Luggin capillary gas diffusion electrolytic tank

Abstract

The utility model relates to the technical field of electrochemistry, and discloses a Luggin capillary gas diffusion electrolytic cell, which comprises a working electrode, a Luggin capillary, a Nafion tube, a reference electrode, a counter electrode and electrolyte, the gas diffusion electrolytic cell further comprises a thermometer and an exhaust passage, the outer wall of the Luggin capillary is fixedly connected to the bottom side of the gas diffusion electrolytic cell, and the outer wall of the Nafion tube is fixedly connected to the bottom side of the gas diffusion electrolytic cell. The Nafion tube is arranged in an opening, close to the end of the working electrode, of the Luggin capillary tube in a penetrating manner, the working electrode, the reference electrode and the counter electrode are all arranged in the electrolyte, and the counter electrode and the working electrode are oppositely arranged in the electrolytic tank body. According to the utility model, the Luggin capillary tube is fixedly arranged on the bottom side of the gas diffusion electrolytic tank, so that the solution resistance reduction effect of the Luggin capillary tube is exerted, the uniform distribution of electric field lines between the working electrode and the counter electrode is not influenced, the uniformity of an electric field between the working electrode and the counter electrode is ensured, and more accurate data can be obtained.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical technology, and in particular to a Lugin capillary gas diffusion electrolytic cell. Background Technology

[0002] In the field of electrochemical technology, gas diffusion electrolytic cells play an important role in the testing of various planar electrode materials. Their testing accuracy is directly related to the reliability of research results. With the increasing demands for electrochemical testing in fields such as new energy and material corrosion research, the optimization of the performance of gas diffusion electrolytic cells has become a key research direction.

[0003] The traditional Luggin capillary is a common component connecting the reference electrode and the working electrode. It is generally designed as a thin glass tube. When in use, the tip is close to the working electrode, and the other end is inserted into the reference electrode. The whole tube is then placed into a gas diffusion electrolysis cell. Because the depth and angle of insertion into the gas diffusion electrolysis cell are difficult to control precisely each time, the position of the Luggin capillary in the electrolysis cell is unstable, making it impossible to obtain more accurate data. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a Luggin capillary gas diffusion electrolytic cell, which aims to improve the traditional Luggin capillary, which is difficult to control precisely, resulting in unstable position of the Luggin capillary in the electrolytic cell and making it impossible to obtain more accurate data.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A Luggin capillary gas diffusion electrolytic cell includes a working electrode, a Luggin capillary, a Nafion tube, a reference electrode, a counter electrode, and an electrolyte. The gas diffusion electrolytic cell also includes a thermometer and an exhaust channel. The outer wall of the Luggin capillary is fixedly connected to the bottom side of the gas diffusion electrolytic cell. One end of the working electrode has an opening. The Nafion tube passes through the opening of the Luggin capillary near the working electrode end. Electric field lines are arranged inside the electrode. The working electrode, reference electrode, and counter electrode are all disposed inside the electrolyte. The counter electrode and working electrode are disposed opposite each other within the electrolytic cell body.

[0007] Preferably, the number of openings in the working electrode is between 2 and 10.

[0008] Preferably, the reference electrode is electrically connected to the electrolyte near the working electrode via a Lugin capillary tube and a Nafion tube.

[0009] Preferably, the outer wall of the thermometer is fixedly connected to the inner wall of the electrolytic cell body, and the detection end is immersed in the electrolyte.

[0010] Preferably, the outer diameter of the Nafion tube is between 0.3 mm and 1.3 mm, which is compatible with the opening of the Lugin capillary tube.

[0011] Preferably, the top of the electrolytic cell body is provided with an exhaust channel, which is connected to the interior of the electrolytic cell body.

[0012] Preferably, the working electrode, reference electrode, and counter electrode are all connected to an external electrochemical testing device via wires.

[0013] Preferably, the opening diameter of each capillary of the working electrode is 0.5mm-1.5mm.

[0014] Preferably, a sealing gasket is provided between the reference electrode and the counter electrode.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, a Luggin capillary is fixedly installed on the bottom side of the gas diffusion electrolysis cell and opened very close to the working electrode. This not only gives full play to the function of Luggin capillary in reducing solution resistance, but also does not affect the uniform distribution of electric field lines between the working electrode and the counter electrode, thus ensuring the uniformity of the electric field between the working electrode and the counter electrode and obtaining more accurate data.

[0017] 2. In this utility model, by fixing the Luggin capillary to the bottom side of the gas diffusion electrolysis cell, the position of the Luggin capillary is fixed and reproduced in each test, avoiding the test differences caused by the change in insertion depth and angle of the traditional Luggin capillary, simplifying the loading process of the reference electrode, and thus increasing the reproducibility of electrochemical tests.

[0018] 3. In this invention, a Nafion capillary tube with multiple Luggin capillary openings is added inside the Luggin capillary lumen. Utilizing the unique proton conductivity of the Luggin capillary tube, this invention solves the problem of complex assembly and the risk of air bubbles causing open circuits associated with traditional Luggin capillary tubes. During testing, it ensures stable ion conduction, guarantees the electrical connection between the reference electrode and the working electrode, and ensures smooth testing. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a Lujin capillary gas diffusion electrolytic cell proposed in this utility model.

[0020] Figure 2 This is a partial structural schematic diagram of an electrochemical testing device for a Lugin capillary gas diffusion electrolytic cell proposed in this utility model.

[0021] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 4 This is a partial structural diagram showing the number of openings on the electrode of a Lujin capillary gas diffusion electrolytic cell proposed in this utility model.

[0023] Legend:

[0024] 1. Working electrode; 2. Number of openings at the electrode end; 3. Nafion tube; 4. Luggin capillary tube; 5. Electrochemical testing device; 6. Reference electrode; 7. Thermometer; 8. Electric field lines; 9. Exhaust channel; 10. Counter electrode; 11. Electrolyte. Detailed Implementation

[0025] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Reference Figures 1-3 An embodiment of this utility model is provided: a Luggin capillary gas diffusion electrolytic cell, including a working electrode 1, a Luggin capillary 4, a Nafion tube 3, a reference electrode 6, a counter electrode 10, and an electrolyte 11. The gas diffusion electrolytic cell also includes a thermometer 7 and an exhaust channel 9. The outer wall of the Luggin capillary 4 is fixedly connected to the bottom side of the gas diffusion electrolytic cell. One end of the working electrode 1 is provided with an opening. The Nafion tube 3 passes through the opening of the Luggin capillary 4 near the end of the working electrode 1. Electric field lines 8 are provided inside the electrode 10. The working electrode 1, the reference electrode 6, and the counter electrode 10 are all disposed inside the electrolyte 11. The counter electrode 10 and the working electrode 1 are disposed opposite each other in the body of the electrolytic cell.

[0027] Specifically, the outer wall of the Lugin capillary 4 is fixed to the bottom side of the gas diffusion electrolysis cell, with an opening near the working electrode 1. Utilizing capillary action, the electrolyte 11 flows through the opening to the interface between the working electrode 1 and the reference electrode 6, effectively reducing solution resistance and minimizing potential errors caused by solution resistance. Furthermore, it does not affect the uniform distribution of the electric field lines 8 between the working electrode 1 and the counter electrode 10, ensuring electric field uniformity and thus improving the accuracy of electrochemical testing. The number of openings 2 at the electrode ends is the number of openings near the working electrode 1 of the Lugin capillary 4. The Nafion tube 3 passes through the opening near the working electrode 1 of the Lugin capillary 4, solving the problems of complex assembly and easy residual air bubbles causing open circuits in traditional Lugin capillary 4.

[0028] Reference Figure 1The reference electrode 6 is electrically connected to the electrolyte 11 near the working electrode 1 through the Lugin capillary 4 and the Nafion tube 3; the outer wall of the thermometer 7 is fixedly connected to the inner wall of the electrolytic cell body, and the detection end is immersed in the electrolyte 11; the outer diameter of the Nafion tube 3 is between 0.3mm and 1.3mm, and is adapted to the opening of the Lugin capillary 4.

[0029] Specifically, the Nafion tube 3, by utilizing its own proton conductivity, can effectively solve the problems of complex assembly and easy residual air bubbles causing open circuits in the traditional Luggin capillary tube 4 within this outer diameter range. At the same time, it ensures good ion conduction performance, making the electrical connection between the reference electrode 6 and the working electrode 1 more stable and reliable, thereby improving the accuracy and reproducibility of electrochemical testing. The thermometer 7 can accurately monitor the temperature of the electrolyte 11 in real time.

[0030] Reference Figure 1 and Figure 4 The top of the electrolytic cell body is provided with an exhaust channel 9, which is connected to the interior of the electrolytic cell body; the working electrode 1, the reference electrode 6, and the counter electrode 10 are all connected to the external electrochemical testing device 5 through wires; the opening diameter of each capillary of the working electrode 1 is 0.5mm-1.5mm; a sealing gasket is provided between the reference electrode 6 and the counter electrode 10.

[0031] Specifically, the sealing gasket between the reference electrode 6 and the counter electrode 10 provides a good seal, and the reference electrode 6 provides a stable potential reference for the electrochemical testing device 5, ensuring the accuracy of measuring the potential of the working electrode 1.

[0032] Working principle: When using this Luggin capillary gas diffusion electrolysis cell, first place the nickel felt electrode to be tested at the working electrode 1 position, add an appropriate amount of electrolyte 11 to the electrolysis cell, insert the reference electrode 6 (such as a reversible hydrogen RHE reference electrode), then connect the electrochemical testing device 5 (such as an electrochemical workstation), and set the electrochemical testing program and parameters. The Luggin capillary 4 is fixed to the bottom side of the gas diffusion electrolysis cell, with the number of openings near the working electrode 1 between 2 and 10, and the opening diameter between 0.5 mm and 1.5 mm. The Luggin capillary 4 utilizes capillary action to allow the electrolyte 11 to flow through the opening to the interface between the working electrode 1 and the reference electrode 6, reducing solution resistance without affecting the uniform distribution of the electric field lines 8 between the working electrode 1 and the counter electrode 10. A Nafion tube 3 with an outer diameter between 0.3 mm and 1.3 mm is inserted into the opening of the Luggin capillary 4. Utilizing the proton conductivity of Nafion, this ensures ion conduction while solving the problems of complex assembly and the tendency for residual air bubbles to cause open circuits associated with traditional Luggin capillary 4 systems. Throughout the test, the thermometer 7 monitors the temperature of the electrolyte 11 in real time, and the exhaust channel 9 is used to discharge gases generated during electrolysis, ensuring a stable test environment. Through this structure and operation, this Luggin capillary 4 gas diffusion electrolytic cell can perform various electrochemical tests, such as cyclic voltammetry (CV) and linear sweep voltammetry (LSV), just like a conventional gas diffusion electrolytic cell. It also reduces the solution resistance between the reference electrode 6 and the working electrode 1, improving the reproducibility of multiple tests.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A Lugin capillary gas diffusion electrolytic cell, characterized in that: The gas diffusion electrolytic cell includes a working electrode (1), a Luggin capillary (4), a Nafion tube (3), a reference electrode (6), a counter electrode (10), and an electrolyte (11). The gas diffusion electrolytic cell also includes a thermometer (7) and an exhaust channel (9). The outer wall of the Luggin capillary (4) is fixedly connected to the bottom side of the gas diffusion electrolytic cell. One end of the working electrode (1) is provided with an opening. The Nafion tube (3) passes through the opening of the Luggin capillary (4) near the working electrode (1). Electric field lines (8) are provided inside the electrode (10). The working electrode (1), the reference electrode (6), and the counter electrode (10) are all located inside the electrolyte (11). The counter electrode (10) and the working electrode (1) are arranged opposite to each other in the body of the electrolytic cell.

2. The Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, The number of openings in the working electrode (1) is between 2 and 10.

3. The Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, The reference electrode (6) is electrically connected to the electrolyte (11) near the working electrode (1) through the Lugin capillary (4) and the Nafion tube (3).

4. The Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, The outer wall of the thermometer (7) is fixedly connected to the inner wall of the electrolytic cell body, and the detection end is immersed in the electrolyte (11).

5. The Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, The outer diameter of the Nafion tube (3) is between 0.3 mm and 1.3 mm, which is compatible with the opening of the Lugin capillary tube (4).

6. The Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, The top of the electrolytic cell body is provided with an exhaust channel (9), which is connected to the interior of the electrolytic cell body.

7. The Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, The working electrode (1), reference electrode (6), and counter electrode (10) are all connected to the external electrochemical testing device (5) via wires.

8. The Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, The working electrode (1) has an opening diameter of 0.5mm-1.5mm for each capillary.

9. A Lugin capillary gas diffusion electrolytic cell according to claim 1, characterized in that, A sealing gasket is provided between the reference electrode (6) and the counter electrode (10).

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