A carbon dioxide electrochemical reduction device

Abstract

The present invention patent discloses an electrochemical reduction device, which has a working electrode, a counter electrode and a reference electrode design, a carbon dioxide inlet and a reaction product outlet, and an electrolyte inlet and outlet, and is used for electrochemically reducing carbon dioxide into hydrocarbon fuels. The present invention patent fixes and isolates the anode and cathode reaction chambers in the electrochemical reduction process separately, so that the working electrode and the counter electrode can be replaced at any time according to the experimental requirements without affecting the experiment. At the same time, it has a reference electrode design. The three-electrode electrochemical device is conducive to improving the stability of the electrical signal in the test, suitable for observation in the long-term cycle process, and easy to install and disassemble, easy to maintain, and easy to operate. It is not only suitable for experienced scientific researchers, but also suitable for beginners.

Description

Technical Field

[0001] The invention relates to a carbon dioxide electrochemical reduction device, which belongs to the field of energy material testing and research. The device has a working electrode, a counter electrode and a reference electrode fixed design, a carbon dioxide inlet and a reaction product outlet, and an electrolyte inlet and outlet. It is used to electrochemically reduce carbon dioxide into hydrocarbon fuels. The instrument device involved in the invention fixes and isolates the anode and cathode reaction chambers in the electrochemical reduction process respectively, so that the working electrode and the counter electrode can be replaced at any time according to the experimental requirements without affecting the experiment. At the same time, it has a reference electrode design. The three-electrode electrochemical device is conducive to improving the stability of the electrical signal in the test and is suitable for observation during long-term circulation. Background Art

[0002] The rapid development of global industry and human activities have led to a significant increase in greenhouse gas emissions, and the earth's ecological environment is suffering irreversible damage. As the main representative component of greenhouse gases, how to convert carbon dioxide into hydrocarbon fuels has attracted the attention of scientists around the world. Electrochemical catalytic reduction of carbon dioxide is an effective method of chemical energy storage and has great application potential because it can be carried out at room temperature and pressure and can achieve an artificial closed carbon cycle. During the electrocatalytic process, carbon dioxide is initially activated and new carbon-carbon bonds are formed on the catalyst surface attached to the working electrode. This process is affected by the catalyst surface structure (nano and mesoscopic scale) and electrolyte effects (pH value, buffer strength, ion effects), resulting in different final products, yields and side reactions. Currently, research on the electrocatalytic reduction of carbon dioxide is very active. The devices used have been gradually upgraded from the initial open type, such as the "A carbon dioxide reduction device" disclosed in the Chinese utility patent with authorization publication number CN 2016201806791, to the closed type, such as the "Method and device for electrochemical reduction of carbon dioxide" disclosed in the invention patent with authorization publication number CN108603298B, and the "Method and device for electrochemical reduction of carbon dioxide" disclosed in the invention patent with authorization publication number CN103119017B.

[0003] At present, the design of the electrochemical catalytic reduction of carbon dioxide device is relatively uniform, and the method of use is similar. It is mainly to install and fix all the parts one by one through a metal frame composed of four metal rods. The disadvantage of this device is that the catalyst and ion exchange membrane cannot be replaced during the reaction, which is inconvenient to use. In summary, the electrochemical reaction can be accurately regulated by the three-electrode method, and the electrochemical reduction device of carbon dioxide with good airtightness, convenient installation and use is still missing. In order to make up for the shortcomings of the current testing method, the patent of the present invention proposes a design in which the anode and cathode reaction chambers in the electrochemical reduction process are fixed and isolated respectively, so that the working electrode and the counter electrode can be replaced at any time according to the experimental requirements without affecting the progress of the experiment. The three-electrode electrochemical device is conducive to improving the stability of the electrical signal in the test, suitable for observation during long-term circulation, and easy to install and disassemble, easy to maintain and easy to operate. Summary of the invention

[0004] As described above, in view of the problem that there is still a lack of a carbon dioxide electrochemical reduction device that is easy to install and use, the present invention provides a design in which the anode and cathode reaction chambers in the electrochemical reduction process are fixed and isolated respectively, so that the working electrode and the counter electrode can be replaced at any time according to the experimental requirements without affecting the experiment. To achieve the above purpose, the technical solution adopted by the present invention is: the device is composed of two independent left chambers (001) and right chambers (002), the left chamber has a liquid inlet (01) and a liquid outlet (02), and also has a gas inlet (03) and a gas outlet (04), the liquid inlet (01) and the liquid outlet (02) are respectively installed at the bottom and the top of the left chamber body (05), the gas inlet (03) and the gas outlet (04) are installed on the left chamber electrode cover (06), the left chamber body (05) and the left chamber electrode cover (06) are connected by screws to form an independent module, and the left chamber electrode cover (06) The left chamber body (05) is provided with an electrode connection column (07); a flow guide collector (08) is placed between the left chamber body (05) and the left chamber electrode cover (06); the left chamber is sealed by two sealing gaskets placed between the left chamber body (05), the left chamber electrode cover (06) and the flow guide collector (08); the upper part of the left chamber body (05) is provided with a connection hole (09) for placing a reference electrode; the right chamber body (10) is provided with a liquid inlet (11) and a liquid outlet (12); the right chamber electrode cover (06) is provided with a liquid inlet (11) and a liquid outlet (12); the left chamber body (05 ... body (05) is provided with a liquid in (13) is provided with another electrode connecting column (14), another current collector (15) is placed between the right chamber body (10) and the right chamber electrode cover (13), the right chamber is sealed by a sealing gasket placed in the right chamber body (10), the right chamber body (10) and the right chamber electrode cover (13) are fixed by screws to form an independent module, the module where the left chamber body (05) is located is connected to the module where the right chamber body (10) is located by screws, and a sealing gasket is placed between the two for sealing.

[0005] The size of the device body can be changed as needed to meet the requirements of different experiments on the reaction volume.

[0006] The connection between the liquid inlet (01) and liquid outlet (02) of the left chamber and the liquid inlet (11) and liquid outlet (12) of the right chamber body of the above-mentioned device adopts a compression seal or a quick-plug connection.

[0007] The connection hole (09) on the upper part of the left chamber body (05) fixes the reference electrode therein, and the position of the reference electrode in the left chamber body (05) is adjusted by moving the reference electrode up and down.

[0008] The gas inlet (03) and the gas outlet (04) on the left chamber electrode cover (06) are sealed by a compression seal, or by a quick-plug connection, and are sealed with the guide collector (08) by an O-ring.

[0009] The side surface of the guide collector (08) has a groove, which guides the gas and enables the gas to fully contact with the catalyst material.

[0010] The above-mentioned electrode connection posts (07) (14) are all of hidden design. The main body of the electrode connection post is hidden inside the left chamber electrode cover (06) and the right chamber electrode cover (13) to reduce the short circuit caused by improper operation. The electrode connection post is in contact with the guide current collector (08) and another current collector (15) respectively. There is a groove inside the electrode connection post, which can be directly connected to the banana plug for connecting to the external circuit.

[0011] The above device is composed of two independent left chambers (001) and right chambers (002). The two left chambers (001) and the two right chambers (002) can be used as a carbon dioxide electrochemical reduction device according to needs. The beneficial effect of the patent of the present invention is to provide a carbon dioxide electrochemical reduction device with replaceable electrode sheets, diaphragms and electrolytes. The sample table is easy to assemble and maintain, and is suitable for long-term cycle testing and repeated use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1. Schematic diagram of the cross section of the device.

[0014] Figure 2. Schematic diagram of the overall appearance of the device.

[0015] Figure 3. Schematic diagram of the flow collector.

[0016] Figure 4. Left side view of the device.

[0017] Figure 5. Right side view of the device.

[0018] Figure 6. Side view of the device.

[0019] Figure 7. Top view of the device.

[0020] Figure 8. Schematic diagram of the appearance of the device consisting of two right chambers.

[0021] Figure 9. Figure 8 Cross-sectional view of the device.

[0022] In the figure, 001. left chamber, 002. right chamber, 01. left chamber liquid inlet, 02. left chamber liquid outlet, 03. left chamber gas inlet, 04. left chamber gas outlet, 05. left chamber body, 06. left chamber electrode cover, 07. left chamber electrode connecting column, 08. left chamber guide current collector, 09. connecting hole, 10. right chamber body, 11. right chamber liquid inlet, 12. right chamber liquid outlet, 13. right chamber electrode cover, 14. right chamber electrode connecting column, 15. right chamber current collector. DETAILED DESCRIPTION

[0023] [Example 1]

[0024] The carbon dioxide electrochemical reduction device involved in the patent of this invention performs electrochemical reduction of carbon dioxide and is suitable for a three-electrode test system.

[0025] like Figure 1 to Figure 7It is shown that the device involved in the patent of the present invention is composed of two independently existing left chambers (001) and right chambers (002). When in use, the left chamber body (05) is laid flat, and the sealing gasket, the catalyst carrier to be tested, the guide current collector (08), another sealing gasket and the left chamber electrode cover (06) are assembled in sequence. After being fixed with screws, the electrode connecting column is tightened, the gas pipes of the gas inlet (03) and the gas outlet (04), the reference electrode and the pipes at the liquid inlet (01) and the liquid outlet (02). Then the right chamber body (10) is laid flat, and the sealing gasket, the test electrode, the current collector (15), and the left chamber electrode cover (13) are assembled in sequence. After being fixed with screws, the electrode connecting column is tightened, and the pipes at the liquid inlet (11) and the liquid outlet (12) are tightened. After being assembled separately, the module where the left chamber body (05) is located is connected to the module where the right chamber body (10) is located by screws, and a diaphragm and a sealing gasket are placed between the two. When in use, the device is connected to a carbon dioxide cylinder, a peristaltic pump, and an electrochemical workstation, and the electrochemical reduction reaction of carbon dioxide can be achieved under different catalyst conditions.

[0026] [Example 2]

[0027] The device involved in the present invention is composed of two independently assembled chambers, and the two chambers have different structures. In addition to the left chamber and the right chamber being used together as described in Example 1, the two right chambers can be combined together for use. Figure 8 The method of use is similar to that of Example 1. The two sides of the chamber are connected to an external electrochemical workstation through electrode connection columns. Each chamber has an air inlet / liquid port and an air / liquid outlet to facilitate the entry and exit of reactants and products.

Claims

1. A carbon dioxide electrochemical reduction device, characterized in that: The device is composed of two independent left chambers (001) and right chambers (002). The left chamber has a liquid inlet (01) and a liquid outlet (02), and also has a gas inlet (03) and a gas outlet (04). The liquid inlet (01) and the liquid outlet (02) are respectively installed at the bottom and the top of the left chamber body (05). The gas inlet (03) and the gas outlet (04) are installed on the left chamber electrode cover (06). The left chamber body (05) and the left chamber electrode cover (06) are connected by screws to form an independent module. The left chamber electrode cover (06) has an electrode connecting column (07). A flow guide collector (08) is placed between the left chamber body (05) and the left chamber electrode cover (06). Through two electrodes placed on the left chamber body (05), the left The left chamber is sealed by a sealing gasket between the chamber electrode cover (06) and the guide current collector (08); the upper part of the left chamber body (05) is provided with a connection hole (09) for placing a reference electrode; the right chamber body (10) is provided with a liquid inlet (11) and a liquid outlet (12); the right chamber electrode cover (13) is provided with another electrode connection column (14); another current collector (15) is placed between the right chamber body (10) and the right chamber electrode cover (13); the right chamber is sealed by a sealing gasket placed in the right chamber body (10); the right chamber body (10) and the right chamber electrode cover (13) are fixed by screws to form an independent module; the module where the left chamber body (05) is located is connected to the module where the right chamber body (10) is located by screws, and a sealing gasket is placed between the two for sealing.

2. A carbon dioxide electrochemical reduction device according to claim 1, characterized in that: The size of the device body can be changed as needed to meet the requirements of different experiments on reaction volume.

3. The carbon dioxide electrochemical reduction device according to claim 1, characterized in that: The connection mode at the liquid inlet (01) and liquid outlet (02) of the left chamber and the liquid inlet (11) and liquid outlet (12) of the right chamber body is a compression seal or a quick-insert connection mode.

4. The carbon dioxide electrochemical reduction device according to claim 1, characterized in that: The connection hole (09) on the upper part of the left chamber body (05) fixes the reference electrode therein, and the position of the reference electrode in the left chamber body (05) is adjusted by moving the reference electrode up and down.

5. The carbon dioxide electrochemical reduction device according to claim 1, characterized in that: The gas inlet (03) and the gas outlet (04) on the left chamber electrode cover (06) are sealed by a compression seal or a quick-plug connection, and are sealed with the guide collector (08) by an O-ring.

6. The carbon dioxide electrochemical reduction device according to claim 1, characterized in that: The side surface of the guide collector (08) has a groove, which guides the gas and enables the gas to fully contact with the catalyst material.

7. The carbon dioxide electrochemical reduction device according to claim 1, characterized in that: The electrode connection posts (07) and (14) are both of concealed design. The main body of the electrode connection post is hidden inside the left chamber electrode cover (06) and the right chamber electrode cover (13) to reduce the short circuit caused by improper operation. The electrode connection post is in contact with the guide current collector (08) and another current collector (15) respectively. There is a groove inside the electrode connection post, which is directly connected to the banana plug for connecting to the external circuit.

8. The carbon dioxide electrochemical reduction device according to claim 1, characterized in that: The device is composed of two independent left chambers (001) and right chambers (002). The two left chambers (001) and the two right chambers (002) respectively constitute a carbon dioxide electrochemical reduction device for use as needed.

Images