Membrane electrode test fixture for producing hydrogen by electrolyzing water

Abstract

The utility model provides a membrane electrode test fixture for water electrolysis hydrogen production, and relates to the technical field of water electrolysis hydrogen production membrane test. The mounting assembly comprises an end plate, a fixing hole is formed in the end plate, a connecting column is inserted into the fixing hole, the two ends of the outer side of the connecting column are in threaded connection with nuts, and a first positioning block is arranged in the end plate; according to the design, the collector plate and the electrode frame ring can form a standard unit, and multiple units are allowed to be stacked for testing, so that higher flexibility and expandability are provided for parallel testing of multiple electrodes; secondly, by arranging a pressure sensor and a back pressure valve, the pressure resistance of the membrane and whether gas leakage exists between the cathode and the anode can be monitored in real time, so that test errors caused by damage of the membrane electrode are reduced; and the hydrogen permeability per unit time and per unit area can be accurately measured by using a drainage method by arranging a pressure sensor and blocking a feed port, so that the high reliability of a test result is ensured.

Description

Technical Field

[0001] This utility model relates to the field of membrane testing technology for hydrogen production by water electrolysis, and in particular to a membrane electrode testing fixture for hydrogen production by water electrolysis. Background Technology

[0002] Hydrogen energy, as a zero-carbon emission and renewable energy source, is an ideal alternative to fossil fuels. Therefore, using green electricity such as wind power and photovoltaics to electrolyze water to produce hydrogen will be an important part of the future energy system and green development.

[0003] The most crucial aspect of hydrogen production via water electrolysis is the testing fixture or device. Currently, commonly used fixtures or devices are generally square in design, mainly consisting of two end plates, two current collectors, and two flow field plates. The membrane, electrodes, etc., are assembled in the square fixture or device and secured with 8 or 12 bolts and nuts. Due to the need to withstand sufficient locking force, the two flow field plates of this fixture or device are extremely thick, making it difficult to stack them for multi-electrode testing. Furthermore, the insulation of the two flow field plates relies entirely on the membrane or membrane electrode assembly; even slight misalignment during assembly can easily lead to a short circuit. Moreover, currently common devices have relatively limited functionality, lacking any warning or self-checking features. Even minor membrane damage can easily result in erroneous test results, ranging from ineffective work and operator misinterpretation of results to the risk of hydrogen-oxygen leakage and explosion.

[0004] Therefore, this utility model provides a membrane electrode test fixture for hydrogen production by water electrolysis. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a membrane electrode test fixture for hydrogen production by water electrolysis.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a membrane electrode test fixture for hydrogen production by water electrolysis, comprising;

[0007] The mounting assembly includes an end plate, which has a fixing hole inside and a connecting post inserted into the fixing hole. Both ends of the connecting post are threaded with nuts. The end plate has a positioning block inside and an inlet / outlet at each of its four corners.

[0008] Heating assembly; the heating assembly includes a heating hole on one side of an end plate, a heating rod hole on the side of the end plate near the nut, and a temperature measuring hole on the end of the end plate away from the fixing hole;

[0009] The current collection assembly comprises a current collection plate which is fixedly connected to the inner side of the end plate in a symmetrical manner, and the outer side of the current collection plate is fixedly connected with a tab;

[0010] The electrolytic cell pole frame assembly comprises a pole frame ring, and the outer side of the pole frame ring is fixedly connected to the current collection plate through the outer side of the connecting column.

[0011] As a preferred embodiment, the inner side of the current collection plate is provided with a positioning hole two, and the inner side of the current collection plate is provided with an inlet and outlet port two at four corners.

[0012] As a preferred embodiment, the positioning hole two corresponds to the positioning block one on the end plate, and the inlet and outlet port two corresponds to the inlet and outlet port one on the end plate.

[0013] As a preferred embodiment, one end of the pole frame ring is provided with a small circular groove, and the other end of the pole frame ring is provided with a large circular groove.

[0014] As a preferred embodiment, the inner side of the pole frame ring is provided with an inlet and outlet port three at two sides, the inner wall of the pole frame ring is provided with a sealing groove away from the inlet and outlet port three, and the inner side of the pole frame ring is provided with a flow channel at two ends.

[0015] As a preferred embodiment, the inner side of the pole frame ring is provided with a positioning hole three.

[0016] As a preferred embodiment, the positioning hole three corresponds to the positioning block one, and the positioning hole three corresponds to the positioning hole two.

[0017] Compared with the prior art, the advantages and positive effects of the utility model lie in

[0018] The utility model discloses a membrane electrode unit is assembled between the current collection plate and the pole frame ring, wherein the porous transport layer ensures the effective transmission of electrode material, after the current or voltage is applied, the electrolytic water process starts, hydrogen and oxygen are generated, by applying the back pressure test to the cathode side, the pressure resistance of the membrane electrode can be evaluated, and the gas permeation of the membrane is monitored in real time through the pressure sensor, and the performance is further tested, and the back pressure valve and the pressure sensor arranged simultaneously can detect whether hydrogen and oxygen gas mutual leakage occurs to the membrane electrode.

[0019] The design allows multiple unit stacking for testing, which provides higher flexibility and scalability for parallel testing of multiple electrodes.

[0020] Secondly, by configuring the pressure sensor and the back pressure valve, the pressure resistance of the membrane and whether the gas mutual leakage exists between the anode and the cathode can be monitored in real time, so as to reduce the test error caused by the damage of the membrane electrode.

[0021] And by setting the pressure sensor and plugging the feed port, the hydrogen permeability per unit time, per unit area can be accurately measured by the drainage method, ensuring the high reliability of the test results. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A perspective view of a membrane electrode test fixture for hydrogen production by electrolysis of water is provided.

[0023] Figure 2 A mounting assembly structure schematic view of a membrane electrode test fixture for hydrogen production by electrolysis of water is provided.

[0024] Figure 3 A current collecting assembly structure schematic view of a membrane electrode test fixture for hydrogen production by electrolysis of water is provided.

[0025] Figure 4 An electrolytic cell pole frame assembly structure schematic view of a membrane electrode test fixture for hydrogen production by electrolysis of water is provided.

[0026] Figure 5 A pole frame ring structure schematic view of a membrane electrode test fixture for hydrogen production by electrolysis of water is provided.

[0027] Legend:

[0028] 1, mounting assembly; 11, end plate; 12, fixing hole; 13, connecting column; 14, nut; 15, positioning block one; 16, inlet and outlet port one;

[0029] 2, heating assembly; 21, heating hole; 22, heating rod hole; 23, temperature measuring hole;

[0030] 3, current collecting assembly; 31, current collecting plate; 32, pole lug; 33, positioning hole two; 34, inlet and outlet port two;

[0031] 4, electrolytic cell pole frame assembly; 41, pole frame ring; 42, small circular groove; 43, large circular groove; 44, inlet and outlet port three; 45, sealing groove; 46, flow channel; 47, positioning hole three. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] As Figure 1 -Figure 2 The embodiment shown provides a technical solution: a membrane electrode test fixture for hydrogen production by electrolysis of water, comprising;

[0034] The installation assembly 1 comprises an end plate 11, a fixing hole 12 is formed in the inside of the end plate 11, a connecting column 13 is inserted on the fixing hole 12, a nut 14 is threadedly connected to the outer side of both ends of the connecting column 13, a positioning block one 15 is formed in the inside of the end plate 11, and a feeding and discharging port one 16 is formed in the inside of the four corners of the end plate 11;

[0035] The electrolysis water test fixture and device mainly comprise two end plates 11, two current collecting plates 31, one pole frame, and eight pairs of fixed nuts 14. The end plate 11 is a positive end plate 11 and a negative end plate 11, which are provided with a temperature measuring hole 23, a heating hole 21, a fixing hole 12, a positioning block one 15, and a feeding and discharging port one 16. One of the positive end plates 11 is provided with two feeding ports, which are located at the lower position; the negative end plate is provided with two discharging ports, which are located at the upper position; among them, the anode and cathode feeding ports are crossed and corresponded, with the left feeding port corresponding to the right discharging port and the right feeding port corresponding to the left discharging port; the end plate 11 is made of 304, 316, 316L stainless steel, titanium plate, or nickel plate; the positioning block one 15 is used for positioning during assembly of the fixture, which can avoid misalignment during assembly. Specifically, a positioning pin is fixed in the positioning hole on one of the end plates 11, and then the fixture is assembled according to the position of the positioning pin. The fixing hole 12 is fastened with the test fixture by the nut 14, wherein the nut 14 is wrapped with a polytetrafluoroethylene tube or a heat shrink tube to avoid contact with the end plate 11, which may cause short circuit of the positive and negative electrodes. Furthermore, polytetrafluoroethylene or other high-temperature-resistant insulating material gaskets are used before and after the nut 14 to insulate the nut 14 from the two end plates 11. The feeding and discharging port one 16 is sealed with an O-shaped sealing ring made of polytetrafluoroethylene, ethylene propylene diene rubber, or other alkali-resistant corrosion-resistant materials;

[0036] As shown in the heating assembly 2, the heating hole 21 is formed on one side of the end plate 11, the heating rod hole 22 is formed on the side of the end plate 11 close to the nut 14, and the temperature measuring hole 23 is formed on the end of the end plate 11 away from the fixing hole 12; Figure 1 - Figure 2 As shown in the heating assembly 2, the heating hole 21 is formed on one side of the end plate 11, the heating rod hole 22 is formed on the side of the end plate 11 close to the nut 14, and the temperature measuring hole 23 is formed on the end of the end plate 11 away from the fixing hole 12;

[0037] The temperature measuring hole 23 is used to insert a temperature measuring probe to monitor the temperature, and the heating hole 21 is used to insert a heating rod to control the temperature of the test fixture. The heating hole 21 is provided with a hole position for fixing the heating rod to prevent the high-temperature heating rod from falling out of the fixture;

[0038] As shown in the heating assembly 2, the heating hole 21 is formed on one side of the end plate 11, the heating rod hole 22 is formed on the side of the end plate 11 close to the nut 14, and the temperature measuring hole 23 is formed on the end of the end plate 11 away from the fixing hole 12; Figure 1 、 Figure 3 and Figure 4The current collecting assembly 3 is shown. The current collecting assembly 3 comprises a current collecting plate 31 which is symmetrically fixedly connected to the inner side of the end plate 11. The outer side of the current collecting plate 31 is fixedly connected with a tab 32.

[0039] The current collecting plate 31 is a nickel plate or a titanium plate designed in mirror image. The current collecting plate 31 is provided with the tab 32, a positioning hole two 33 and an inlet and outlet port two 34. The tab 32 is provided with a through hole for the access and fixation of an external power supply wire. The positioning hole two 33 is used for assembly positioning and will not be misaligned. The inlet and outlet port two 34 corresponds to the inlet and outlet port one 16 of the end plate 11.

[0040] As shown in Figure 1 , Figure 4 and Figure 5 , the electrolytic cell pole frame assembly 4 is shown. The electrolytic cell pole frame assembly 4 comprises a pole frame ring 41. The outer side of the pole frame ring 41 is fixedly connected to the current collecting plate 31 through the outer side of the connecting column 13. The inner side of the current collecting plate 31 is provided with the positioning hole two 33. The inner side of the current collecting plate 31 is provided with the inlet and outlet port two 34 at four corners. The positioning hole two 33 corresponds to the positioning block one 15 of the end plate 11. The inlet and outlet port two 34 corresponds to the inlet and outlet port one 16 of the end plate 11. One end of the pole frame ring 41 is provided with a small circular groove 42. The other end of the pole frame ring 41 is provided with a large circular groove 43. The inner side of the pole frame ring 41 is provided with the inlet and outlet port three 44 at both sides. The inner wall of the pole frame ring 41 is provided with the sealing groove 45 away from the inlet and outlet port three 44. The inner side of the pole frame ring 41 is provided with the flow channel 46 at both ends. The inner side of the pole frame ring 41 is provided with the positioning hole three 47. The positioning hole three 47 corresponds to the positioning block one 15. The positioning hole three 47 corresponds to the positioning hole two 33.

[0041] The pole frame ring 41 is a polyphenylene sulfide plate or a polyphenylene sulfide plate. The pole frame ring 41 is provided with two circular grooves of different sizes, two sealing grooves 45 on the front and back, four inlet and outlet ports three 44, a flow channel 46 and eight positioning hole threes 47. The small circular groove 42 is used for placing the cathode porous transport layer and the electrode. The large circular groove 43 is used for placing the anode porous transport layer and the electrode. The ion exchange membrane is placed between the cathode electrode and the anode electrode. The sealing groove 45 is used for placing the sealing ring. The sealing ring is made of ethylene propylene diene rubber or polytetrafluoroethylene. The flow channel 46 is used for transporting materials. The positioning hole three 47 corresponds to the positioning hole three 47 of the end plate 11.

[0042] Working principle:

[0043] As shown in Figure 1 - Figure 5 , the working principle is shown.

[0044] In the installation: the specific order is, end plate 11 - current collector plate 31 - pole frame ring 41 - current collector plate 31 - end plate 11; Pole frame ring 41 is specifically porous transport layer - cathode electrode - ion exchange membrane - anode electrode - porous transport layer; Wherein, the porous transport layer is specifically porous nickel felt or titanium felt, the cathode electrode is a cathode catalyst coated on carbon paper, and the anode electrode is an anode catalyst coated on nickel felt; The cathode electrode-ion exchange membrane-anode electrode can also be a membrane electrode formed by coating the cathode and anode catalysts on the ion exchange membrane; The assembled clamp is fastened with bolts, and the fastening force is 3-7 Nm; Then the double-sided feeding can be carried out, and the supply of the anode and cathode materials, the anode and cathode materials are pure water or 1M KOH / NaOH solution of the installation assembly 1; Single-sided feeding can also be used, the anode provides pure water or 1M KOH / NaOH solution of the installation assembly 1, and the cathode is not fed; The pole lug 32 on the current collector plate 31 is connected to the positive and negative poles of the direct current power supply, and the current or voltage is applied, that is, the test evaluation of the related membrane electrode can be carried out; Wherein, the current collector plate 31-pole frame ring 41-current collector plate 31 can be used as a unit, and multiple units can be stacked for testing; When single-sided feeding, the cathode is a dry cathode, a pressure sensor can be arranged at the upper outlet, and a back pressure valve is arranged at the lower outlet, so that the cathode H heating assembly 2 side can be tested. On the one hand, the pressure resistance of the membrane can be evaluated, and on the other hand, whether the cathode and anode exist mutual leakage can be tested online. In addition, the clamp can also be used to test the hydrogen permeability of the ion exchange membrane. By arranging a pressure sensor at the outlet of the positive electrode end plate 11, the negative side is pressurized, then the lower inlet of the negative electrode end plate 11 is blocked, and the drainage method is used to measure the hydrogen permeability of the ion exchange membrane per unit pressure difference per unit time per unit area.

[0045] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments shall fall within the protection scope of the present application.

Claims

1. A membrane electrode test holder for hydrogen production by electrolysis of water, characterized by, Include; The installation assembly (1); the installation assembly (1) includes end plate (11), the inside of end plate (11) is provided with fixed hole (12), the fixed hole (12) is inserted with connecting column (13), the outer side both ends of connecting column (13) are threadedly connected with nut (14), the inside of end plate (11) is provided with locating block one (15), the inside four corners of end plate (11) are provided with inlet and outlet one (16); The heating assembly (2); the heating assembly (2) includes heating hole (21) on the side of end plate (11), heating rod hole (22) is set up on the side of end plate (11) close to nut (14), temperature measuring hole (23) is set up on the end of end plate (11) away from fixed hole (12); The current collecting assembly (3); the current collecting assembly (3) includes current collecting plate (31), the current collecting plate (31) is fixedly connected on the inner side of end plate (11) in symmetry, the outer side of current collecting plate (31) is fixedly connected with tab (32); The electrolytic cell pole frame assembly (4); the electrolytic cell pole frame assembly (4) includes pole frame ring (41), the outer side of pole frame ring (41) is fixedly connected on current collecting plate (31) through the outer side of connecting column (13) is engaged.

2. The membrane electrode test fixture for hydrogen production by water electrolysis according to claim 1, characterized by: The inside of current collecting plate (31) is provided with locating hole two (33), the inside four corners of current collecting plate (31) are provided with inlet and outlet two (34).

3. The membrane electrode test fixture for hydrogen production by water electrolysis according to claim 2, characterized by: The locating hole two (33) corresponds with the locating block one (15) on the end plate (11), the inlet and outlet two (34) correspond with the inlet and outlet one (16) on the end plate (11).

4. The membrane electrode test fixture for hydrogen production by water electrolysis according to claim 1, characterized by: One end of the pole frame ring (41) is provided with a small circular groove (42), the other end of the pole frame ring (41) is provided with a large circular groove (43).

5. The membrane electrode test fixture for hydrogen production by water electrolysis according to claim 1, characterized by: The inside of the pole frame ring (41) is provided with inlet and outlet three (44) on both sides, the inner wall of the pole frame ring (41) is provided with sealing groove (45) away from inlet and outlet three (44) on one side, the inside of the pole frame ring (41) is provided with flow channel (46) on both ends.

6. The membrane electrode test fixture for hydrogen production by water electrolysis according to claim 2, characterized by: The inside of the pole frame ring (41) is provided with locating hole three (47).

7. The membrane electrode test fixture for hydrogen production by water electrolysis according to claim 6, characterized by: The locating hole three (47) corresponds with the locating block one (15), the locating hole three (47) corresponds with the locating hole two (33).

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