Hydrogen elimination layer life test platform and test method

Abstract

This application discloses a hydrogen elimination layer lifetime testing platform and method. The hydrogen elimination layer lifetime testing platform includes: a reaction vessel having an airflow channel and a waterflow channel, the reaction vessel being used to install a hydrogen elimination layer separating the airflow channel and the waterflow channel; a gas source device connected to the airflow channel, the gas source device being used to supply a hydrogen-oxygen mixture to the airflow channel; and a detection device connected to the airflow channel, the detection device being used to detect the hydrogen content in the gas flowing through the hydrogen elimination layer. This hydrogen elimination layer lifetime testing platform can construct accelerated aging conditions, directly enhance the degradation driving conditions of the hydrogen elimination layer, shorten the testing cycle, and improve R&D efficiency; at the same time, it adopts an independent testing system, directly conducting specialized tests on the core functions of the hydrogen elimination layer in a liquid water environment, eliminating interference factors, and making the lifetime assessment results more reliable.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology through water electrolysis, specifically to a hydrogen elimination layer lifetime testing platform and testing method. Background Technology

[0002] In the long-term safe application of proton exchange membrane (PEM) water electrolysis for hydrogen production, the hydrogen removal layer, as a core functional component, plays a crucial role in suppressing the risk of hydrogen permeation and ensuring the safe and stable operation of the electrolyzer. The long-term service life of the hydrogen removal layer directly affects the efficiency and stability of the entire system.

[0003] During PEM water electrolysis, hydrogen generated at the cathode can permeate through the proton exchange membrane to the anode side. If the permeated hydrogen mixes with oxygen generated at the anode and reaches the explosive limit, it can cause serious safety hazards. Furthermore, hydrogen permeation can reduce the anode catalyst layer, thereby reducing the overall efficiency of the electrolyzer. The hydrogen removal layer effectively eliminates permeated hydrogen through the catalytic oxidation of hydrogen and oxygen; maintaining its long-term catalytic activity is crucial for the stable operation of the PEM electrolyzer.

[0004] However, the lifetime assessment of the hydrogen removal layer remains one of the bottlenecks restricting the development of this technology. Traditional lifetime testing relies on the long-term operation of the PEM electrolyzer, characterizing the performance degradation of the hydrogen removal layer by monitoring changes in the hydrogen concentration in the oxygen on the anode side. However, due to the extremely low hydrogen permeation flux during PEM water electrolysis and the slow degradation rate of the hydrogen removal layer material, conventional tests often require thousands of hours to observe significant performance degradation. In addition, during long-term operation of the electrolyzer, side reactions such as the swelling and aging of the proton exchange membrane, the agglomeration and shedding of electrode catalyst particles, and the corrosion of bipolar plates may couple with the degradation process of the hydrogen removal layer, thus interfering with the accuracy of the test results and making it difficult to accurately distinguish the lifetime degradation pattern of the hydrogen removal layer itself. Summary of the Invention

[0005] This application provides a hydrogen depletion layer lifetime testing platform and testing method, aiming to solve at least some of the above-mentioned technical problems.

[0006] This application provides a hydrogen elimination layer lifetime testing platform, including: A reaction vessel having an airflow channel and a waterflow channel, the reaction vessel being used to install a hydrogen removal layer separating the airflow channel and the waterflow channel; A gas source device, connected to the gas flow channel, is used to supply a hydrogen-oxygen mixture to the gas flow channel; and A detection device, connected to the airflow channel, is used to detect the hydrogen content in the gas flowing through the hydrogen elimination layer.

[0007] Optionally, in some embodiments of this application, the hydrogen depletion layer lifetime testing platform further includes a pressure reducing valve, and the gas source device is connected to the gas flow channel through the pressure reducing valve.

[0008] Optionally, in some embodiments of this application, the hydrogen removal layer lifetime testing platform further includes a back pressure valve, which is connected to the airflow channel and used to regulate the air pressure in the airflow channel.

[0009] Optionally, in some embodiments of this application, the hydrogen removal layer lifetime testing platform further includes a drying device, and the detection device is connected to the gas flow channel through the drying device. The drying device is used to dry the gas coming out of the gas flow channel.

[0010] Optionally, in some embodiments of this application, the hydrogen removal layer lifetime testing platform further includes a water supply device, which is connected to the water flow channel and used to supply water to the water flow channel.

[0011] Optionally, in some embodiments of this application, the water supply device includes a water storage tank, a first fluid pipe, and a heater. The water storage tank is used to store water and is connected to the water flow channel through the first fluid pipe. The heater is disposed in the water storage tank and is used to heat the water in the water storage tank.

[0012] Optionally, in some embodiments of this application, the hydrogen depletion layer lifetime testing platform further includes a first pipe and a second pipe, the first pipe connecting the gas source device and the gas flow channel, and the second pipe connecting the detection device and the gas flow channel; the hydrogen depletion layer lifetime testing platform further includes a flow management device, the flow management device including an electrically connected control unit, a flow detection unit, and a flow control unit, the flow detection unit being disposed on one of the first pipe and the second pipe to detect the gas flow rate in the pipe, the flow control unit being disposed on one of the first pipe and the second pipe to control the gas flow rate in the pipe, and the control unit being used to control the operation of the flow control unit based on the detection result of the flow detection unit.

[0013] Optionally, in some embodiments of this application, the detection device includes a gas chromatograph.

[0014] In addition, this application also provides a method for testing the lifetime of a hydrogen-free layer, including: Provide the aforementioned hydrogen removal layer lifetime testing platform; A hydrogen removal layer is provided on the reaction vessel, the hydrogen removal layer separating the gas flow channel and the water flow channel; The gas source device is turned on to supply a hydrogen-oxygen mixture to the gas flow channel, wherein the hydrogen content in the hydrogen-oxygen mixture is φ. in ; Water is supplied to the water flow channel so that the hydrogen removal layer is wetted by water; The detection device is activated to detect the hydrogen content φ in the gas flowing through the hydrogen removal layer. out ; Calculate from the moment the gas source device is turned on to φ out equal to φ in The duration of time, which is the lifetime of the hydrogen elimination layer.

[0015] Optionally, in some embodiments of this application, the detection device intermittently detects the hydrogen content φ in the gas flowing through the hydrogen elimination layer at a first interval. out ; and / or, the hydrogen removal layer lifetime test method further includes: calculating the hydrogen removal efficiency η, wherein the formula for calculating the hydrogen removal efficiency η is as follows: η=1-(φ out / φ in ).

[0016] Optionally, in some embodiments of this application, when the hydrogen depletion layer life test platform further includes a back pressure valve, the back pressure valve is adjusted to increase the air pressure in the airflow channel; and / or, when the hydrogen depletion layer life test platform further includes a water supply device, the water supply device is activated to supply hot water to the water flow channel.

[0017] Optionally, in some embodiments of this application, the hydrogen removal layer is a proton exchange membrane with hydrogen removal function, and the proton exchange membrane with hydrogen removal function contains a mixture of catalyst and ionomer, wherein the catalyst is used to catalyze the reaction of hydrogen and oxygen to produce water.

[0018] The hydrogen removal layer lifetime testing platform provided in this application embodiment, implemented in a liquid water environment, can not only simulate the working environment of PEM electrolyzer water electrolysis, but also actively adjust key parameters such as hydrogen supply concentration when the gas source device supplies hydrogen-oxygen mixture to the gas flow channel, constructing accelerated aging conditions, directly enhancing the degradation driving conditions of the hydrogen removal layer, without waiting for the slow hydrogen production and permeation process of the PEM electrolyzer, shortening the testing cycle and improving R&D efficiency.

[0019] In addition, the hydrogen elimination layer life test platform adopts an independent test system, which directly conducts special tests on the core functions of the hydrogen elimination layer in a liquid water environment. It can effectively isolate the interference of other components in the PEM electrolyzer, focus on the hydrogen catalytic elimination efficiency, and more accurately capture the aging and degradation process of the hydrogen elimination layer itself. It can eliminate interference factors, improve the accuracy of life assessment, and make the life assessment results more reliable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the hydrogen removal layer lifetime testing platform provided in an exemplary embodiment of this application; Figure 2 These are the hydrogen removal layer lifetime test results of Example 1 provided by the exemplary embodiments of this application and the test results of the blank sample provided in Comparative Example 1.

[0021] Explanation of reference numerals in the attached figures: 10. Hydrogen removal layer lifetime test platform; 1. Reaction vessel; 11. Gas flow channel; 12. Water flow channel; 2. Gas source device; 3. Detection device; 4. Pressure reducing valve; 5. Back pressure valve; 6. Drying device; 7. Water supply device; 81. Flow detection unit; 82. Flow control unit; 9. Hydrogen removal layer; 101. Porous transport layer. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] This application provides a hydrogen removal layer lifetime testing platform and testing method. Detailed descriptions follow. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative and do not impose numerical requirements or establish an order. Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any referenced number (fraction or integer) within the indicated range.

[0024] Currently, the hydrogen removal layer lifetime test mainly adopts the in-situ testing method of PEM electrolyzer. This method uses a complete PEM electrolyzer as the core device, with a hydrogen removal layer added to the membrane electrode. During the test, hydrogen gas is generated by electrolyzing water at the cathode of the electrolyzer. Some of the hydrogen gas permeates through the membrane to the anode side. The hydrogen removal layer catalyzes the reaction between the hydrogen gas and oxygen on the anode side. The change in hydrogen concentration in the anode outlet gas is continuously monitored by gas chromatography or sensors. When the hydrogen concentration in the oxygen rises to a preset threshold, the hydrogen removal layer is determined to have failed.

[0025] Existing technologies require excessively long lifespan testing times because the hydrogen permeation rate is determined by the performance of the electrolyzer itself. Continuous monitoring for thousands of hours is needed to obtain statistically significant lifespan data. This not only consumes a lot of time and manpower but also makes it difficult to meet the needs of rapid iteration and optimization of new hydrogen removal layer materials.

[0026] The in-situ operation system of the electrolyzer involves the synergistic effect of multiple components. Factors other than hydrogen removal layer, such as catalyst dissolution and membrane aging, can easily interfere with the test results, making it difficult to achieve accurate analysis of a single variable.

[0027] Long-term operation of electrolytic cells requires a large amount of electrical energy. At the same time, the continuous operation of online monitoring equipment and the maintenance of electrolytic cells will result in high time and economic costs.

[0028] To address this, this application provides a hydrogen elimination layer lifetime testing platform 10, which includes a reaction vessel 1, a gas source device 2, and a detection device 3. The reaction vessel 1 has an airflow channel 11 and a waterflow channel 12, and is used to install a hydrogen elimination layer 9 separating the airflow channel 11 and the waterflow channel 12. The gas source device 2 is connected to the airflow channel 11 and is used to supply a hydrogen-oxygen mixture to the airflow channel 11. The detection device 3 is connected to the airflow channel 11 and is used to detect the hydrogen content in the gas flowing through the hydrogen elimination layer 9.

[0029] The hydrogen removal layer lifetime testing platform 10 is primarily used to test the lifetime of the hydrogen removal layer 9. The hydrogen removal layer 9 refers to the functional structure used to eliminate, adsorb, or convert hydrogen (H2). See the example below. Figure 1The hydrogen removal layer 9 is a proton exchange membrane with hydrogen removal function. This proton exchange membrane with hydrogen removal function is integrally formed from a mixed slurry containing a catalyst and an ionomer. The mixed slurry is coated to form a proton exchange membrane with hydrogen removal function. The entire proton exchange membrane with hydrogen removal function contains a catalyst, which is used to catalyze the reaction of hydrogen and oxygen to produce water. Thus, the proton exchange membrane with hydrogen removal function has both catalytic and proton exchange functions. In another example, the hydrogen removal layer 9 typically includes a catalyst layer and a proton exchange membrane stacked together. The catalyst layer is configured to face the gas flow channel 11, and the proton exchange membrane is configured to face the water flow channel 12. The proton exchange membrane acts as a carrier, and the catalyst layer is attached to the proton exchange membrane. The catalyst layer contains a catalyst, which is used to catalyze the reaction of hydrogen and oxygen to produce water. As an example, the catalyst in the hydrogen removal layer 9 can rapidly catalyze the reaction of hydrogen and oxygen to produce water: 2H2 + O2 → 2H2O. Optionally, the catalyst is a noble metal catalyst, such as platinum (Pt).

[0030] The hydrogen elimination layer lifetime testing platform 10 includes a reaction vessel 1, which can be used to contain other substances. Specifically, the reaction vessel 1 has an airflow channel 11 and a waterflow channel 12. During use, a hydrogen elimination layer 9 is installed on the reaction vessel 1, separating the airflow channel 11 and the waterflow channel 12; that is, the hydrogen elimination layer 9 serves as a common sidewall for both the airflow channel 11 and the waterflow channel 12. As an example, the airflow channel 11 and the waterflow channel 12 are distributed on opposite sides of the hydrogen elimination layer 9, with the hydrogen elimination layer 9 forming the sidewall of the airflow channel 11 and the proton exchange membrane 92 forming the sidewall of the waterflow channel 12. The airflow channel 11 is used to contain the reactants and products during the hydrogen elimination layer lifetime testing process. Taking the catalyst in the hydrogen elimination layer 9 as an example, which can rapidly catalyze the reaction of hydrogen and oxygen to produce water, the reactants include hydrogen and oxygen, and the reaction product includes water; thus, the airflow channel 11 is used to contain hydrogen, oxygen, and water. The waterflow channel 12 is used to contain water. When water enters the water flow channel 12, under the influence of osmotic pressure, the water will wet the entire hydrogen removal layer 9, ensuring that the hydrogen removal layer 9 remains in a moist, absorbing state throughout the test. This design allows the hydrogen removal layer lifetime test platform 10 to simulate the operating environment of a PEM electrolyzer during water electrolysis, thus making the lifetime test results of the hydrogen removal layer 9 more accurate. It should be noted that an external water source can be used to supply water to the water flow channel 12, or a dedicated water source can be installed within the hydrogen removal layer lifetime test platform 10 to supply water to the water flow channel 12.

[0031] As an example, the reaction vessel 1 has a cavity, and a hydrogen removal layer 9 is installed on the reaction vessel 1, dividing the cavity into two parts: a gas flow channel 11 and a water flow channel 12. The reaction vessel 1 also has a first outlet and a first inlet. The first outlet is connected to the gas flow channel 11, and the first inlet is also connected to the gas flow channel 11. Reactants can flow into the gas flow channel 11 through the first inlet, and reaction products and unreacted reactants can flow out of the gas flow channel 11 through the first outlet. The reaction vessel 1 also has a second outlet and a second inlet, which are respectively connected to the water flow channel 12. Water flows into the water flow channel 12 through the second inlet and then flows out through the second outlet.

[0032] The hydrogen removal layer 9 catalyzes the reaction of hydrogen and oxygen to produce water through a thermocatalytic mechanism. Its catalytic performance and service life are significantly dependent on the reaction environment conditions. During the test, liquid water is continuously introduced into one side of the hydrogen removal layer 9, which is similar to a membrane electrode. The water not only flows along the flow channel, but also diffuses and permeates laterally inside and at the interface of the hydrogen removal layer 9, so that the hydrogen removal layer 9 is always in a fully wetted liquid water environment.

[0033] The hydrogen removal layer lifetime testing platform 10 also includes a gas source device 2 for storing reactants, such as a hydrogen-oxygen mixture. As an example, the gas source device 2 includes a gas storage tank. The gas source device 2 is connected to a gas flow channel 11 to supply reactants to the gas flow channel 11. The hydrogen-oxygen mixture refers to a mixture of hydrogen and oxygen. The mixing ratio of hydrogen and oxygen in the hydrogen-oxygen mixture can be selected according to requirements. For example, when it is necessary to accelerate the testing of the hydrogen removal layer lifetime, the hydrogen content in the hydrogen-oxygen mixture can be appropriately increased, and vice versa. Optionally, the hydrogen content in the hydrogen-oxygen mixture is less than or equal to 4 vol%, for example, the hydrogen content in the hydrogen-oxygen mixture is 1 vol%, 2 vol%, 3 vol%, or 4 vol%.

[0034] The hydrogen elimination layer lifetime testing platform 10 also includes a detection device 3, which is also connected to the airflow channel 11 to receive the gas flowing through the hydrogen elimination layer 9 and detect the hydrogen content in the gas. It can be understood that when the gas source device 2 supplies a hydrogen-oxygen mixture to the airflow channel 11, the hydrogen-oxygen mixture undergoes a catalytic reaction to produce water as it passes through the hydrogen elimination layer 9. Thus, the gas flowing through the hydrogen elimination layer 9 mainly consists of water vapor and unreacted hydrogen and oxygen. The detection device 3 then detects the hydrogen content in the gas flowing through the hydrogen elimination layer 9.

[0035] Optionally, the detection device 3 includes a gas chromatograph (GC). A gas chromatograph can directly detect the proportion of hydrogen in all gaseous components. Of course, in other embodiments, electrochemical sensing, infrared spectroscopy, or mass spectrometry can also be used to detect the hydrogen content in the gas. Taking electrochemical sensing as an example, hydrogen is oxidized on a catalytic electrode, and the current is proportional to the hydrogen concentration; by detecting the current, the hydrogen content in the gas can be determined.

[0036] The hydrogen removal layer lifetime testing platform 10 provided in this application embodiment, implemented in a liquid water environment, can not only simulate the working environment of PEM electrolyzer when electrolyzing water, but also actively adjust key parameters such as hydrogen supply concentration when the gas source device 2 supplies hydrogen-oxygen mixture to the airflow channel 11, constructing accelerated aging conditions, directly enhancing the degradation driving conditions of the hydrogen removal layer 9, without waiting for the slow hydrogen production and permeation process of the PEM electrolyzer, shortening the testing cycle, and improving R&D efficiency.

[0037] In addition, the hydrogen elimination layer life test platform 10 adopts an independent test system, which directly conducts special tests on the core functions of the hydrogen elimination layer 9 in a liquid water environment. It can effectively isolate the interference of other components in the PEM electrolyzer, focus on the hydrogen catalytic elimination efficiency, and more accurately capture the aging and degradation process of the hydrogen elimination layer 9 itself, eliminate interference factors, improve the accuracy of life assessment, and make the life assessment results more reliable.

[0038] Furthermore, the hydrogen elimination layer life test platform 10 has low operating energy consumption and does not rely on a complete PEM electrolyzer system, which greatly reduces energy consumption and equipment maintenance costs during the test process, thus lowering the test cost.

[0039] In summary, this application provides an accelerated lifetime testing platform for hydrogen removal layers that can significantly shorten the testing cycle and eliminate interference from non-target factors. By constructing an independent hydrogen permeation and catalytic oxidation system, this platform can control the hydrogen permeation flux, accelerate the aging and degradation process of the hydrogen removal layer 9, and simultaneously avoid the stability interference of catalysts, membranes, and other components during in-situ operation of the PEM electrolyzer. This allows for rapid and accurate evaluation of the long-term operational performance of the hydrogen removal layer 9, providing key technical support for the optimization of high-performance hydrogen removal layer materials.

[0040] For some embodiments of this application, please refer to Figure 1 The hydrogen elimination layer life test platform 10 also includes a pressure reducing valve 4, and the gas source device 2 is connected to the gas flow channel 11 through the pressure reducing valve 4.

[0041] When the hydrogen elimination layer life test platform 10 is in use, the gas source device 2 continuously supplies hydrogen-oxygen mixture into the airflow channel 11. To increase the amount of hydrogen-oxygen mixture stored in the gas source device 2, it is pressurized, causing the gas pressure inside the gas source device 2 to rise. To prevent the hydrogen-oxygen mixture in the gas source device 2 from rushing into the airflow channel 11 under the action of pressure difference, a pressure reducing valve 4 is installed. The high-pressure hydrogen-oxygen mixture flowing out of the gas source device 2 is first reduced to a set low pressure by the pressure reducing valve 4 to maintain pressure stability. On the one hand, this protects the pipelines and equipment in the hydrogen elimination layer life test platform 10, and on the other hand, it increases the residence time of the hydrogen-oxygen mixture in the airflow channel 11 to ensure that the hydrogen-oxygen mixture fully contacts the catalyst in the hydrogen elimination layer 9 and undergoes a catalytic reaction.

[0042] Optionally, the hydrogen removal layer life test platform 10 also includes a first pipe and a second pipe, wherein the first pipe connects the gas source device 2 and the airflow channel 11, and the second pipe connects the detection device 3 and the airflow channel 11. A pressure reducing valve 4 is installed on the first pipe.

[0043] For some embodiments of this application, please refer to Figure 1 The hydrogen elimination layer life test platform 10 also includes a back pressure valve 5, which is connected to the airflow channel 11 and used to regulate the air pressure in the airflow channel 11.

[0044] Along the gas flow path (see...) Figure 1 (As indicated by the arrow in the diagram), the back pressure valve 5 is typically located downstream of the airflow channel 11. For example, the back pressure valve 5 is positioned between the detection device 3 and the reaction vessel 1, with a second pipe connecting the detection device 3 and the airflow channel 11 of the reaction vessel 1. The back pressure valve 5 is located on the second pipe. When the air pressure in the airflow channel 11 is too low, blocking the second pipe with the back pressure valve 5 increases the air pressure in the airflow channel 11; when the air pressure in the airflow channel 11 is too high, opening the back pressure valve 5 allows the gas in the airflow channel 11 to flow out, thus releasing pressure and reducing the air pressure in the airflow channel 11.

[0045] Since the hydrogen-oxygen mixture undergoes a catalytic reaction on the hydrogen-removing layer 9 of the airflow channel 11, and the progress of the catalytic reaction is easily affected by environmental pressure, when the gas pressure inside the airflow channel 11 increases, the catalytic reaction rate accelerates, thereby accelerating the aging rate of the hydrogen-removing layer 9, i.e., accelerating the hydrogen-removing layer life test process. Therefore, by using the back pressure valve 5 to regulate the gas pressure inside the airflow channel 11, the speed of the hydrogen-removing layer life test can be adjusted, making the hydrogen-removing layer life test platform 10 more flexible in use.

[0046] For some embodiments of this application, please refer to Figure 1The hydrogen elimination layer lifetime test platform 10 also includes a drying device 6. The detection device 3 is connected to the airflow channel 11 through the drying device 6. The drying device 6 is used to dry the gas coming out of the airflow channel 11.

[0047] In the gas flow path, the drying device 6 is located downstream of the gas flow channel 11 and upstream of the detection device 3. As an example, the second pipe connects the detection device 3 and the gas flow channel 11 of the reaction vessel 1, and the drying device 6 is disposed on the second pipe.

[0048] The hydrogen-oxygen mixture undergoes a catalytic reaction to produce water in the gas flow channel 11. Water is easily (especially at high temperatures) to flow out with the unreacted hydrogen-oxygen mixture and enter the detection device 3. However, the presence of water may easily cause corrosion to the detection device 3 and may also interfere with the detection results, especially when the detection device 3 is a gas chromatograph.

[0049] By setting up a drying device 6 to dry the gas coming out of the gas flow channel 11, the moisture content in the gas flowing out of the gas flow channel 11 is reduced. On the one hand, this can protect the detection device 3, and on the other hand, it can improve the accuracy of the detection results and speed up the detection process.

[0050] Taking gas chromatography as an example, when the gas flowing out of gas flow channel 11 is dried by drying device 6, the main components of the gas are oxygen and hydrogen. Gas chromatography can quickly determine the hydrogen content by only detecting the amount of oxygen and hydrogen.

[0051] As an example, the drying device 6 includes a cylinder, the two ends of which are connected to the detection device 3 and the airflow channel 11, respectively, and the cylinder is filled with a desiccant.

[0052] For some embodiments of this application, please refer to Figure 1 The hydrogen elimination layer lifetime test platform 10 also includes a water supply device 7, which is connected to the water flow channel 12 and is used to supply water to the water flow channel 12.

[0053] In some embodiments of this application, the water supply device 7 includes a water storage tank and a first fluid pipe. The water storage tank is used to store water and is connected to the water flow channel 12 of the reaction vessel 1 via the first fluid pipe, so that water in the water storage tank can flow into the water flow channel 12 through the first fluid pipe. Optionally, the water supply device 7 also includes a second fluid pipe, which is also connected to the water flow channel 12 and the water storage tank. Water in the water flow channel 12 can flow back to the water storage tank through the second fluid pipe, realizing water circulation. Optionally, the water supply device 7 also includes a water pump, which can be installed on the first fluid pipe or the second fluid pipe. The water pump can propel water in a directional flow, i.e., from the water storage tank to the water flow channel 12 and from the water flow channel 12 back to the water storage tank. Further, the water supply device 7 also includes a heater, which is installed on the water storage tank and is used to heat the water in the water storage tank. The water supply device 7 may also include a controller and a temperature detector. The temperature detector is used to detect the temperature of the water in the water storage tank. Both the heater and the temperature detector are electrically connected to the controller. The controller adjusts the operation of the heater (e.g., start / stop or adjust the heating power) based on the detected water temperature in the water storage tank. By controlling the temperature of the water supplied by the water supply device 7 to the water flow channel 12, the temperature of the hydrogen removal layer 9 on the reaction vessel 1 can be indirectly controlled, simulating actual working conditions and providing a constant temperature environment for the reaction. For example, when the actual operating temperature of water electrolysis is 80°C, setting the temperature of the water supplied by the water supply device 7 to the water flow channel 12 to 80°C can roughly control the temperature of the hydrogen removal layer 9 to 80°C.

[0054] The catalytic reaction of the hydrogen-oxygen mixture on the hydrogen removal layer 9 is also easily affected by the ambient temperature. When the temperature of the hydrogen removal layer 9 increases, the catalytic reaction rate accelerates, thereby accelerating the aging rate of the hydrogen removal layer 9, i.e., speeding up the hydrogen removal layer life test process. Therefore, by using the water supply device 7 to regulate the temperature of the hydrogen removal layer 9, the speed of the hydrogen removal layer life test can be adjusted, making the hydrogen removal layer life test platform 10 more flexible in use.

[0055] For some embodiments of this application, please refer to Figure 1 The hydrogen elimination layer life test platform 10 also includes a first pipe and a second pipe. The first pipe is connected to the gas source device 2 and the air flow channel 11, and the second pipe is connected to the detection device 3 and the air flow channel 11. The hydrogen removal layer lifetime test platform 10 also includes a flow management device, which includes an electrically connected control unit, a flow detection unit 81, and a flow control unit 82. The flow detection unit 81 is installed on one of the first pipe and the second pipe to detect the gas flow rate in the pipe. The flow control unit 82 is installed on one of the first pipe and the second pipe to control the gas flow rate in the pipe. The control unit is used to control the operation of the flow control unit 82 based on the detection result of the flow detection unit 81.

[0056] Optionally, in the flow management device, the flow detection unit 81 is a flow meter, the flow control unit 82 is a needle valve, and the control unit is a microcontroller. The flow meter, needle valve, and microcontroller are independent components. In one example, both the flow meter and the needle valve are installed on the first pipe. The flow meter is used to detect the gas flow rate in the first pipe, and the needle valve is used to control the gas flow rate in the first pipe. In another example, both the flow meter and the needle valve are installed on the second pipe. The flow meter is used to detect the gas flow rate in the second pipe, and the needle valve is used to control the gas flow rate in the second pipe. In yet another example, the flow meter is installed on the first pipe to detect the gas flow rate in the first pipe, and the needle valve is installed on the second pipe to control the gas flow rate in the second pipe. In yet another example, the flow meter is installed on the second pipe to detect the gas flow rate in the second pipe, and the needle valve is installed on the first pipe to control the gas flow rate in the first pipe.

[0057] Optionally, the flow management device is an integrated intelligent mass flow controller (with real-time digital display and closed-loop control). This integrated intelligent mass flow controller integrates the control unit, flow detection unit 81, and flow control unit 82. It can directly set the target hydrogen supply flow rate in oxygen, collect flow data in real time through built-in sensors and feed it back to the control module, automatically adjusting the valve opening to maintain flow stability, thus simplifying system piping connections and operation procedures. In one example, the integrated intelligent mass flow controller is installed on the first pipeline; in another example, it is installed on the second pipeline.

[0058] The flow rate of gas within the hydrogen elimination layer life test platform 10 can be effectively controlled by the flow management device, thereby adjusting the speed of the hydrogen elimination layer life test and making the hydrogen elimination layer life test platform 10 more flexible in use.

[0059] For some embodiments of this application, please refer to Figure 1 The hydrogen removal layer lifetime testing platform 10 also includes a porous transport layer 101, which is disposed on the side of the hydrogen removal layer 9 facing away from the gas flow channel 11. When the hydrogen removal layer 9 is placed on the reaction vessel 1, the proton exchange membrane 92 rests against the porous transport layer 101. The porous transport layer 101 supports the hydrogen removal layer 9 and the proton exchange membrane 92, and ensures normal water flow. As an example, the porous transport layer 101 includes stacked titanium felt and titanium mesh.

[0060] Please see Figure 1 This application also provides a method for testing the lifetime of a hydrogen elimination layer, including: S1. Provide the hydrogen elimination layer lifetime testing platform 10 mentioned above; S2. A hydrogen elimination layer 9 is provided on the reaction vessel 1, which separates the gas flow channel 11 and the water flow channel 12. S3. Turn on the gas source device 2 to supply a hydrogen-oxygen mixture to the gas flow channel 11. The hydrogen content in the hydrogen-oxygen mixture is φ. in ; S4. Supply water to the water flow channel 12 so that the hydrogen removal layer 9 is wetted by water; S5. Activate detection device 3 to detect the hydrogen content φ in the gas flowing through hydrogen elimination layer 9. out ; S6, Calculate the start time of gas source device 2 to φ out equal to φ in The duration of time is the lifetime of hydrogen elimination layer 9.

[0061] The hydrogen removal layer lifetime testing method provided in this application is simple and can directly monitor key indicators such as catalytic activity and stability of the hydrogen removal layer 9 online. It does not require complex electrolyzer system control and multi-parameter synchronous coordination, which reduces the difficulty of operation and the risk of test interruption, and improves the convenience of the test process.

[0062] This hydrogen removal layer lifetime testing method can predict the lifetime of the hydrogen removal layer in a real PEM water electrolysis system. It can obtain the total amount of hydrogen that the hydrogen removal layer 9 will consume until it fails and is eliminated by accelerating the hydrogen removal layer lifetime testing platform 10. The hydrogen consumption of the hydrogen removal layer 9 in the reaction vessel 1 can be obtained based on the operating current and the initial hydrogen concentration in the oxygen. By comparing the total hydrogen consumption over the entire life cycle obtained from the accelerated test with the hydrogen consumption per unit time under actual operating conditions, the working lifetime of the hydrogen removal layer in the real PEM water electrolysis system can be calculated, providing a quantitative basis for the material performance evaluation of the hydrogen removal layer.

[0063] In some embodiments of this application, the detection device 3 intermittently detects the hydrogen content φ in the gas flowing through the hydrogen elimination layer 9 at a first interval. out This setting can save energy consumption of the detection device 3. As an example, the first interval duration is 10 min to 2 h, such as 10 min, 20 min, 30 min, 1 h, 1.5 h or 2 h.

[0064] In some embodiments of this application, the hydrogen removal layer lifetime testing method further includes: calculating the hydrogen removal efficiency η, wherein the formula for calculating the hydrogen removal efficiency η is as follows: η=1-(φ out / φ in ).

[0065] Typically, when the hydrogen content in the hydrogen-oxygen mixture is less than 50 vol%, the catalytic activity of the hydrogen removal layer is at its best initially during the hydrogen removal layer lifetime test. Therefore, φ outThe initial value is low, meaning that most of the hydrogen in the hydrogen-oxygen mixture is consumed through a catalytic reaction. However, as the test progresses and the hydrogen removal layer ages, less and less hydrogen in the hydrogen-oxygen mixture is consumed. out The hydrogen concentration increases until the hydrogen elimination layer completely fails, and none of the hydrogen in the hydrogen-oxygen mixture is consumed, thus φ... out =φ in .

[0066] Therefore, during the hydrogen removal layer lifetime test, the hydrogen removal efficiency η decreases until it becomes 0.

[0067] For some embodiments of this application, please refer to Figure 1 When the hydrogen elimination layer lifetime test platform 10 also includes a back pressure valve 5, the back pressure valve 5 is adjusted to increase the air pressure in the airflow channel 11.

[0068] Optionally, the air pressure in the airflow channel 11 is 2MPa to 4MPa, for example 2MPa, 2.5MPa, 3MPa, 3.5MPa or 4MPa.

[0069] For some embodiments of this application, please refer to Figure 1 When the hydrogen elimination layer life test platform 10 also includes a water supply device 7, the water supply device 7 is activated to supply hot water to the water flow channel 12.

[0070] Optionally, the temperature of the hot water supplied by the water supply device 7 to the water flow channel 12 is 70°C to 90°C, for example, 70°C, 75°C, 80°C, 85°C or 90°C.

[0071] By increasing the air pressure in the airflow channel 11 and / or raising the water temperature in the water flow channel 12, the catalytic reaction in the airflow channel 11 can be accelerated, thereby speeding up the aging of the hydrogen removal layer 9, increasing the speed of hydrogen removal layer life test, and saving time.

[0072] In some embodiments of this application, the hydrogen removal layer lifetime testing method further includes: predicting the working lifetime of the hydrogen removal layer 9 in a real PEM water electrolysis system. Specifically, the total amount of hydrogen eliminated by the hydrogen removal layer 9 until its failure can be obtained through the hydrogen removal layer lifetime testing platform 10. The hydrogen consumption per unit time of the hydrogen removal layer 9 operating in the reaction vessel 1 can be obtained based on the operating current and the initial hydrogen concentration in the oxygen. By comparing the total hydrogen consumption over the entire life cycle obtained from the accelerated test with the hydrogen consumption per unit time under actual operating conditions, the working lifetime of the hydrogen removal layer in a real PEM water electrolysis system can be calculated.

[0073] The following description is based on specific embodiments.

[0074] Example 1 Provide such as Figure 1The hydrogen removal layer lifetime test platform shown includes a reaction vessel as a device, a gas source device as a gas cylinder, a detection device as a gas chromatograph (GC), a drying device as a drying column, and a flow control unit as a needle valve.

[0075] The gas cylinder provides a mixture of 3 MPa and 0.5 vol% H2in O2, which, after passing through a pressure reducing valve, is introduced into an active area of ​​4 cm² containing only a hydrogen-removing layer (platinum-carbon loading of 0.1 mg). 2 Inside the device; at the same time, the flow rate of the mixed gas is adjusted to 10 mL / min through the needle valve, and the back pressure valve maintains the working pressure inside the device at 3 MPa. Circulating water at 80℃ is introduced into the device to simulate the actual working conditions, because the actual operating temperature of water electrolysis is 80℃, and at the same time, to provide a constant temperature environment for the reaction. The mixed gas undergoes a catalytic reaction 2H2 + O2 → 2H2O in the hydrogen removal layer. The generated water is then treated by the subsequent drying column, and the unreacted hydrogen and oxygen are discharged from the device outlet.

[0076] The outlet gas is first dried using a drying column to remove the moisture generated in the reaction (to avoid interference from water in gas chromatography detection). Then, the real-time concentration of hydrogen in oxygen (labeled as M%) is detected by gas chromatography. The hydrogen content in oxygen is tested every ten hours, and the results are as follows: Figure 2 As shown.

[0077] from Figure 2 As can be seen, the hydrogen removal layer lifetime testing platform provided in Example 1 only requires 50 hours of experimental time to obtain complete lifecycle performance data of the hydrogen removal layer from stable operation to functional failure. Integrating the hydrogen concentration curve in oxygen allows calculation of the amount of hydrogen eliminated during operation. This hydrogen removal layer lifetime testing platform can also predict the lifetime of the hydrogen removal layer. The platform can obtain the total amount of hydrogen eliminated by the hydrogen removal layer until failure. Based on the operating current and initial hydrogen concentration in oxygen, the hydrogen consumption per unit time of the hydrogen removal layer operating in the device can be obtained. By comparing the total hydrogen consumption over the entire lifecycle obtained from accelerated testing with the hydrogen consumption per unit time under actual operating conditions, the working lifetime of the hydrogen removal layer in a real PEM water electrolysis system can be calculated.

[0078] Comparative Example 1 The difference from Example 1 is the removal of the hydrogen elimination layer; the GC test results are also available in [link to example]. Figure 2 As can be seen from the figure, the concentration of hydrogen in oxygen remained basically unchanged throughout the entire test.

[0079] The above provides a detailed description of a hydrogen removal layer lifetime testing platform and testing method provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A hydrogen consumption layer lifetime test platform, characterized in that, include: A reaction vessel having an airflow channel and a waterflow channel, the reaction vessel being used to install a hydrogen removal layer separating the airflow channel and the waterflow channel; A gas source device is connected to the gas flow channel, and the gas source device is used to supply a hydrogen-oxygen mixture to the gas flow channel; as well as A detection device, connected to the airflow channel, is used to detect the hydrogen content in the gas flowing through the hydrogen elimination layer.

2. The hydrogen elimination layer lifetime testing platform according to claim 1, characterized in that, The hydrogen elimination layer life test platform also includes a pressure reducing valve, and the gas source device is connected to the gas flow channel through the pressure reducing valve.

3. The hydrogen elimination layer lifetime testing platform according to claim 1, characterized in that, The hydrogen removal layer lifetime testing platform also includes a back pressure valve, which is connected to the airflow channel and used to regulate the air pressure in the airflow channel.

4. The hydrogen elimination layer lifetime testing platform according to claim 1, characterized in that, The hydrogen removal layer lifetime testing platform also includes a drying device. The testing device is connected to the gas flow channel through the drying device, and the drying device is used to dry the gas coming out of the gas flow channel.

5. The hydrogen elimination layer lifetime testing platform according to claim 1, characterized in that, The hydrogen elimination layer lifetime testing platform also includes a water supply device, which is connected to the water flow channel and used to supply water to the water flow channel.

6. The hydrogen elimination layer lifetime testing platform according to claim 5, characterized in that, The water supply device includes a water storage tank, a first fluid pipeline, and a heater. The water storage tank is used to store water and is connected to the water flow channel through the first fluid pipeline. The heater is installed inside the water storage tank and is used to heat the water in the water storage tank.

7. The hydrogen elimination layer lifetime testing platform according to any one of claims 1 to 6, characterized in that, The hydrogen removal layer life test platform also includes a first pipe and a second pipe, the first pipe connecting the gas source device and the airflow channel, and the second pipe connecting the detection device and the airflow channel; The hydrogen removal layer lifetime testing platform also includes a flow management device, which comprises an electrically connected control unit, a flow detection unit, and a flow control unit. The flow detection unit is installed on one of the first pipe and the second pipe to detect the gas flow rate within that pipe. The flow control unit is installed on one of the first pipe and the second pipe to control the gas flow rate within that pipe. The control unit is used to control the operation of the flow control unit based on the detection results of the flow detection unit; and / or, The detection device includes a gas chromatograph.

8. A method for testing the lifetime of a hydrogen-free layer, characterized in that, include: Provide a hydrogen removal layer lifetime testing platform as described in any one of claims 1 to 7; A hydrogen removal layer is provided on the reaction vessel, the hydrogen removal layer separating the gas flow channel and the water flow channel; Turning on the gas source device to supply the hydrogen-oxygen mixed gas to the airflow passage, the hydrogen-oxygen mixed gas containing hydrogen in a content of φ in ; Water is supplied to the water flow channel so that the hydrogen removal layer is wetted by water; starting the detection device to detect the content φ of hydrogen in the gas flowing through the hydrogen elimination layer out ; the duration of time from when the gas source device is turned on to φ out is equal to φ in the duration of time from when the gas source device is turned on to φ the duration of time from when the gas source device is turned on to φ 9. The hydrogen removal layer lifetime testing method according to claim 8, characterized in that, The detection device intermittently detects the content φ of hydrogen in the gas flowing through the hydrogen elimination layer at a first interval duration out ; And / or, The hydrogen removal layer lifetime testing method also includes: The hydrogen removal efficiency η is calculated using the following formula: η = 1 - (φ out / φ in ).

10. The method for testing the lifetime of the hydrogen-free layer according to claim 8 or 9, characterized in that, When the hydrogen removal layer lifetime test platform further includes a back pressure valve, the hydrogen removal layer lifetime test method further includes: adjusting the back pressure valve to increase the gas pressure in the airflow channel; and / or, When the hydrogen removal layer lifetime testing platform further includes a water supply device, the hydrogen removal layer lifetime testing method further includes: activating the water supply device to supply hot water to the water flow channel; and / or, The hydrogen removal layer is a proton exchange membrane with hydrogen removal function. The proton exchange membrane with hydrogen removal function contains a mixture of catalyst and ionomer. The catalyst is used to catalyze the reaction of hydrogen and oxygen to produce water.

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