Clamp for water electrolysis test

Abstract

The utility model relates to the technical field of electrolyzed water, and discloses a clamp for an electrolyzed water test, which comprises a clamping plate, two guide plates, a buffer wire mesh covered on the surfaces of the guide plates, a cathode electrode, an anode electrode and an ion transmission separator arranged between the cathode electrode and the anode electrode, through bolt holes are formed in the surfaces of the clamping plates, the two guide plates are arranged on the inner sides of the two clamping plates correspondingly, and the two guide plates are embedded into the grooves in the surfaces of the corresponding clamping plates correspondingly. The buffer silk screens and the guide plate form conductive contact; the cathode electrode and the anode electrode are respectively attached to the inner side surfaces of the two buffer silk screens; the ion transmission separator is configured to completely cover the cathode electrode and the anode electrode; the clamping plate, the guide plate, the buffer wire mesh, the cathode electrode, the anode electrode and the ion transmission separator are fastened through bolts to form a laminated sealing structure. The clamp can stably work in a high-temperature and strong-corrosion environment, the electrolytic reaction efficiency and the test result accuracy are improved, meanwhile, the repeated service life of the clamp is prolonged, and the experiment cost is reduced.

Description

Fixture for water electrolysis test Technical Field

[0001] This utility model relates to the field of water electrolysis technology, specifically to a fixture for testing water electrolysis. Background Technology

[0002] Hydrogen energy boasts advantages such as high energy density and zero emissions after combustion, making it considered one of the most promising clean energy sources for the 21st century. Hydrogen production equipment via water electrolysis is simple to operate, uses readily available raw materials, operates under mild conditions, and offers high safety. Currently, hydrogen produced through water electrolysis can be used in various fields, including transportation, power and heat supply, and industrial production.

[0003] Electrolysis of water to produce hydrogen is an electrochemical reaction in which water is passed through the anode and cathode, and the water dissociates into oxygen and hydrogen under the action of electrical energy and a catalyst. Electrolysis of water to produce hydrogen includes reactions at both the anode and cathode: the hydrogen evolution reaction at the cathode and the oxygen evolution reaction at the anode.

[0004] In the existing technology, laboratory-grade electrolysis test fixtures mostly adopt rigid pressing structures. Their clamping components are often processed from a single piece of metal plate. They rely on planar pressing to achieve sealing. In high-temperature and strong alkaline environments, material creep can easily lead to a decrease in clamping force, causing electrolyte leakage and resulting in test data drift. Summary of the Invention

[0005] In view of this, the present invention provides a clamp for testing water electrolysis to solve the problem of poor sealing in existing electrolysis test clamps.

[0006] In a first aspect, this utility model provides a fixture for testing water electrolysis, comprising:

[0007] A pair of parallel clamping plates, the surface of which is provided with through bolt holes;

[0008] Two guide plates are respectively disposed on the inner side of the two clamping plates, and the two guide plates are respectively embedded in the grooves on the surface of the corresponding clamping plates;

[0009] A buffer mesh covers the surface of the guide plate, and the buffer mesh forms a conductive contact with the guide plate;

[0010] A cathode electrode and an anode electrode, wherein the cathode electrode and the anode electrode are respectively attached to the inner surfaces of the two buffer meshes;

[0011] An ion transport isolator disposed between the cathode electrode and the anode electrode, configured to completely cover the cathode electrode and the anode electrode;

[0012] The clamping plate, the guide plate, the buffer mesh, the cathode electrode, the anode electrode, and the ion transport isolation component are fastened together by bolts to form a stacked and sealed structure.

[0013] During assembly, the guide plates are sequentially embedded into the grooves of the clamping plates, and the physical positioning of the grooves ensures precise alignment between the guide plates and the clamping plates. After the buffer mesh covers the surface of the guide plates, its mesh structure undergoes elastic deformation under the preload of the bolts, thereby filling the microscopic uneven areas between the guide plates and the electrodes and forming a continuous conductive interface. The cathode and anode electrodes are respectively attached to the inner surfaces of the two buffer meshes, and the pressure equalization effect of the buffer meshes ensures that the electrode surfaces bear uniform clamping force. The ion transport isolator completely covers the working area of ​​the two electrodes. During the bolt tightening process, its edges are radially constrained by the sidewalls of the clamping plate grooves, forming an annular sealing band. Finally, the axial clamping force is applied by the bolts penetrating the clamping plates, causing controllable deformation of each component layer. The interference fit between the clamping plate grooves and the guide plates produces a bidirectional sealing effect, the elastic support of the buffer mesh maintains the dynamic contact between the electrodes and the guide plates, and the ion transport isolator remains flat under pressure, thereby constructing a stable electrolysis reaction chamber.

[0014] The aforementioned structure features a stacked, sealed structure that is detachably connected via bolt fastening, facilitating rapid assembly and disassembly and enhancing operational convenience. The embedded fit between the guide plate and the clamping plate grooves strengthens the overall structural stability and sealing of the fixture, effectively preventing electrolyte leakage. The buffer mesh not only serves as a support carrier for the electrodes but also optimizes current distribution through its conductivity, ensuring uniform current conduction to the electrode surface and reducing resistance loss due to poor contact. The ion transport isolation component has a coverage area larger than the electrode area, effectively avoiding the risk of short circuits caused by direct contact between the anode and cathode, while maintaining charge balance in the electrolytic reaction through selective ion transport. The overall stacked design ensures a tight fit between components, guaranteeing uniform electrolyte distribution within the fixture. Combined with the high-temperature and acid / alkali-resistant material properties, it can operate stably in high-temperature and highly corrosive environments, improving the efficiency of the electrolytic reaction and the accuracy of test results, while extending the fixture's reusable lifespan and reducing experimental costs.

[0015] In one optional embodiment, the clamping plate is 5 mm thick, the groove is 1 mm deep, and the exposed electrode contact surface in the groove area is 2 cm × 2 cm.

[0016] The clamping plate is designed with a thickness of 5mm, with a groove depth of 1mm. The exposed electrode contact surface formed by this groove area has dimensions of 2cm × 2cm. This size design can precisely limit the effective area of ​​the electrolytic reaction, facilitating standardized testing and data comparison. The clamping plate is made of polypropylene (PP), which has excellent acid and alkali corrosion resistance and high temperature resistance. It can maintain structural stability in highly corrosive electrolyte environments (such as high-concentration potassium hydroxide solutions) and high-temperature conditions (such as reaction temperatures of 80℃), avoiding problems such as decreased clamp sealing or component damage caused by material corrosion or thermal deformation. This ensures that the clamp maintains reliable electrolytic reaction conditions during long-term repeated use. At the same time, polypropylene is a low-cost material, further reducing experimental costs.

[0017] In one optional embodiment, the guide plate is 1 mm thick, and its outer edge shape forms an interference fit with the groove on the surface of the clamping plate. The guide plate is adapted to have anti-slip texture on the contact surface that abuts against the groove wall.

[0018] The guide plate is 1mm thick, and its outer edge shape is designed with an interference fit with the groove on the surface of the clamping plate, so that the guide plate can fit tightly against the groove wall after being embedded in the groove. In addition, the anti-slip texture on the contact surface of the guide plate can effectively enhance the mechanical connection strength between the guide plate and the clamping plate, prevent the guide plate from shifting or loosening during the bolt tightening process, and thus improve the stability of the overall structure of the fixture.

[0019] In one optional embodiment, the buffer mesh has a planar dimension of 2.5cm × 2.5cm.

[0020] The buffer mesh is designed with planar dimensions of 2.5cm × 2.5cm, which is larger than the electrode contact surface (2cm × 2cm). It can completely cover the electrode surface and extend to the outer edge of the electrode, forming a stable support base. The buffer mesh is made of nickel mesh. Due to nickel's high conductivity, it significantly improves the overall conductivity of the fixture, reduces impedance loss during current transmission, and ensures uniform current conduction to the cathode and anode electrodes. Simultaneously, the mesh structure of the nickel mesh combines mechanical strength and flexibility, providing reliable support for the electrodes and preventing deformation or displacement due to uneven force during bolt tightening, thus maintaining the relative positional accuracy of the internal components of the fixture. Furthermore, the corrosion resistance of the nickel mesh ensures stable operation in high-temperature acid and alkali electrolyte environments. Together with the clamping plate and guide plate, it forms a complete and highly conductive fixture system, guaranteeing the stability of current conduction and the reliability of the structure during water electrolysis testing.

[0021] In one optional embodiment, both the cathode electrode and the anode electrode are square metal sheets with dimensions of 2.5cm × 2.5cm.

[0022] Both the cathode and anode electrodes are 2.5cm × 2.5cm square metal sheets, perfectly compatible with the 2.5cm × 2.5cm buffer mesh. This ensures the electrodes completely cover the mesh surface and form a tight, conductive contact. The square structure facilitates standardized processing and assembly, and the neat edge design reduces turbulence at the electrode edges, resulting in a more uniform current distribution. The large contact area between the electrodes and the buffer mesh effectively conducts current, while the mesh provides support and stability, preventing poor contact or structural misalignment due to electrode movement. This size design meets the effective area requirements of the electrolysis reaction and matches the dimensions of other fixture components (such as guide plate grooves and ion transport isolators), ensuring the overall sealing and functionality of the stacked structure. It is suitable for various water electrolysis testing scenarios, including alkaline and neutral conditions.

[0023] In one alternative embodiment, the ion transport separator is a diaphragm or anion / cation exchange membrane.

[0024] The ion transport isolator can be selected as a diaphragm or anion / cation exchange membrane, depending on the testing requirements. When a diaphragm is used, its main function is to physically separate the cathode and anode electrodes, preventing direct contact and short circuits, while allowing ions in the electrolyte to pass through to maintain the charge balance of the electrolysis reaction. If anion / cation exchange membrane is used, it has the function of selectively transporting ions; that is, the cation exchange membrane only allows cations to pass through, and the anion exchange membrane only allows anions to pass through. This allows for precise control of ion migration paths while separating the anode and cathode reaction regions, meeting the testing requirements of different electrolysis systems (such as alkaline electrolysis and proton exchange membrane electrolysis). Both types of ion transport isolators have an area larger than the electrode area (e.g., 3cm × 3cm), completely covering the electrode edge to further reduce the risk of short circuits. Their materials are also resistant to acids and alkalis and swelling, ensuring stable operation in high-temperature and highly corrosive environments. Combined with the stacked sealing structure of the fixture, this effectively improves the controllability of the electrolysis reaction and the accuracy of the test results.

[0025] In one alternative embodiment, the ion transport isolator has a size of 3cm × 3cm.

[0026] The ion transport isolation element (septum or anion / cation exchange membrane) is designed with a planar dimension of 3cm × 3cm, which is larger than the electrode (2.5cm × 2.5cm) and the buffer mesh (2.5cm × 2.5cm), and can completely cover the effective reaction area of ​​the electrode.

[0027] In one optional embodiment, the ion transport isolator is provided with a 0.5 mm thick silicone sealing strip around its perimeter.

[0028] The ion transport isolator has a 0.5mm thick silicone sealing strip around its perimeter. This sealing strip fits tightly against the edge of the ion transport isolator and extends to the outer perimeter of the electrode. The silicone material is highly elastic and chemically inert. Under the force of bolt tightening, it can deform to fill the gaps between layers, forming a flexible sealing boundary. This effectively prevents electrolyte leakage from the gaps between the ion transport isolator and the electrode and buffer mesh, improving the overall sealing performance of the fixture.

[0029] In one optional embodiment, the bolt hole is provided with a polytetrafluoroethylene (PTFE) anti-electrolyte corrosion bushing.

[0030] The bolt holes are fitted with polytetrafluoroethylene (PTFE) bushings to prevent electrolyte corrosion. These bushings fit tightly against the inner wall of the bolt holes, forming a complete isolation barrier. PTFE has excellent chemical stability and can withstand strong acids, strong alkalis (such as 6MKOH), and high-temperature environments (-200℃ to 260℃), effectively preventing electrolyte from seeping into the clamping plate along the bolt holes. This avoids corrosion or electrochemical reactions between the metal bolts and the electrolyte, thereby extending the service life of the clamp.

[0031] In one alternative embodiment, the bolt holes are distributed at least at the corners of the clamping plate.

[0032] Bolt holes are provided at the corners of the clamping plate, forming a four-point or multi-point fastening structure. For example, when the clamping plate is square, one bolt hole is provided at each of the four corners. Tightening the bolts diagonally generates a uniform clamping force, causing the clamping plate, guide plate, buffer mesh, electrodes, and ion transport isolation components to form a tightly fitted, stacked structure. This layout design effectively avoids the edge warping problem caused by traditional single-point central fastening, ensuring uniform force on all components inside the fixture, thereby improving overall sealing performance and electrical conductivity stability. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 is a schematic diagram of the structure of a water electrolysis test fixture according to an embodiment of the present invention;

[0035] Figure 2 is a cell voltage-current diagram of a water electrolysis test fixture according to an embodiment of the present invention under alkaline conditions.

[0036] Figure 3 is a linear sweep voltammetric curve of the cathode hydrogen evolution reaction under alkaline conditions using a fixture for testing water electrolysis according to an embodiment of this utility model.

[0037] Figure 4 is a linear sweep voltammetric curve of the anodic oxygen evolution reaction under alkaline conditions using a water electrolysis test fixture according to an embodiment of this utility model.

[0038] Figure 5 is a cell voltage-current diagram of a water electrolysis test fixture according to an embodiment of the present invention under neutral conditions.

[0039] Figure 6 is a linear sweep voltammetric curve of the cathode hydrogen evolution reaction under neutral conditions using a fixture for testing water electrolysis according to an embodiment of this utility model.

[0040] Figure 7 is a linear sweep voltammetric curve of the anodic oxygen evolution reaction under neutral conditions using a fixture for testing water electrolysis according to an embodiment of this utility model.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Plywood;

[0043] 2. Guide plate;

[0044] 3. Buffer mesh;

[0045] 4. Cathode electrode;

[0046] 5. Anode electrode;

[0047] 6. Ion transport isolation components. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, 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, 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.

[0049] Hydrogen energy boasts advantages such as high energy density and zero emissions after combustion, making it considered one of the most promising clean energy sources for the 21st century. Hydrogen production equipment via water electrolysis is simple to operate, uses readily available raw materials, operates under mild conditions, and offers high safety. Currently, hydrogen produced through water electrolysis can be used in various fields, including transportation, power and heat supply, and industrial production.

[0050] Electrolysis of water to produce hydrogen is an electrochemical reaction in which water is passed through the anode and cathode, and the water dissociates into oxygen and hydrogen under the action of electrical energy and a catalyst. Electrolysis of water to produce hydrogen includes reactions at both the anode and cathode: the hydrogen evolution reaction at the cathode and the oxygen evolution reaction at the anode.

[0051] In the existing technology, laboratory-grade electrolysis test fixtures mostly adopt rigid pressing structures. Their clamping components are often processed from a single piece of metal plate. They rely on planar pressing to achieve sealing. In high-temperature and strong alkaline environments, material creep can easily lead to a decrease in clamping force, causing electrolyte leakage and resulting in test data drift.

[0052] The embodiments of this utility model are described below with reference to Figures 1 to 7.

[0053] According to an embodiment of this utility model, a fixture for testing water electrolysis is provided, including a pair of parallel clamping plates 1, two guide plates 2, a buffer mesh 3 covering the surface of the guide plates 2, a cathode electrode 4, an anode electrode 5, and an ion transmission isolator 6 disposed between the cathode electrode 4 and the anode electrode 5; the surface of the clamping plates 1 is provided with through bolt holes, the two guide plates 2 are respectively disposed inside the two clamping plates 1, and the two guide plates 2 are respectively embedded in the grooves on the surface of the corresponding clamping plates 1; the buffer mesh 3 forms a conductive contact with the guide plates 2, and the cathode electrode 4 and the anode electrode 5 are respectively attached to the inner surface of the two buffer meshes 3; the ion transmission isolator 6 is configured to completely cover the cathode electrode 4 and the anode electrode 5; wherein, the clamping plates 1, guide plates 2, buffer mesh 3, cathode electrode 4, anode electrode 5 and ion transmission isolator 6 are fastened with bolts to form a stacked sealed structure.

[0054] In the above embodiments, during assembly, the guide plate 2 is sequentially embedded into the groove of the clamping plate 1, and the physical limitation of the groove ensures the precise alignment of the guide plate 2 and the clamping plate 1. After the buffer mesh 3 covers the surface of the guide plate 2, its mesh structure undergoes elastic deformation under the action of bolt preload, thereby filling the microscopic uneven area between the guide plate 2 and the electrode and forming a continuous conductive interface. The cathode electrode 4 and the anode electrode 5 are respectively attached to the inner surfaces of the two buffer meshes 3, and the pressure equalization effect of the buffer mesh 3 makes the electrode surface bear a uniform clamping force. The ion transmission isolator 6 completely covers the working area of ​​the two electrodes. Finally, the axial clamping force is applied by the bolts penetrating the clamping plate 1, so that each layer of components produces controllable deformation. The interference fit between the groove of the clamping plate 1 and the guide plate 2 produces a bidirectional sealing effect. The elastic support of the buffer mesh 3 maintains the dynamic contact between the electrode and the guide plate 2. The ion transmission isolator 6 remains flat under pressure, thereby constructing a stable electrolysis reaction chamber.

[0055] The aforementioned structure features a stacked, sealed structure that is detachably connected via bolt fastening, facilitating rapid assembly and disassembly and enhancing operational convenience. The embedded fit between the guide plate 2 and the groove of the clamping plate 1 enhances the overall structural stability and sealing of the fixture, effectively preventing electrolyte leakage. The buffer mesh 3 not only serves as a support carrier for the electrodes but also optimizes current distribution through its conductivity, ensuring uniform current conduction to the electrode surface and reducing resistance loss due to poor contact. The ion transport isolator 6 has a coverage area larger than the electrode area, effectively avoiding the risk of short circuits caused by direct contact between the anode and cathode, while maintaining charge balance in the electrolytic reaction through selective ion transport. The overall stacked design ensures a tight fit between the components, guaranteeing uniform electrolyte distribution within the fixture. Combined with the high-temperature and acid / alkali-resistant material properties, it can operate stably in high-temperature and highly corrosive environments, improving the efficiency of the electrolytic reaction and the accuracy of test results, while extending the repeated service life of the fixture and reducing experimental costs.

[0056] In one embodiment, the clamping plate 1 is 5mm thick, the groove depth is 1mm, and the exposed electrode contact surface in the groove area is 2cm × 2cm. Furthermore, the clamping plate 1 is made of polypropylene, which is resistant to acids, alkalis, and high temperatures.

[0057] In the above embodiment, the thickness of clamp 1 is designed to be 5mm, with a groove depth of 1mm. The exposed electrode contact surface formed by this groove area has a size of 2cm × 2cm. This size design can precisely limit the effective area of ​​the electrolytic reaction, facilitating standardized testing and data comparison. Clamp 1 is made of polypropylene (PP), which has excellent acid and alkali corrosion resistance and high temperature resistance. It can maintain structural stability in highly corrosive electrolyte environments (such as high-concentration potassium hydroxide solutions) and high-temperature conditions (such as a reaction temperature of 80°C), avoiding problems such as decreased clamp sealing or component damage caused by material corrosion or thermal deformation. This ensures that the clamp maintains reliable electrolytic reaction conditions during long-term repeated use. At the same time, polypropylene material has a low cost, further reducing experimental costs.

[0058] In one embodiment, the guide plate 2 is 1 mm thick, and its outer edge shape forms an interference fit with the groove on the surface of the clamping plate 1. The contact surface of the guide plate 2 that abuts against the groove wall is provided with anti-slip texture. Furthermore, the guide plate 2 is made of titanium plate, which is resistant to acids and alkalis and has no electrolytic water properties.

[0059] In this embodiment, the thickness of the guide plate 2 is set to 1mm, and its outer edge shape is designed with an interference fit with the groove on the surface of the clamping plate 1, so that the guide plate 2 can be tightly abutted against the groove wall after being embedded in the groove. With the anti-slip texture provided on the contact surface of the guide plate 2, the mechanical connection strength between the guide plate 2 and the clamping plate 1 can be effectively enhanced, preventing the guide plate 2 from shifting or loosening during the bolt tightening process, thereby improving the stability of the overall structure of the fixture.

[0060] The guide plate 2 is made of titanium plate, which has excellent resistance to acid and alkali corrosion and can adapt to highly corrosive electrolyte environments. At the same time, the titanium plate itself has no electrolytic water activity, which avoids the guide plate 2 participating in the electrochemical reaction and interfering with the test results. This ensures that the electrolytic reaction only takes place on the cathode electrode 4 and the anode electrode 5, thus guaranteeing the accuracy and reliability of the test data. Furthermore, the high strength of the titanium plate further ensures the structural durability of the fixture during long-term use.

[0061] In one embodiment, the buffer mesh 3 has a planar dimension of 2.5cm × 2.5cm. The buffer mesh 3 is a nickel mesh, which can improve the overall conductivity of the fixture, provide support, and maintain the integrity of the fixture structure.

[0062] In the above embodiment, the buffer mesh 3 has a planar dimension of 2.5cm × 2.5cm, which can completely cover the electrode surface and extend to the outer edge of the electrode to form a stable support base. The buffer mesh 3 is made of nickel mesh. Due to the high conductivity of nickel, it can significantly improve the overall conductivity of the fixture, reduce impedance loss during current transmission, and make the current evenly conducted to the cathode electrode 4 and the anode electrode 5. At the same time, the mesh structure of nickel mesh has both mechanical strength and flexibility, which can provide reliable support for the electrodes and prevent the electrodes from deforming or displacing due to uneven force during bolt tightening, thereby maintaining the relative positional accuracy of the internal components of the fixture. In addition, the corrosion resistance of nickel mesh can ensure its stable operation in high-temperature acid and alkali electrolyte environments. Together with the clamping plate 1 and the guide plate 2, it forms a complete and highly conductive fixture system, ensuring the stability of current conduction and the reliability of the structure during the water electrolysis test.

[0063] In one embodiment, both the cathode electrode 4 and the anode electrode 5 are square metal sheets with dimensions of 2.5cm × 2.5cm.

[0064] In the above embodiments, both the cathode electrode 4 and the anode electrode 5 are square metal sheets measuring 2.5cm × 2.5cm. This specification is perfectly compatible with the buffer mesh 3 (2.5cm × 2.5cm), ensuring that the electrodes can completely cover the surface of the buffer mesh 3 and form a tight, conductive contact. The square structure facilitates standardized processing and assembly, and the neat edge design reduces the turbulence effect of the electrolyte at the electrode edges, resulting in a more uniform current distribution. Through the large-area contact with the buffer mesh 3, the electrodes can effectively conduct current, while maintaining positional stability with the support of the buffer mesh 3, avoiding poor contact or structural displacement caused by electrode movement. This size design not only meets the effective area requirements of the electrolysis reaction but also matches the size chain of other components of the fixture (such as the groove of the guide plate 2 and the ion transport isolation component 6), ensuring the sealing and functionality of the overall stacked structure, and is suitable for various electrolysis water testing scenarios such as alkaline and neutral conditions.

[0065] In one embodiment, the ion transport separator 6 is a diaphragm or anion / cation exchange membrane.

[0066] In the above embodiments, the ion transport isolator 6 can be selected as a diaphragm or anion / cation exchange membrane according to the testing requirements. When a diaphragm is selected, its main function is to physically separate the cathode electrode 4 and the anode electrode 5, preventing them from directly contacting each other and causing a short circuit, while allowing ions in the electrolyte to pass through to maintain the charge balance of the electrolysis reaction. If anion / cation exchange membrane is used, it has the function of selectively transporting ions, that is, the cation exchange membrane only allows cations to pass through, and the anion exchange membrane only allows anions to pass through. Thus, while separating the anode and cathode reaction areas, it precisely controls the ion migration path to meet the testing requirements of different electrolysis systems (such as alkaline electrolysis and proton exchange membrane electrolysis). The area of ​​both types of ion transport isolators 6 is larger than the electrode area (e.g., 3cm × 3cm), which can completely cover the electrode edge, further reducing the risk of short circuit. Moreover, their materials have acid and alkali resistance and swelling resistance, ensuring stable operation in high-temperature and highly corrosive environments. Combined with the stacked sealing structure of the fixture, it can effectively improve the controllability of the electrolysis reaction and the accuracy of the test results.

[0067] In one embodiment, the diaphragm is an Agfa Zirfon membrane.

[0068] The diaphragm is Agfa's Zirfon membrane, which has excellent chemical stability and ion conduction performance. Its material is an inorganic-organic hybrid material, which can maintain structural integrity in strongly alkaline (such as 6M potassium hydroxide) and high temperature (such as 80℃) environments, avoiding the problems of easy swelling or degradation of traditional organic membranes.

[0069] In one embodiment, the ion transport isolator 6 has a size of 3cm × 3cm.

[0070] In one embodiment, the planar dimensions of the ion transport separator 6 (septum or cation / anion exchange membrane) are designed to be 3cm × 3cm, which is larger than the electrode (2.5cm × 2.5cm) and the buffer mesh 3 (2.5cm × 2.5cm), and can completely cover the effective reaction area of ​​the electrode.

[0071] In one embodiment, the ion transport isolator 6 has a 0.5 mm thick silicone sealing strip around its four edges.

[0072] The ion transport isolator 6 has a 0.5mm thick silicone sealing strip around its perimeter. This sealing strip fits tightly against the edge of the ion transport isolator 6 and extends to the outer perimeter of the electrode. The silicone material has high elasticity and chemical inertness. Under the action of bolt tightening force, it can deform to fill the gaps between layers, forming a flexible sealing boundary. This effectively prevents electrolyte leakage from the gaps between the ion transport isolator 6 and the electrode and buffer mesh 3, improving the overall sealing performance of the fixture.

[0073] In one embodiment, a polytetrafluoroethylene (PTFE) anti-electrolyte corrosion bushing is provided inside the bolt hole.

[0074] The bolt holes are fitted with polytetrafluoroethylene (PTFE) bushings to prevent electrolyte corrosion. These bushings fit tightly against the inner wall of the bolt holes, forming a complete isolation barrier. PTFE has excellent chemical stability and can withstand strong acids, strong alkalis (such as 6MKOH), and high-temperature environments (-200℃ to 260℃). This effectively prevents electrolyte from seeping into the clamp plate 1 along the bolt holes, avoiding corrosion or electrochemical reactions between the metal bolts and the electrolyte, thereby extending the service life of the clamp.

[0075] In one embodiment, bolt holes are distributed at least at the corners of the clamping plate 1.

[0076] Bolt holes are provided at each corner of the clamping plate 1, forming a four-point or multi-point fastening structure. For example, when the clamping plate 1 is square, a bolt hole is provided at each of the four corners. By tightening the bolts diagonally, a uniform clamping force can be generated, so that the clamping plate 1, guide plate 2, buffer wire mesh 3, electrode and ion transmission isolation component 6 form a tightly fitted stacked structure. This layout design can effectively avoid the edge warping problem caused by traditional single-point central fastening, ensure that the internal components of the fixture are subjected to uniform force, thereby improving the overall sealing performance and conductivity stability.

[0077] In one embodiment, the anode and cathode are made of nickel foam and Raney nickel, respectively, and the ion transport isolator 6 is an Agfa Zirfon membrane. The fixture is assembled using the above assembly method. The fixture is then tested in a 6M potassium hydroxide system at 80°C, and the tank voltage-current curve of the fixture is obtained, as shown in Figure 2. Simultaneously, the overpotentials of the anode and cathode can be measured using a multimeter, as shown in Figures 3 and 4.

[0078] In one embodiment, the anode and cathode are made of commercially available platinum-carbon and iridium dioxide, respectively, and the ion transport isolator 6 is a proton exchange membrane. The fixture is assembled using the above assembly method. The fixture is then tested in a deionized water system at 60°C, and the tank voltage-current curve of the fixture is obtained, as shown in Figure 5. Simultaneously, the overpotentials of the anode and cathode can be measured using a multimeter, as shown in Figures 6 and 7.

[0079] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A fixture for testing water electrolysis, characterized in that, include: A pair of parallel clamping plates (1) with through bolt holes on their surfaces; two guide plates (2) respectively disposed inside the two clamping plates (1), and the two guide plates (2) respectively embedded in the grooves on the inner surfaces of the corresponding clamping plates (1); a buffer mesh (3) covering the surface of the guide plates (2), the buffer mesh (3) forming a conductive contact with the guide plates (2); A cathode electrode (4) and an anode electrode (5) are respectively attached to the inner surfaces of the two buffer meshes (3); an ion transport isolation element (6) is disposed between the cathode electrode (4) and the anode electrode (5), which is configured to completely cover the cathode electrode (4) and the anode electrode (5); wherein the clamping plate (1), the guide plate (2), the buffer mesh (3), the cathode electrode (4), the anode electrode (5) and the ion transport isolation element (6) are fastened together by bolts to form a stacked sealed structure.

2. The fixture for testing electrolyzed water according to claim 1, characterized in that, The clamp (1) is 5mm thick, the groove is 1mm deep, and the exposed electrode contact surface in the groove area is 2cm×2cm.

3. The fixture for testing electrolyzed water according to claim 2, characterized in that, The guide plate (2) is 1 mm thick, and its outer edge shape forms an interference fit with the groove on the surface of the clamp plate (1). The guide plate (2) is adapted to have anti-slip texture on the contact surface that abuts against the groove wall.

4. The fixture for testing electrolyzed water according to claim 3, characterized in that, The buffer mesh (3) has a planar dimension of 2.5cm × 2.5cm.

5. The fixture for testing electrolyzed water according to claim 1, characterized in that, Both the cathode electrode (4) and the anode electrode (5) are square metal sheets with a size of 2.5cm × 2.5cm.

6. The fixture for testing electrolyzed water according to claim 1, characterized in that, The ion transport isolation element (6) is a diaphragm or anion-cation exchange membrane.

7. The fixture for testing electrolyzed water according to claim 6, characterized in that, The ion transport isolator (6) has a size of 3cm × 3cm.

8. The fixture for testing electrolyzed water according to claim 6, characterized in that, The ion transport isolator (6) has a 0.5mm thick silicone sealing strip around its four edges.

9. The fixture for testing electrolyzed water according to any one of claims 1-8, characterized in that, The bolt holes are fitted with polytetrafluoroethylene (PTFE) bushings to prevent electrolyte corrosion.

10. The fixture for testing electrolyzed water according to claim 9, characterized in that, The bolt holes are distributed at least at the corners of the clamp plate (1).

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