Oxygen evolution reaction experimental device

Abstract

The utility model relates to the technical field of experimental devices, in particular to an oxygen evolution reaction experimental device which comprises a reaction device, the reaction device comprises a reaction box, a plurality of optical detection devices are arranged at the bottom of the reaction box, a top cover is arranged at the top of the reaction box, a plurality of insertion sleeves are arranged on the top cover, and electrode assemblies are arranged in the middles of the insertion sleeves. A gas collecting device is arranged outside the bottom of the inserting sleeve. According to the utility model, through the work of the sucking pump, air in the collecting sleeve can be pumped by using the exhaust pipe, so that the liquid level of electrolyte rises to the first liquid level sensor, and after an experiment is started, all oxygen is collected in the collecting sleeve at an experiment electrode, so that the gas volume measurement precision is improved; the reaction is stopped when the liquid level drops to the second liquid level sensor, so that the same gas volume obtained in each experiment can be ensured, and the oxygen evolution reaction current can be conveniently calculated.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental devices, in particular to an oxygen evolution reaction experimental device. Background Art

[0002] Energy crisis and environmental pollution are common problems that the world is currently facing and urgently needs to solve. The need to find new clean energy sources is becoming increasingly urgent. Hydrogen energy, as an efficient and clean renewable energy source, has a high energy density and can achieve zero emissions and no pollution during use. Water electrolysis is currently an important means of industrial hydrogen production. Due to the slow kinetics of the oxygen evolution reaction (OER) at the anode, its development in practical applications has been seriously hindered. Therefore, people have been looking for efficient oxygen evolution reaction catalytic materials. The research on oxygen evolution reaction catalytic materials generally uses an oxygen evolution reaction device to measure the catalytic effect of the oxygen evolution reaction by evaluating the amount and rate of oxygen evolution.

[0003] Application No. 202320977284.4 provides a nickel hydroxide nanosheet oxygen evolution reaction device, which includes a reaction tank body for loading electrolyte, a liquid inlet provided on the top of the reaction tank body, a liquid outlet provided on the bottom, and three electrode mounting grooves provided on the top of the reaction tank body. Electrode assemblies are plugged into and connected to the electrode mounting grooves. Nickel hydroxide nanosheets, a reference electrode and an auxiliary electrode are respectively provided at the bottom of the electrode assembly. A gas collecting sleeve is fixedly connected to the bottom of the electrode mounting groove where the nickel hydroxide nanosheet is located.

[0004] The gas collecting tube sleeve of the device is connected to a gas detection module through a collecting tube on the side. The gas detection module includes a gas collecting bottle, which is connected to the collecting tube through a U-shaped tube. Liquid is provided in the gas collecting bottle. The device calculates the oxygen evolution reaction current of the nickel hydroxide nanosheets based on the gas volume measured by the gas detection module. However, when the gas collecting bottle is inverted, it is difficult for oxygen to enter the gas collecting bottle through the U-shaped tube and discharge the liquid in the gas collecting bottle. At the same time, since the density of oxygen is greater than that of air, most of the gas entering the gas collecting bottle is air, and the air gathers at the bottom of the gas collecting bottle. Therefore, the gas volume measured by the gas collecting bottle is not the volume of oxygen, which affects the accuracy of the experimental results. Utility Model Content

[0005] In order to make up for the above deficiencies, the utility model provides an oxygen evolution reaction experimental device.

[0006] The technical solution of the utility model is:

[0007] An oxygen evolution reaction experimental device, comprising:

[0008] A reaction device, comprising a reaction box for containing electrolyte, a plurality of optical detection devices provided at the bottom of the reaction box for detecting the generation of reaction bubbles, a top cover provided at the top of the reaction box, a plurality of insert sleeves provided on the top cover, an electrode assembly provided in the middle of the insert sleeves, and a gas collection device provided on the outer side of the bottom of the insert sleeves;

[0009] There are three groups of electrode assemblies, each group of electrode assemblies includes a power connection assembly, the power connection assembly is slidably installed in the insertion sleeve, and an electrode is provided at the bottom of the power connection assembly. When the electrode is energized, it can electrolyze the electrolyte to produce hydrogen and oxygen;

[0010] The gas collection device includes a collection sleeve, the top of the collection sleeve is threadedly connected to the bottom of the insertion sleeve, an exhaust pipe is provided at the top of the side of the collection sleeve and below the insertion sleeve, the exhaust pipe passes upward through the top cover and is connected to an exhaust assembly, and the exhaust assembly is used to drain the air in the collection sleeve.

[0011] Preferably, a liquid drain port and a liquid inlet are symmetrically provided on the side of the reaction box, and the liquid inlet is higher than the liquid drain port.

[0012] Preferably, the power connection assembly includes an insulating sleeve, which is slidably connected to the insertion sleeve. A power connection post is provided through the center of the insulating sleeve, and the power connection post is used to connect to a power source.

[0013] Preferably, the electrodes include a hydrogen evolution electrode, an experimental electrode and a reference electrode, the electrodes are fixedly mounted on the bottom of the connection post by locking screws, and a potential scanning device is connected between the experimental electrode and the connection post above the hydrogen evolution electrode.

[0014] Preferably, a limiting ring is provided at the inner top of the collecting sleeve, the electrode passes through the center of the limiting ring and is inserted into the electrolyte, the top surface of the limiting ring is against the bottom surface of the insertion sleeve, and the upper edge of the exhaust pipe is flush with the bottom surface of the limiting ring.

[0015] Preferably, the air extraction component includes a solenoid valve, one end of the solenoid valve is connected to the top end of the exhaust pipe, and the other end is connected to the air extraction pump, and the solenoid valve is used to control the on-off of the exhaust pipe.

[0016] Preferably, a first liquid level sensor and a second liquid level sensor are provided on the side of the collecting sleeve outside the experimental electrode and the reference electrode, and the first liquid level sensor and the second liquid level sensor are used to detect the liquid level height in the collecting sleeve.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model can use the exhaust pipe to drain the air in the collection sleeve through the operation of the vacuum pump, so that the electrolyte liquid level rises to the first liquid level sensor, ensuring that after the experiment starts, all the oxygen collected in the collection sleeve at the experimental electrode is oxygen, thereby improving the gas volume measurement accuracy. When the liquid level drops to the second liquid level sensor, the reaction stops, which can ensure that the gas volume obtained in each experiment is the same, and facilitates the calculation of the oxygen evolution reaction current. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the reaction device in the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the electrode assembly in the utility model;

[0022] Figure 4 This is a schematic structural diagram of the gas collection device in the utility model.

[0023] The meaning of each number in the figure is:

[0024] 1. Reaction device; 11. Reaction box; 12. Heightening pad; 13. Liquid discharge port; 14. Liquid inlet; 15. Top cover; 16. Insert sleeve; 17. Optical detection device;

[0025] 2. Electrode assembly; 21. Insulation sleeve; 22. Connection post; 23. Locking screw; 24. Hydrogen evolution electrode; 25. Experimental electrode; 26. Reference electrode; 27. Potential scanning device;

[0026] 3. Gas collection device; 31. Collection sleeve; 32. Limiting ring; 33. Exhaust pipe; 34. Solenoid valve; 35. Air pump; 36. First liquid level sensor; 37. Second liquid level sensor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] Example 1:

[0030] See also Figure 1-4 The present invention describes the above technical solution in detail through the following embodiments:

[0031] An oxygen evolution reaction experimental device, comprising:

[0032] The reaction device 1 includes a reaction box 11, which is used to hold electrolyte. A plurality of optical detection devices 17 are provided at the bottom of the reaction box 11. The optical detection devices 17 are used to detect the generation of reaction bubbles. A top cover 15 is provided on the top of the reaction box 11. Three insertion sleeves 16 are provided on the top cover 15. An electrode assembly 2 is provided in the middle of the insertion sleeve 16. A gas collection device 3 is provided on the outside of the bottom of the insertion sleeve 16.

[0033] The reaction box 11 is made of a non-conductive transparent material, such as acrylic or tempered glass, which can facilitate the experimenter to observe the experimental status. The bottom surface of the reaction box 11 is provided with a heightening pad 12, which is used to elevate the reaction box 11.

[0034] The optical detection device 17 is attached to the bottom surface of the reaction box 11. The optical detection device 17 detects the generation of reaction bubbles according to the change of light intensity in the electrolyte during reflection / refraction of light, and further obtains the starting potential of the oxygen evolution reaction when the refractive index changes.

[0035] The top cover 15 is snap-fitted to the reaction box 11. The insert sleeve 16 and the top cover 15 are made of the same non-conductive transparent material and are integrally formed.

[0036] A liquid discharge port 13 and a liquid inlet 14 are symmetrically provided on the side of the reaction box 11 , and the liquid inlet 14 is higher than the liquid discharge port 13 .

[0037] The inlet 14 is used to inject the electrolyte, and the outlet 13 is used to discharge the electrolyte. Valves should be provided at the outlet 13 and the inlet 14. The electrolyte is preferably 1M KOH, i.e., a potassium hydroxide solution with a concentration of 1 mole per liter.

[0038] There are three groups of electrode assemblies 2. Each group of electrode assemblies 2 includes a power connection assembly. The power connection assembly is slidably installed in the insertion sleeve 16. Electrodes are provided at the bottom of the power connection assembly. When the electrodes are energized, they can electrolyze the electrolyte to produce hydrogen and oxygen.

[0039] The power connection assembly includes an insulating sleeve 21, which is slidably connected to the insertion sleeve 16. A power connection post 22 is provided through the center of the insulating sleeve 21, and the power connection post 22 can be used for power connection.

[0040] The insulating sleeve 21 is made of ceramic and has an interference fit with the insert sleeve 16, ensuring a tight seal. The contact pins 22 are preferably made of copper. One of the three contact pins 22 connects to the negative terminal of the power supply, while the other two connect to the positive terminal of the power supply.

[0041] The electrodes include a hydrogen evolution electrode 24, an experimental electrode 25 and a reference electrode 26. The electrodes are fixed to the bottom of the connection post 22 by locking screws 23. A potential scanning device 27 is connected between the experimental electrode 25 and the connection post 22 above the hydrogen evolution electrode 24 through a wire.

[0042] During the reaction, hydrogen evolution electrode 24 is connected to the negative electrode, and test electrode 25 is connected to the positive electrode, forming a circuit with the electrolyte. When the potential reaches the reaction initiation potential, hydrogen is generated at hydrogen evolution electrode 24, and oxygen is generated outside test electrode 25. The bubbles that initially form outside test electrode 25 are relatively small and cannot be observed with the naked eye. Detection of the bubbles by optical detection device 17 indicates the onset of the hydrogen and oxygen evolution reactions, allowing for accurate measurement of the initiation potential.

[0043] The hydrogen evolution electrode 24 is made of platinum and the reference electrode 26 is made of saturated calomel electrode. During the experiment, the potential scanning device 27 can detect the potential difference between the experimental electrode 25 and the hydrogen evolution electrode 24 when they participate in the reaction.

[0044] The gas collection device 3 includes a collection sleeve 31, the top of the collection sleeve 31 is threadedly connected to the bottom of the insertion sleeve 16, and an exhaust pipe 33 is provided at the top of the side of the collection sleeve 31 and below the insertion sleeve 16. The exhaust pipe 33 passes upward through the top cover 15 and is connected to an exhaust assembly, which is used to drain the air in the collection sleeve 31.

[0045] The collecting sleeve 31 is made of tempered glass.

[0046] When the reaction occurs, the hydrogen generated on the surface of the hydrogen evolution electrode 24 can be discharged from the exhaust pipe 33 for easy collection.

[0047] The oxygen generated by the experimental electrode 25 will gather at the top of the collection sleeve 31. Since the air in the collection sleeve 31 has been drained by the exhaust assembly, all the air collected in the collection sleeve 31 is oxygen.

[0048] A limiting ring 32 is provided on the inner top of the collecting sleeve 31 . The electrode passes through the center of the limiting ring 32 and is inserted into the electrolyte. The top surface of the limiting ring 32 abuts against the bottom surface of the insertion sleeve 16 , and the upper edge of the exhaust pipe 33 is flush with the bottom surface of the limiting ring 32 .

[0049] The collecting sleeve 31 and the limiting ring 32 are integrally formed of glass material, which makes it easy to observe the experimental status.

[0050] The optical detection device 17 is located directly below the experimental electrode 25 and the reference electrode 26 .

[0051] The limiting ring 32 abuts against the insert sleeve 16 to ensure that the height of the lower edge of the exhaust pipe 33 is uniform.

[0052] The air extraction component includes a solenoid valve 34 , one end of which is connected to the top of the exhaust pipe 33 , and the other end is connected to the air extraction pump 35 . The solenoid valve 34 is used to control the on / off of the exhaust pipe 33 .

[0053] When the vacuum pump 35 is working, it can discharge the air in the collecting sleeve 31 outside the experimental electrode 25, thereby raising the liquid level in the collecting sleeve 31. By closing the exhaust pipe 33 using the solenoid valve 34, the collecting sleeve 31 can be ensured to be in a sealed state. At this time, the liquid level in the collecting sleeve 31 remains unchanged under the action of atmospheric pressure.

[0054] During the reaction, the oxygen generated on the surface of the experimental electrode 25 will float up and gather on the top surface of the collecting sleeve 31, thereby causing the liquid level in the collecting sleeve 31 to drop. At this time, all the liquid collected in the collecting sleeve 31 is oxygen.

[0055] A first liquid level sensor 36 and a second liquid level sensor 37 are provided on the side of the collecting sleeve 31 outside the experimental electrode 25 . The first liquid level sensor 36 and the second liquid level sensor 37 are used to detect the liquid level height in the collecting sleeve 31 .

[0056] The first liquid level sensor 36 is flush with the exhaust pipe 33 , and the second liquid level sensor 37 is lower than the first liquid level sensor 36 .

[0057] After the air pump 35 evacuates the air from the collection sleeve 31 outside the experimental electrode 25, the liquid level rises to the level of the first liquid level sensor 36. At this point, both the first liquid level sensor 36 and the second liquid level sensor 37 generate signals. As the reaction occurs, the liquid level in the collection sleeve 31 drops, and the signal from the first liquid level sensor 36 disappears. When the liquid level drops below the level of the second liquid level sensor 37, the signal from the second liquid level sensor 37 also disappears.

[0058] When the signal from the second liquid level sensor 37 outside the experimental electrode 25 disappears, the reaction stops.

[0059] Since the distance between first liquid level sensor 36 and second liquid level sensor 37 is fixed, the volume of collection sleeve 31 between first liquid level sensor 36 and second liquid level sensor 37 is also fixed, and the volume of oxygen obtained when the reaction stops is also fixed. This facilitates calculation of the oxygen evolution reaction current of experimental electrode 25 according to Faraday's law.

[0060] When the operator of this embodiment uses the device, he injects electrolyte into the reaction box 11 through the liquid inlet 14 to ensure that the electrolyte level is flush with the liquid inlet 14 .

[0061] The hydrogen evolution electrode 24 , the experimental electrode 25 and the reference electrode 26 are fixedly mounted on the three electrical posts 22 using locking screws 23 .

[0062] The hydrogen evolution electrode 24 , the experimental electrode 25 and the reference electrode 26 are inserted from the insertion sleeve 16 , ensuring that the insulating sleeve 21 and the insertion sleeve 16 remain sealed.

[0063] The exhaust pipe 33 is opened by the solenoid valve 34, which controls the operation of the air extraction pump 35 to exhaust the air in the collection sleeve 31 outside the experimental electrode 25. When the first liquid level sensor 36 generates a signal, the air extraction pump 35 is stopped, and the exhaust pipe 33 is closed by the solenoid valve 34. At this time, both the first liquid level sensor 36 and the second liquid level sensor 37 generate signals.

[0064] The connecting post 22 connected to the hydrogen evolution electrode 24 is connected to the negative pole, the connecting post 22 connected to the experimental electrode 25 is connected to the positive pole, and the connecting post 22 connected to the experimental electrode 25 and the hydrogen evolution electrode 24 is connected to the potential scanning device 27 through a wire.

[0065] The experiment begins after power is turned on.

[0066] The optical detection device 17 will detect the number of bubbles outside the experimental electrode 25 in real time to determine whether the reaction has started. When the optical detection device 17 detects the generation of bubbles, the potential at this time is the starting potential.

[0067] The potential scanning device 27 performs potential scanning on the experimental electrode 25 and the hydrogen evolution electrode 24 to cause hydrogen and oxygen evolution reactions to occur at the electrodes, thereby obtaining the reaction overpotentials of the two.

[0068] Oxygen generated on the surface of the experimental electrode 25 rises and collects on the top surface of the collection sleeve 31, causing the liquid level in the collection sleeve 31 to drop. At this time, the signal from the first liquid level sensor 36 disappears. When the liquid level drops below the second liquid level sensor 37, the signal from the second liquid level sensor 37 also disappears.

[0069] When the signal from the second liquid level sensor 37 outside the experimental electrode 25 disappears, the reaction stops.

[0070] Since the distance between the first liquid level sensor 36 and the second liquid level sensor 37 is fixed, the volume of the collecting sleeve 31 between the first liquid level sensor 36 and the second liquid level sensor 37 is also fixed, and the volume of oxygen obtained when the reaction stops is also fixed, which facilitates the calculation of the oxygen evolution reaction current of the experimental electrode 25.

[0071] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An oxygen evolution reaction experimental device, characterized in that: include: A reaction device (1), comprising a reaction box (11), the reaction box (11) being used to contain electrolyte, a plurality of optical detection devices (17) being provided at the bottom of the reaction box (11), the optical detection devices (17) being used to detect the generation of reaction bubbles, a top cover (15) being provided at the top of the reaction box (11), a plurality of insertion sleeves (16) being provided on the top cover (15), an electrode assembly (2) being provided in the middle of the insertion sleeves (16), and a gas collection device (3) being provided on the outer side of the bottom of the insertion sleeves (16); There are three groups of electrode assemblies (2), each group of electrode assemblies (2) includes a power connection assembly, the power connection assembly is slidably installed in the insertion sleeve (16), and an electrode is provided at the bottom of the power connection assembly. When the electrode is energized, it can electrolyze the electrolyte to produce hydrogen and oxygen; The gas collecting device (3) comprises a collecting sleeve (31), the top of the collecting sleeve (31) being threadedly connected to the bottom of the inserting sleeve (16), an exhaust pipe (33) being provided at the top of the side of the collecting sleeve (31) and below the inserting sleeve (16), the exhaust pipe (33) passing through the top cover (15) upwards and being connected to an exhaust assembly, the exhaust assembly being used to drain the air in the collecting sleeve (31).

2. An oxygen evolution reaction experimental device according to claim 1, characterized in that: A liquid discharge port (13) and a liquid inlet (14) are symmetrically provided on the side of the reaction box (11), and the liquid inlet (14) is higher than the liquid discharge port (13).

3. An oxygen evolution reaction experimental device according to claim 1, characterized in that: The power connection assembly comprises an insulating sleeve (21), the insulating sleeve (21) is slidably connected to the insertion sleeve (16), and a power connection post (22) is provided through the center of the insulating sleeve (21), and the power connection post (22) is used to connect a power source.

4. An oxygen evolution reaction experimental device according to claim 3, characterized in that: The electrodes include a hydrogen evolution electrode (24), an experimental electrode (25) and a reference electrode (26); the electrodes are fixedly mounted on the bottom of a connection post (22) via a locking screw (23); and a potential scanning device (27) is connected between the experimental electrode (25) and the connection post (22) above the hydrogen evolution electrode (24).

5. An oxygen evolution reaction experimental device according to claim 4, characterized in that: A limiting ring (32) is provided on the inner top of the collecting sleeve (31), and the electrode passes through the center of the limiting ring (32) and is inserted into the electrolyte. The top surface of the limiting ring (32) abuts against the bottom surface of the insertion sleeve (16), and the upper edge of the exhaust pipe (33) is flush with the bottom surface of the limiting ring (32).

6. An oxygen evolution reaction experimental device according to claim 5, characterized in that: The air extraction component comprises an electromagnetic valve (34), one end of the electromagnetic valve (34) is connected to the top end of the exhaust pipe (33), and the other end is connected to an air extraction pump (35). The electromagnetic valve (34) is used to control the on-off of the exhaust pipe (33).

7. An oxygen evolution reaction experimental device according to claim 5, characterized in that: A first liquid level sensor (36) and a second liquid level sensor (37) are provided on the side of the collecting sleeve (31) outside the experimental electrode (25) and the reference electrode (26). The first liquid level sensor (36) and the second liquid level sensor (37) are used to detect the liquid level height in the collecting sleeve (31).

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