Novel accelerated aging life testing device for nickel electrode for hydrogen evolution

Abstract

The invention relates to the technical field of electrode performance testing, and discloses a novel hydrogen evolution nickel electrode accelerated aging life testing device which comprises an electrolytic bath fixedly installed on a supporting frame, a sealing cover is installed on the top of the electrolytic bath, an inner cavity of the electrolytic bath is divided into an anode chamber and a cathode chamber through a diaphragm, and an electrode nickel plate is fixedly installed in the cathode chamber. A hydrogen outlet is formed in one side of the electrolytic cell, an exhaust valve is installed on the hydrogen outlet, and an inner communicating assembly is arranged in the exhaust valve. According to the novel nickel electrode accelerated aging life testing device for hydrogen evolution, along with continuous increase of nitrogen in an air inlet groove, the nitrogen enables a pushing piece to move towards the side away from an exhaust valve, the outer surface of an annular air bag tightly abuts against the inner wall of the exhaust valve, and then the nitrogen in the air inlet groove passes through an inner cavity of an air conveying ring and is sprayed out from the end of an air spraying pipe; the inner side of the exhaust valve is rapidly filled with nitrogen, and redundant air and nitrogen flow to the rear side, so that when the exhaust valve is opened, the hydrogen cannot be in contact reaction with the air.

Description

Technical Field

[0001] The invention relates to the technical field of electrode performance testing, and in particular to a novel accelerated aging life testing device for nickel electrodes used for hydrogen evolution. Background Art

[0002] In order to predict the service life of electrodes in actual production in advance, arrange replacement and maintenance plans reasonably, and ensure the stable operation of industrial production, it is urgent to accurately simulate the long-term performance of electrodes under normal use conditions in a short period of time. Currently, we use accelerated aging methods (such as finely controlling key parameters such as electrolyte concentration, temperature, and current density) to accelerate the prediction of electrode life in actual applications.

[0003] In the hydrogen evolution reaction, the generation of hydrogen is a direct and intuitive result of the electrochemical process on the electrode surface. According to Faraday's law, by detecting the amount of hydrogen generated per unit time (related to the hydrogen concentration), the amount of electricity passing through the electrode can be calculated, which in turn reflects the rate of the electrode reaction. When the nickel electrode has good performance, it has a high catalytic activity for the hydrogen evolution reaction, which can cause more hydrogen ions to obtain electrons on the electrode surface to generate hydrogen. At this time, the hydrogen generation rate is faster and the concentration is relatively high. As the nickel electrode ages, the active sites on its surface may decrease, and the catalytic activity decreases, resulting in a slower rate of hydrogen evolution reaction, a decrease in the amount of hydrogen produced, and a decrease in concentration.

[0004] Based on this principle, we can collect some hydrogen from the electrolytic cell to detect its concentration, and then infer the performance of the nickel electrode. The usual operation is to connect the electrolytic cell to the exhaust valve located on its outside, and then open the exhaust valve to obtain a sample. However, this method of collecting hydrogen has obvious defects, that is, the air originally existing in the connection of the electrolytic cell and the inner tube of the exhaust valve cannot be effectively removed, and a slow oxidation reaction may occur between hydrogen and oxygen, so that the measured hydrogen concentration is lower than the actual value, affecting the accurate evaluation of the hydrogen evolution performance and service life of the nickel electrode. Summary of the invention

[0005] Technical issues solved In view of the above-mentioned shortcomings of the prior art, the present invention provides a novel accelerated aging life test device for nickel electrodes for hydrogen evolution, which can effectively solve the problem in the prior art that the air originally existing at the connection of the electrolytic cell and the inner tube of the exhaust valve cannot be effectively removed when collecting hydrogen, and a slow oxidation reaction may occur between hydrogen and oxygen, thereby making the measured hydrogen concentration lower than the actual value, affecting the accurate evaluation of the hydrogen evolution performance and service life of the nickel electrode.

[0006] Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a novel accelerated aging life test device for nickel electrodes for hydrogen evolution, comprising an electrolytic cell fixedly mounted on a support frame, a sealing cover mounted on the top of the electrolytic cell, and an inner cavity of the electrolytic cell divided into an anode chamber and a cathode chamber by a diaphragm, an electrode nickel plate fixedly mounted in the cathode chamber, and characterized in that: a hydrogen outlet is arranged on one side of the electrolytic cell, and an exhaust valve is mounted on the hydrogen outlet, an internal communication component is arranged in the exhaust valve, and a collecting component is arranged on the side of the internal communication component away from the exhaust valve; The internal communication component comprises a mounting tube mounted on the exhaust valve connection end, a gas pump for inputting nitrogen is mounted on the outer wall of the mounting tube, air inlet grooves are symmetrically provided on the inner wall of the mounting tube, any one of the air inlet grooves is connected to the air outlet end of the air pump, a pusher is slidably connected to the inner side of the mounting tube, an insertion ring is fixedly connected to the opening of the mounting tube, an annular airbag is fixedly mounted to the opening of the insertion ring, a gas delivery ring is integrally formed and connected to the inner side of the mounting tube, and a plurality of injection pipes are annularly mounted on the wall of the gas delivery ring; The collecting assembly comprises a connecting block connected to the side of the mounting tube away from the exhaust valve, an inner hole is penetrated through the connecting block, an adjusting piece for adjusting the inner hole is arranged on the connecting block, a collecting tube is connected to the side of the connecting block away from the mounting tube, and a plurality of sampling tubes are detachably mounted on the collecting tube.

[0007] Furthermore, a rubber ring is bonded to the end surface of the opening of the mounting tube, and the outer diameter of the extending ring is smaller than the inner diameter of the exhaust valve connecting end.

[0008] Furthermore, the two air inlet grooves are connected by an annular groove, and the pushing member includes a sliding rod slidably connected in the air inlet groove, a fixing rod is connected between the tail ends of the two sliding rods, a moving rod is fixedly installed on the outer wall of the fixing rod, and a reset member is connected between the sliding rod and the inner wall of the mounting tube.

[0009] Furthermore, an extrusion block is fixedly mounted on one end of the moving rod close to the annular airbag. The extrusion block is tapered as a whole, and a through groove for gas to pass through is opened on the wall of the extrusion block.

[0010] Furthermore, a cavity is provided in the air delivery ring, the inner cavity of the air delivery ring is connected with the middle section of the air inlet groove, the air outlet end of the air injection pipe faces the inner side of the exhaust valve, and the air outlet end of the air injection pipe is set as a narrow opening.

[0011] Furthermore, the adjusting member includes a blocking rod threadedly mounted on a connecting block, and the diameter of the blocking rod is larger than the diameter of the inner hole. An exhaust rod is rotatably mounted on the connecting block, and the exhaust rod is located between the blocking rod and the mounting tube.

[0012] Furthermore, an L-shaped hole connected to the outside is provided in the exhaust rod, and the L-shaped hole is larger than the diameter of the inner hole, a dust filter cover is fixedly installed on the top of the exhaust rod, and a straight hole is provided in the exhaust rod; The straight hole and the inner hole have the same diameter, the straight hole and the L-shaped hole are arranged vertically and crosswise, and the straight hole and the L-shaped hole are not communicated with each other.

[0013] Furthermore, a one-way valve is installed on the collecting pipe, and a valve cover for sealing the one-way valve is installed on the collecting pipe.

[0014] Furthermore, an external fixing component is provided on the outer side of the mounting tube, and the external fixing component includes a connecting ring fixedly mounted on the outer wall of the mounting tube, a bending rod is welded on the outer wall of the connecting ring, a bidirectional threaded rod is rotatably connected to the inner side of the bending rod, an arc-shaped clamping block is threadedly connected to the bidirectional threaded rod, and there are two arc-shaped clamping blocks symmetrically arranged.

[0015] Furthermore, a knob is fixedly mounted on the top end of the bidirectional threaded rod, and an anti-slip pad is bonded to the inner side of the arc-shaped clamping block.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the end face of the mounting pipe is aligned with the sealing surface of the exhaust valve, and then the air pump is turned on. As the nitrogen in the air inlet groove continuously increases, the nitrogen causes the pusher to move to the side away from the exhaust valve, so that the pusher squeezes the annular airbag, the annular airbag is deformed, and the outer surface of the annular airbag is tightly against the inner wall of the exhaust valve. Subsequently, the nitrogen in the air inlet groove passes through the inner cavity of the air delivery ring and is ejected from the end of the jet pipe, so that the nitrogen quickly fills the inner side of the exhaust valve, and the excess air and nitrogen flow to the rear side for subsequent discharge, so that the hydrogen will not come into contact with the air when the exhaust valve is opened.

[0017] 2. In the present invention, excess air and nitrogen flow toward the inner hole, pass through the inner side of the exhaust rod, and are discharged upward to the outside through the L-shaped hole; a dust filter cover is provided to prevent dust from clogging the L-shaped hole; after a period of time, when the remaining air in the exhaust valve and the mounting tube is completely discharged, the exhaust rod is rotated 90 degrees, and then the blocking rod is rotated with a wrench to move it upward, so that the straight hole is connected with the inner hole, and excess nitrogen in the mounting tube flows into the collecting tube. After the air pressure in the mounting tube and the collecting tube is balanced by the one-way valve, the exhaust valve is opened to allow hydrogen to flow into the collecting tube, and finally the hydrogen enters the sampling tubes for collection.

[0018] 3. The present invention adjusts the knob on the bidirectional threaded rod so that the arc-shaped clamping block tightly clamps the pipe wall of the exhaust valve to ensure a firm connection between the mounting tube and the exhaust valve, thereby fixing the position of the mounting tube and ensuring that the mounting tube does not shake during operation, so that when the outer surface of the annular airbag fits with the inner wall of the exhaust valve, the sealing state will not be affected by the shaking of the mounting tube, and because the spacing between the two arc-shaped clamping blocks is adjustable, it can meet the installation requirements of exhaust valves of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the installation tube according to an embodiment of the present invention; Figure 3 It is a schematic diagram of a partial cross-sectional structure of an embodiment of the present invention; Figure 4 For the embodiment of the present invention Figure 3 A schematic diagram of the structure with a partial enlargement at the center; Figure 5 This is a schematic structural diagram of an extrusion block according to an embodiment of the present invention; Figure 6 A schematic diagram of the structure of an annular airbag according to an embodiment of the present invention; Figure 7 It is a schematic cross-sectional structural diagram of a connecting block according to an embodiment of the present invention; Figure 8 It is a schematic cross-sectional view of the exhaust rod according to an embodiment of the present invention; Fig. 9 It is a schematic structural diagram of an arc-shaped clamping block according to an embodiment of the present invention.

[0021] The numbers in the figure represent: 1. electrolytic cell; 2. electrode nickel plate; 3. exhaust valve; 4. internal connecting component; 41. mounting pipe; 42. air pump; 43. air inlet groove; 44. pushing member; 441. sliding rod; 442. fixing rod; 443. moving rod; 444. resetting member; 445. extrusion block; 45. insertion ring; 46. annular air bag; 47. air delivery ring; 48. jet pipe; 49. rubber ring; 5. collecting component; 51. connecting block; 52. inner hole; 53. adjusting member; 531. blocking rod; 532. exhaust rod; 533. L-shaped hole; 534. dust filter cover; 535. straight hole; 54. collecting tube; 55. sampling tube; 56. one-way valve; 6. external fixing component; 61. connecting ring; 62. bending rod; 63. two-way threaded rod; 64. arc clamping block; 65. knob. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0023] The present invention will be further described below in conjunction with the embodiments.

[0024] Example 1, reference Figure 1 - Figure 6 , which is the first embodiment of the present invention, provides a novel accelerated aging life test device for nickel electrodes for hydrogen evolution, comprising an electrolytic cell 1 fixedly mounted on a support frame, a sealing cover mounted on the top of the electrolytic cell 1, and an inner cavity of the electrolytic cell 1 is divided into an anode chamber and a cathode chamber by a diaphragm, an electrode nickel plate 2 is fixedly mounted in the cathode chamber, a hydrogen outlet is provided on one side of the electrolytic cell 1, and an exhaust valve 3 is welded or fixedly mounted on the hydrogen outlet, and an internal connecting component 4 is installed in the exhaust valve 3.

[0025] The accelerated aging method is used to simulate the long-term performance of the electrode in a short period of time. The aging process of the electrode is accelerated by adjusting the concentration, temperature, current density and other parameters of the electrolyte, thereby accelerating the change in the rate of hydrogen evolution reaction. Accelerated aging causes the electrode performance to change rapidly, and the hydrogen concentration also changes rapidly, so that sufficient data can be obtained in a shorter period of time to evaluate the service life of the electrode. However, if the method of collecting hydrogen leads to measurement errors and cannot accurately reflect the actual changes in hydrogen concentration, it will affect the monitoring of the accelerated aging process. In order to eliminate the interference of air on the measurement of hydrogen concentration, it may be necessary to try different collection methods multiple times or wait longer to observe whether the hydrogen concentration is stable within a reasonable range, which will undoubtedly increase the test time.

[0026] The present invention collects part of the hydrogen from the electrolytic cell 1 to detect its concentration, and then infers the performance of the nickel electrode, connects the electrolytic cell 1 with the exhaust valve 3 located outside the electrolytic cell 1, and then opens the exhaust valve 3 to obtain a sample, and in this process reduces or avoids the interference of air on the measurement of hydrogen concentration.

[0027] The internal connecting component 4 includes a mounting tube 41 mounted on the connecting end of the exhaust valve 3, an air pump 42 for inputting nitrogen is mounted on the outer wall of the mounting tube 41, air inlet grooves 43 are symmetrically provided on the inner wall of the mounting tube 41, any one of the air inlet grooves 43 is connected to the air outlet end of the air pump 42, a pushing member 44 is slidably connected to the inner side of the mounting tube 41, an insertion ring 45 is fixedly connected to the opening of the insertion ring 45, an annular air bag 46 is fixedly mounted to the opening of the insertion ring 45, an air delivery ring 47 is integrally formed and connected to the inner side of the mounting tube 41, and a plurality of injection pipes 48 are mounted in a ring shape on the wall of the air delivery ring 47.

[0028] Specifically, nitrogen can also be replaced by other inert gases (such as argon, helium, etc.). It is necessary to use inert gases to exclude air from the electrolytic cell joints and exhaust valves to avoid slow oxidation reactions between hydrogen and gases in the air, which affects the accuracy of the test, and prevents oxygen and hydrogen from mixing to form an explosive mixture. Nitrogen is the preferred gas for excluding air due to its low cost, easy availability and good effect. It avoids the possible slow oxidation reaction between hydrogen and oxygen, which makes the measured hydrogen concentration lower than the actual value, affecting the accurate evaluation of the hydrogen evolution performance and service life of the nickel electrode.

[0029] Specifically, the end face of the mounting tube 41 is aligned with the sealing face (i.e., the end face) of the exhaust valve 3 so that the two are fitted together. At this time, the extending ring 45 partially extends into the inner side of the exhaust valve 3, and then the air pump 42 is turned on. As the nitrogen gas in the air inlet groove 43 continues to increase, the nitrogen gas causes the pusher 44 to move to the side away from the exhaust valve 3, so that the pusher 44 squeezes the annular airbag 46, and the annular airbag 46 is deformed. The outer surface of the annular airbag 46 is tightly against the inner wall of the exhaust valve 3. Subsequently, the nitrogen gas in the air inlet groove 43 passes through the inner cavity of the air delivery ring 47 and is ejected from the end of the jet pipe 48, so that the nitrogen gas quickly fills the inner side of the exhaust valve 3 (fills the vicinity of the valve ball of the exhaust valve 3). As the nitrogen gas continues to increase, the pressure in the exhaust valve 3 increases, and the excess air and nitrogen gas flow to the rear side for subsequent discharge, so that the hydrogen gas does not come into contact with the air when the exhaust valve 3 is opened.

[0030] Specifically, in the initial state (ie, when nitrogen is not supplied), the outer diameter of the annular airbag 46 is smaller than the inner diameter of the exhaust valve 3 , so that the insertion ring 45 can be inserted into the inner side of the exhaust valve 3 .

[0031] Reference Figure 3 , Figure 4 A rubber ring 49 is bonded to the end surface of the opening of the mounting tube 41 , and the outer diameter of the inserted ring 45 is smaller than the inner diameter of the connecting end of the exhaust valve 3 .

[0032] Specifically, the traditional hydrogen collection and detection method usually uses a quick connector or a pressure-resistant plastic hard tube to directly connect with the exhaust valve 3. As the use time increases, long-term connection and disconnection operations may cause the sealing surface (i.e., the end face) of the exhaust valve 3 to be damaged or indented, thereby reducing the sealing performance and causing leakage at the connection point and air entry.

[0033] Specifically, when installing the mounting tube 41, first put the insertion ring 45 into the inner side of the exhaust valve 3, so that the surface of the rubber ring 49 fits with the sealing surface of the exhaust valve 3 to complete soft contact. Since the rubber ring 49 has moderate hardness and elasticity, it can produce reversible deformation when compressed without causing permanent impact on its restoration to its original state. When the rubber ring 49 is compressed, it always produces elastic force on the sealing surface of the exhaust valve 3.

[0034] Reference Figure 3 The two air inlet grooves 43 are connected by an annular groove, and the pushing member 44 includes a sliding rod 441 slidably connected in the air inlet groove 43, a fixing rod 442 is connected between the tail ends of the two sliding rods 441, a moving rod 443 is fixedly installed on the outer wall of the fixing rod 442, and a reset member 444 is connected between the sliding rod 441 and the inner wall of the mounting tube 41; an extrusion block 445 is fixedly installed on one end of the moving rod 443 close to the annular airbag 46, and the extrusion block 445 is tapered as a whole, and a through groove for gas to pass through is opened on the wall of the extrusion block 445.

[0035] Specifically, after the air delivery pump 42 is turned on, nitrogen continues to increase, pushing the slide rod 441 to move in the air inlet groove 43. Under the connecting action of the fixed rod 442, the two slide rods 441 drive the moving rod 443 to move synchronously, so that the extrusion block 445 contacts the annular airbag 46, and the inclined surface of the extrusion block 445 continuously squeezes the annular airbag 46. In order to keep the internal gas volume of the annular airbag 46 constant, the thickness of the annular airbag 46 is narrowed, and the annular airbag 46 will expand in the diameter direction, and the outer surface of the annular airbag 46 is against the inner wall of the exhaust valve 3.

[0036] Specifically, the reset member 444 can be a compression spring or a spring that can withstand axial pressure, so that the air pump 42 can perform reverse suction when the mounting tube 41 is subsequently removed. Under the elastic action of the reset member 444, the sliding rod 441, the fixed rod 442, the movable rod 443 and the extrusion block 445 are reset to stop extruding the annular airbag 46.

[0037] Reference Figure 3 A cavity is provided in the air delivery ring 47, the inner cavity of the air delivery ring 47 is connected to the middle section of the air inlet groove 43, the air outlet end of the air injection pipe 48 faces the inner side of the exhaust valve 3, and the air outlet end of the air injection pipe 48 is set to a narrow opening.

[0038] Specifically, by designing the gas outlet end as a narrow opening, the speed of nitrogen gas ejected from the gas injection pipe 48 can be increased. According to Bernoulli's principle, the speed of gas will increase when passing through a narrow passage, which helps nitrogen gas to quickly fill the inner space of the exhaust valve 3 and accelerate the discharge of air.

[0039] Example 2, reference Figure 1 - Figure 8 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a collecting component 5 is installed on the side of the internal connecting component 4 away from the exhaust valve 3, and the collecting component 5 includes a connecting block 51 connected to the side of the mounting pipe 41 away from the exhaust valve 3. An inner hole 52 is penetrated in the connecting block 51, and an adjusting member 53 for adjusting the inner hole 52 is provided on the connecting block 51. A collecting pipe 54 is connected to the side of the connecting block 51 away from the mounting pipe 41, and a plurality of sampling pipes 55 are detachably installed on the collecting pipe 54. A one-way valve 56 is installed on the collecting pipe 54, and a valve cover for sealing the one-way valve 56 is installed on the collecting pipe 54.

[0040] Reference Figure 7 , Figure 8The adjusting member 53 includes a blocking rod 531 threadedly mounted on the connecting block 51, and the diameter of the blocking rod 531 is larger than the diameter of the inner hole 52. An exhaust rod 532 is rotatably mounted on the connecting block 51, and the exhaust rod 532 is located between the blocking rod 531 and the mounting tube 41; an L-shaped hole 533 connected to the outside is provided in the exhaust rod 532, and the L-shaped hole 533 is larger than the diameter of the inner hole 52, a dust filter cover 534 is fixedly mounted on the top of the exhaust rod 532, and a straight hole 535 is provided in the exhaust rod 532; the straight hole 535 has the same diameter as the inner hole 52, the straight hole 535 and the L-shaped hole 533 are vertically crossed, and the straight hole 535 and the L-shaped hole 533 are not connected to each other.

[0041] Specifically, excess air and nitrogen flow toward the inner hole 52, pass through the inner side of the exhaust rod 532, and are discharged upward to the outside through the L-shaped hole 533; a dust filter cover 534 is provided to prevent dust from clogging the L-shaped hole 533; after a period of time, when the remaining air in the exhaust valve 3 and the mounting tube 41 is completely exhausted, the exhaust rod 532 is rotated 90 degrees, and then the sealing rod 531 is rotated with a wrench to move it upward, so that the straight hole 535 is connected to the inner hole 52, and excess nitrogen in the mounting tube 41 flows into the collecting tube 54.

[0042] Specifically, the flow direction of the one-way valve 56 is from the collecting pipe 54 to the outside; in order to ensure that no extra nitrogen will accidentally flow into the electrolyzer, after the pressure in the installation pipe 41 and the collecting pipe 54 is balanced by the one-way valve 56, the exhaust valve 3 is opened to allow hydrogen to flow into the collecting pipe 54 (the remaining nitrogen is discharged through the one-way valve 56), and finally the hydrogen enters the sampling pipe 55 for collection. The rest of the structure is the same as that of Example 1.

[0043] Example 3, reference Figure 1 - Fig. 9 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: an external fixing component 6 is installed on the outer side of the mounting tube 41, and the external fixing component 6 includes a connecting ring 61 fixedly installed on the outer wall of the mounting tube 41, a bending rod 62 is welded on the outer wall of the connecting ring 61, and a bidirectional threaded rod 63 is rotatably connected to the inner side of the bending rod 62, and an arc-shaped clamping block 64 is threadedly connected to the bidirectional threaded rod 63, and there are two arc-shaped clamping blocks 64 symmetrically arranged; a knob 65 is fixedly installed on the top of the bidirectional threaded rod 63, and an anti-slip pad is bonded to the inner side of the arc-shaped clamping block 64.

[0044] Specifically, the external fixing component 6 can be a bandage that is wrapped around and fixed. However, if the bandage is not fixed firmly or the material is fatigued, it may still cause the mounting tube 41 to shake, thereby causing gas leakage.

[0045] Specifically, by adjusting the knob 65 on the bidirectional threaded rod 63, the arc-shaped clamping block 64 is tightly clamped on the tube wall of the exhaust valve 3 to ensure a firm connection between the mounting tube 41 and the exhaust valve 3, thereby fixing the position of the mounting tube 41 and ensuring that the mounting tube 41 does not shake during operation, so that when the outer surface of the annular airbag 46 fits against the inner wall of the exhaust valve 3, the sealing state will not be affected by the shaking of the mounting tube 41.

[0046] Specifically, the arc clamp block 64 is threadedly connected by the bidirectional threaded rod 63 to meet the installation requirements of the exhaust valve 3 with different diameters. The anti-skid pad bonded to the inner side of the arc clamp block 64 increases the friction between the exhaust valve 3 and the wall to prevent sliding. The rest of the structure is the same as that of Example 2.

[0047] Based on Examples 1-3, the working principle of the present invention is as follows: The end face of the mounting tube 41 is aligned with the sealing surface (i.e., the end face) of the exhaust valve 3, so that the surface of the rubber ring 49 fits with the sealing surface of the exhaust valve 3 to complete soft contact. At this time, the insertion ring 45 partially extends into the inner side of the exhaust valve 3. According to the actual pipe diameter of the exhaust valve 3, the knob 65 on the two-way threaded rod 63 is rotated so that the two arc-shaped clamping blocks 64 are close to each other and tightly clamp the pipe wall of the exhaust valve 3 to fix the position of the mounting tube 41; then, the air delivery pump 42 is turned on to increase the nitrogen continuously, and the sliding rod 441 is pushed to move in the air inlet groove 43. The two sliding rods 441 drive the moving rod 443 to move synchronously and compress the reset member 444. In this way, the extrusion block 445 contacts the annular airbag 46, and the inclined surface of the extrusion block 445 continuously squeezes the annular airbag 46. In order to keep the internal gas volume of the annular airbag 46 constant, the thickness of the annular airbag 46 is narrowed, and the annular airbag 46 will expand in the diameter direction. The outer surface of the annular airbag 46 is in contact with the exhaust valve 3. The inner walls of the air valve 3 are abutted against each other, completing the connection between the exhaust valve 3 and the mounting tube 41; nitrogen is ejected from the end of the air injection pipe 48, so that the nitrogen quickly fills the inner side of the exhaust valve 3 (filled to the vicinity of the valve ball of the exhaust valve 3), and as the nitrogen continues to increase, the pressure in the exhaust valve 3 increases, and the excess air and nitrogen flow to the inner hole 52, and are discharged upward to the outside through the L-shaped hole 533. After the remaining air in the exhaust valve 3 and the mounting tube 41 is completely exhausted, the exhaust rod 532 is rotated 90 degrees, and the blocking rod 531 is rotated with a wrench to move it upward, so that the straight hole 535 is connected with the inner hole 52, and the excess nitrogen in the mounting tube 41 flows into the collection tube 54 (the remaining nitrogen is discharged through the one-way valve 56), and finally the hydrogen enters the sampling tube 55 for collection. By controlling the concentration, temperature, current density and other parameters of the electrolyte, the measured hydrogen concentration is used to evaluate the hydrogen evolution performance of the nickel electrode, thereby completing the accelerated aging life test of the hydrogen evolution of the nickel electrode.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel accelerated aging life test device for nickel electrodes for hydrogen evolution, comprising an electrolytic cell (1) fixedly mounted on a support frame, a sealing cover mounted on the top of the electrolytic cell (1), and an inner cavity of the electrolytic cell (1) divided into an anode chamber and a cathode chamber by a diaphragm, an electrode nickel plate (2) fixedly mounted in the cathode chamber, characterized in that: A hydrogen outlet is provided on one side of the electrolytic cell (1), and an exhaust valve (3) is installed on the hydrogen outlet; an internal communication component (4) is provided inside the exhaust valve (3); and a collecting component (5) is provided on a side of the internal communication component (4) away from the exhaust valve (3); The internal communication component (4) comprises a mounting tube (41) mounted on the connection end of the exhaust valve (3), a gas delivery pump (42) for inputting nitrogen gas being mounted on the outer wall of the mounting tube (41), gas inlet grooves (43) being symmetrically provided on the inner wall of the mounting tube (41), any one of the gas inlet grooves (43) being connected to the gas outlet end of the gas delivery pump (42), a pusher (44) being slidably connected to the inner side of the mounting tube (41), an insertion ring (45) being fixedly connected to the opening of the mounting tube (41), an annular air bag (46) being fixedly mounted to the opening of the insertion ring (45), a gas delivery ring (47) being integrally formed and connected to the inner side of the mounting tube (41), and a plurality of gas injection pipes (48) being annularly mounted on the wall of the gas delivery ring (47); The collecting assembly (5) comprises a connecting block (51) connected to a side of the mounting tube (41) away from the exhaust valve (3); an inner hole (52) is formed through the connecting block (51); an adjusting member (53) for adjusting the inner hole (52) is provided on the connecting block (51); a side of the connecting block (51) away from the mounting tube (41) is connected to a collecting tube (54); and a plurality of sampling tubes (55) are detachably mounted on the collecting tube (54).

2. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 1 is characterized in that: A rubber ring (49) is bonded to the end surface of the opening of the mounting tube (41), and the outer diameter of the insertion ring (45) is smaller than the inner diameter of the connection end of the exhaust valve (3).

3. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 1 is characterized in that: The two air inlet grooves (43) are connected to each other via an annular groove, the pushing member (44) comprises a sliding rod (441) slidably connected in the air inlet groove (43), a fixing rod (442) is connected between the tail ends of the two sliding rods (441), a moving rod (443) is fixedly mounted on the outer wall of the fixing rod (442), and a reset member (444) is connected between the sliding rod (441) and the inner wall of the mounting tube (41).

4. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 3 is characterized in that: An extrusion block (445) is fixedly mounted on one end of the moving rod (443) close to the annular airbag (46); the extrusion block (445) is tapered as a whole, and a through groove for gas to pass through is provided on the wall of the extrusion block (445).

5. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 1 is characterized in that: A cavity is provided in the gas delivery ring (47), the inner cavity of the gas delivery ring (47) is connected to the middle section of the gas inlet groove (43), the gas outlet end of the gas injection pipe (48) faces the inside of the exhaust valve (3), and the gas outlet end of the gas injection pipe (48) is arranged to be a narrow opening.

6. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 1 is characterized in that: The adjusting member (53) comprises a blocking rod (531) threadedly mounted on the connecting block (51), and the diameter of the blocking rod (531) is greater than the diameter of the inner hole (52). An exhaust rod (532) is rotatably mounted on the connecting block (51), and the exhaust rod (532) is located between the blocking rod (531) and the mounting tube (41).

7. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 6 is characterized in that: An L-shaped hole (533) communicating with the outside is provided in the exhaust rod (532), and the L-shaped hole (533) is larger than the diameter of the inner hole (52); a dust filter cover (534) is fixedly mounted on the top of the exhaust rod (532), and a straight hole (535) is provided in the exhaust rod (532); The straight hole (535) has the same diameter as the inner hole (52); the straight hole (535) and the L-shaped hole (533) are arranged vertically and crosswise; and the straight hole (535) and the L-shaped hole (533) are not connected to each other.

8. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 1 is characterized in that: A one-way valve (56) is installed on the collecting pipe (54), and a valve cover for sealing the one-way valve (56) is installed on the collecting pipe (54).

9. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 1 is characterized in that: An external fixing assembly (6) is arranged on the outer side of the mounting tube (41), and the external fixing assembly (6) comprises a connecting ring (61) fixedly mounted on the outer wall of the mounting tube (41), a bending rod (62) is welded on the outer wall of the connecting ring (61), a bidirectional threaded rod (63) is rotatably connected to the inner side of the bending rod (62), and an arc-shaped clamping block (64) is threadedly connected to the bidirectional threaded rod (63), and two arc-shaped clamping blocks (64) are symmetrically arranged.

10. The novel accelerated aging life test device for nickel electrode for hydrogen evolution according to claim 9, characterized in that: A knob (65) is fixedly mounted on the top end of the bidirectional threaded rod (63), and an anti-slip pad is bonded to the inner side of the arc-shaped clamping block (64).

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