping plate and the second clamping plate are provided with grooves, the cathode plate is located in the groove of the first clamping plate, and the anode plate is located in the groove of the second clamping plate.

4. The flow-type electrolysis device for enhancing carbon dioxide mass transfer according to claim 1, characterized in that, It also includes gaskets; The first clamping plate and the second clamping plate are provided with water-stop grooves, and the gasket is located in the water-stop grooves of the first clamping plate and the second clamping plate.

5. The flow electrolysis device for enhancing carbon dioxide mass transfer according to claim 4, characterized in that, The diameter of the water-stop groove is 0.5mm-5mm.

6. The flow-type electrolysis device for enhancing carbon dioxide mass transfer according to claim 4, characterized in that, The gasket is made of one of the following materials: silicone, fluoropolymer, or polytetrafluoroethylene.

7. The flow electrolysis device for enhancing carbon dioxide mass transfer according to claim 1, characterized in that, The clamping assembly also includes connecting bolts; Bolt holes are provided on the outer edges of the first clamping plate and the second clamping plate. The first clamping plate and the second clamping plate clamp the electrode assembly and the bipolar plate in the middle by the connecting bolts.

8. The flow-type electrolysis device for enhancing carbon dioxide mass transfer according to claim 1, characterized in that, The mixed-phase solution introduced into the flow electrolysis device includes an electrolyte containing dissolved carbon dioxide gas, wherein the electrolyte is one or more of potassium carbonate, potassium sulfate, and potassium chloride.

9. The flow-type electrolysis device for enhancing carbon dioxide mass transfer according to claim 1, characterized in that, The bipolar plate material includes one of 304 stainless steel, 316 stainless steel, titanium plate, and iron plate.

10. An application of a flow-type electrolysis device that enhances carbon dioxide mass transfer, characterized in that, The applications include using the enhanced carbon dioxide mass transfer flow electrolysis device according to any one of claims 1-9 in electrocatalytic carbon dioxide reduction and gas-liquid flow electrochemical conversion.

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