Accelerated aging test method for proton exchange membrane of fuel cell

Abstract

The invention relates to an accelerated aging test method for a proton exchange membrane of a fuel cell, and the method comprises the steps: controlling test equipment to carry out potential control circulation treatment on a pre-prepared fuel cell sample under a predetermined aging test working condition; moreover, in the process of each round of potential control cycle treatment, the test equipment is controlled to carry out aging cycle operation on the fuel cell sample, and voltage detection operation is carried out on the fuel cell sample after the aging cycle operation; the cycle number is controlled until the preset potential is reached, and the fuel cell sample after the accelerated aging test is obtained. According to the present invention, in each potential control cycle, the aging cycle operation is combined, such that the proton exchange membrane can be rapidly subjected to chemical degradation and performance change so as to obtain the fuel cell sample having the significant aging characteristic within the preset potential control cycle number. Compared with a traditional aging test mode, the test period is greatly shortened, and the test efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a method for accelerating aging testing of proton exchange membranes of fuel cells. Background Art

[0002] As an efficient and clean energy conversion device, fuel cells have broad application prospects in many fields, especially in the field of heavy vehicles, which is regarded as one of the main application scenarios in the future. However, the current fuel cell technology has the problem of poor durability of key components of fuel cells.

[0003] In proton exchange membrane fuel cells, the proton exchange membrane plays a vital role, but it is vulnerable to the attack of free radicals generated during operation, which leads to chemical degradation and eventually failure. In response to the chemical degradation problem of proton exchange membrane fuel cells, the current accelerated aging test methods of proton exchange membranes mainly include OCV potential holding method and hydrogen peroxide exposure method. In the OCV potential holding method, hydrogen peroxide is produced only by the reaction of air permeating from the cathode with hydrogen at the anode. The production efficiency is low and uncontrollable. The test time is long, usually more than 500 hours or to reach a specific aging endpoint index, which is not suitable for sample screening or comparative advantage discussion. In the hydrogen peroxide exposure method, although the in vitro experiment can be compared horizontally, it is difficult to reflect its performance in fuel cells. Summary of the invention

[0004] Based on this, it is necessary to provide a fuel cell proton exchange membrane accelerated aging test method that can solve the above-mentioned technical problems.

[0005] In a first aspect, the present application provides a fuel cell proton exchange membrane accelerated aging test method, the method comprising:

[0006] Under predetermined aging test conditions, the test equipment is controlled to perform a potential control cycle treatment on a pre-prepared fuel cell sample; wherein, during each round of potential control cycle treatment, the test equipment is controlled to perform an aging cycle operation on the fuel cell sample, and a voltage detection operation is performed on the fuel cell sample after the aging cycle operation;

[0007] Until the preset number of potential control cycles is reached, a fuel cell sample after accelerated aging test is obtained.

[0008] In one embodiment, the method comprises:

[0009] Under a constant potential condition, controlling the test equipment to use a voltage signal of a first excitation amplitude to perform a constant potential impedance spectrum test operation on the fuel cell sample;

[0010] Under a constant current condition, controlling a current signal of a second excitation amplitude to perform a constant current impedance spectrum test operation on the fuel cell sample;

[0011] The test equipment is controlled to cyclically execute the constant potential impedance spectrum test operation and the constant current impedance spectrum test operation until a preset number of aging cycles is reached.

[0012] In one embodiment, the voltage detection operation on the fuel cell sample after the aging cycle operation includes:

[0013] Under the condition of open circuit potential, controlling the test equipment to perform an impedance spectrum test operation on the fuel cell sample after the aging cycle operation with a voltage signal of a third excitation amplitude;

[0014] Control the electrical parameter monitoring equipment to monitor voltage data and impedance spectrum data generated by impedance spectrum testing operation.

[0015] In one embodiment, the method further comprises:

[0016] Under the predetermined test conditions of hydrogen leakage current density inside the membrane electrode, the linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell sample after the accelerated aging test to obtain the hydrogen leakage current density measurement result of the fuel cell sample.

[0017] In one embodiment, the method further comprises:

[0018] Under a predetermined potential holding test condition, the test equipment is controlled to perform an accelerated aging operation on the fuel cell sample using an OCV potential holding method to obtain a fuel cell control sample after accelerated aging;

[0019] The linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell control example after accelerated aging, and the hydrogen leakage current density measurement result of the fuel cell control example is obtained;

[0020] The durability test comparison results are determined based on the hydrogen leakage current density measurement results after durability using the potential control method and the hydrogen leakage current density measurement results using the OCV potential holding method.

[0021] In one embodiment, the method further comprises:

[0022] The control substance detection device detects and processes the substances produced on the cathode side of the fuel cell sample after the accelerated aging test to obtain a detection result; the detection result is used to characterize the state of the substances produced on the cathode side of the fuel cell sample during the accelerated aging test.

[0023] In one embodiment, the aging test conditions include a temperature range of 60-130°C, a humidity of 10-50%RH, an anode hydrogen flow rate of 0.1-1L / min, a cathode air flow rate of 0.1-1L / min, an anode back pressure of 0-100kPa (gauge pressure), a cathode back pressure of 0-100 kPa (gauge pressure), and a working electrode voltage range of 0-0.2V.

[0024] In one of the embodiments, the hydrogen leakage current density test conditions inside the above-mentioned membrane electrode include the anode being in a hydrogen atmosphere with a flow rate of 0.07-1L / min, the cathode being in a nitrogen atmosphere with a flow rate of 0.166L-1 / min, the temperature and humidity of the single cell are consistent with the target conditions in the actual power generation process, and the anode and cathode gas back pressure is 0 (gauge pressure).

[0025] In a second aspect, the present application also provides a fuel cell proton exchange membrane accelerated aging test device. The device comprises:

[0026] A potential control module is used to control the test equipment to perform potential control cycle processing on the pre-prepared fuel cell sample under the predetermined aging test conditions;

[0027] In each round of potential control cycle processing, the test equipment is controlled to perform an aging cycle operation on the fuel cell sample, and a voltage detection operation is performed on the fuel cell sample after the aging cycle operation;

[0028] Until the preset number of potential control cycles is reached, a fuel cell sample after accelerated aging test is obtained.

[0029] In a third aspect, the present application further provides a control device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method in the first aspect when executing the computer program.

[0030] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method in the first aspect when executed by a processor.

[0031] In a fifth aspect, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the method in the first aspect are implemented.

[0032] The above-mentioned fuel cell proton exchange membrane accelerated aging test method, under predetermined aging test conditions, controls the test equipment to perform potential control cycle treatment on the pre-prepared fuel cell sample; and in each round of potential control cycle treatment, controls the test equipment to perform aging cycle operation on the fuel cell sample, and performs voltage detection operation on the fuel cell sample after the aging cycle operation; until the preset number of potential control cycles is reached, the fuel cell sample after the accelerated aging test is obtained. In each round of potential control cycle, the present application, combined with the aging cycle operation, can quickly induce chemical degradation and performance changes of the proton exchange membrane, thereby obtaining a fuel cell sample with significant aging characteristics within the preset number of potential control cycles. Compared with the traditional aging test method, this greatly shortens the test cycle and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A diagram showing an application environment of a fuel cell proton exchange membrane accelerated aging test method in one embodiment;

[0034] Figure 2 A schematic diagram of a process for accelerating the aging test of a proton exchange membrane of a fuel cell in one embodiment;

[0035] Figure 3 A schematic diagram of a process for performing an aging cycle operation on a fuel cell sample in one embodiment;

[0036] Figure 4 is a schematic diagram of a flow chart of a voltage detection operation in one embodiment;

[0037] Figure 5 A schematic diagram of a process for performing an aging operation on a fuel cell control example in one embodiment;

[0038] Figure 6a A schematic diagram of a durability procedure for a fuel cell sample using a potential control method in one embodiment;

[0039] Figure 6b A schematic diagram of a durability procedure for a fuel cell control example using an OCV potential holding method in one embodiment;

[0040] Figure 7 A graph showing the test results of hydrogen leakage current density in one embodiment;

[0041] Figure 8 This is a diagram of OCV-EIS changes during aging potential cycles in one embodiment;

[0042] Fig. 9 This is a graph showing the 0.2V-EIS variation during aging potential cycling in one embodiment;

[0043] Fig.10A diagram showing changes in OCV-EIS during monitoring potential in one embodiment;

[0044] Fig.11 A diagram showing changes in monitoring potential as aging progresses in one embodiment;

[0045] Fig.12 FIG. 4 is a diagram showing the internal structure of a control device in one embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] The fuel cell proton exchange membrane accelerated aging test method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the control device 101 is connected to the test device 102, the electrical parameter monitoring device 103 and the material detection device 104 through the network. Among them, the control device 102 can be but not limited to various personal computers, laptops, smart phones and tablets. The test device 102 can be a specially designed fuel cell test bench. The electrical parameter monitoring device 103 can be a high-precision data acquisition instrument. The material detection device 104 can be a comprehensive detection system including a variety of analytical instruments, which can accurately measure the concentration of hydrogen peroxide, etc.

[0048] In an exemplary embodiment, see Figure 2 The present invention provides a fuel cell proton exchange membrane accelerated aging test method, which is applied to Figure 1 The control device 102 in FIG. 1 is used as an example to illustrate, including:

[0049] S201, under a predetermined aging test condition, controlling the test equipment to perform a potential control cycle process on a pre-prepared fuel cell sample; wherein, during each round of the potential control cycle process, controlling the test equipment to perform an aging cycle operation on the fuel cell sample, and performing a voltage detection operation on the fuel cell sample after the aging cycle operation;

[0050] S202, until a preset number of potential control cycles is reached, and a fuel cell sample after accelerated aging test is obtained.

[0051] Among them, the proton exchange membrane is a key component in the fuel cell. It has selective permeability and only allows protons (hydrogen ions) to pass through. It plays the role of conducting protons and separating the fuel (hydrogen on the anode side) and the oxidant (air or oxygen on the cathode side), ensuring that the electrochemical reaction takes place on the electrodes on both sides while preventing the direct mixing of electrons and gases.

[0052] In the embodiment of the present application, the control device 102 first sets the parameters of the aging test conditions. The aging test conditions can be set to a temperature range of 60-130°C, a humidity of 10-50%RH, an anode hydrogen flow rate of 0.1-1L / min, a cathode air flow rate of 0.1-1L / min, an anode back pressure of 0-100kPa (gauge pressure), and a cathode back pressure of 0-100kPa (gauge pressure), and a working electrode voltage range of 0-0.2V. The parameter range of the aging test conditions of the present application will be adjusted according to the actual test environment. The parameter range of the aging test conditions can be adjusted according to the following content:

[0053] As for the temperature range, if the temperature is too low, the reaction activity will decrease and the fuel cell will not be able to generate electricity normally. If the temperature is too high, it will exceed the glass transition temperature of the proton exchange membrane, reduce its mechanical strength, and cause the fuel cell to fail. Therefore, the test temperature needs to be 60°C or higher, but not more than 130°C.

[0054] For the humidity range, if the humidity is too low, the reaction activity is low, the proton conduction resistance is large, and the fuel cell cannot generate electricity normally. If the humidity is too high, the sulfonic acid group dissociation rate of the proton exchange membrane is high, the effect of free radicals attacking the sulfonic acid group becomes poor, and the aging acceleration effect is affected, so the humidity can be set to 10-50%RH.

[0055] For the anode hydrogen flow rate, if the anode hydrogen flow rate is too low, it cannot provide the reactants required by the fuel cell. If the anode hydrogen flow rate is too high, the excess reactants cannot be fully utilized by the fuel cell, resulting in a waste of resources. Therefore, the anode hydrogen flow rate can be set to 0.1-1L / min.

[0056] For the cathode hydrogen flow, if the cathode air flow is too low, it cannot provide the reactants required by the fuel cell. If the cathode air flow is too high, the excess reactants cannot be fully utilized by the fuel cell, which is a waste of resources. In addition, the excess air will take away the generated hydrogen peroxide faster, affecting the acceleration effect. Therefore, the cathode air flow can be set to 0.1-1L / min.

[0057] For the anode and cathode back pressure, the anode and cathode back pressure increases the concentration of reactants, increases the concentration difference of the gas with the counter electrode, increases gas permeation, and the pressure difference between the anode and cathode provides a certain acceleration effect, which is conducive to accelerated aging. However, excessive back pressure and pressure difference will cause mechanical damage to the proton exchange membrane, and aging cannot be evaluated normally. Therefore, the anode back pressure can be set to 0-100kPa (gauge pressure) and the cathode back pressure can be set to 0-100kPa (gauge pressure).

[0058] For the working electrode voltage, when the working electrode voltage is set at 0.2V or below, the generation rate of hydrogen peroxide increases sharply. This is because oxygen atoms are directly reduced by hydrogen atoms deposited on the platinum surface at a low potential to produce hydrogen peroxide. However, if the voltage is too low, a reverse polarity phenomenon will occur, and the fuel cell cannot generate electricity normally; if the voltage is too high, the hydrogen peroxide yield is too low, and the acceleration effect is affected. Therefore, the working electrode voltage range can be set to 0-0.2V.

[0059] Prepare the pre-prepared fuel cell sample, in which the proton exchange membrane uses a 10μm membrane. The control device 102 controls the mechanical device to assemble the gas diffusion layer, the gold-plated current collector, and the graphite parallel flow field plate (channels and ribs with a width and depth of 0.4mm) on both sides of the proton exchange membrane in sequence. During the assembly process, ensure that the position of each component is accurate and the connection is tight, complete the preparation of the fuel cell single cell, and the activity range of the test is 1cmx2cm. Then connect the prepared fuel cell sample to the test equipment to ensure that the electrical connection and the gas channel connection are normal, so as to facilitate subsequent test operations.

[0060] The control device 102 controls the test device to start the first round of potential control cycle. First, the potential of the fuel cell sample is set to the range of 0-0.2V, and the power supply output voltage is adjusted by sending instructions to the test device. Then the excitation amplitude is selected to be 10mV, and the constant potential impedance spectrum test function is started. Under this potential and excitation amplitude, the test device applies an AC signal to the fuel cell sample, measures its response to the signal, and obtains electrochemical impedance spectrum data, which reflects the electrochemical properties of the proton exchange membrane such as proton conduction and charge transfer under the working electrode voltage range.

[0061] Next, the control device 102 sets the potential to OCV (open circuit potential), sets the current to 0, and sets the excitation amplitude to 2 mA to perform a constant current impedance spectrum test. The test equipment measures the impedance response of the fuel cell sample at the open circuit potential when a small current excitation (2 mA) is applied, and obtains the impedance spectrum data at this time for analyzing the impedance characteristics of the membrane in the open circuit state.

[0062] After completing the above two potential tests, the control device 102 controls the test device to keep the fuel cell sample in an open circuit potential state and perform voltage detection operations. The voltage measurement module in the test device monitors and records the open circuit voltage value of the fuel cell sample in real time, and transmits the data back to the control device 102 for storage and analysis.

[0063] Repeat the potential test steps in the first round to obtain new impedance spectrum data for comparison with the first round data to observe the performance change trend of the proton exchange membrane during the aging process.

[0064] Similarly, after completing the potential test, the open circuit potential is maintained for voltage detection and the voltage value is recorded. Subsequent potential control cycles are analogous, and the above operations are repeated continuously according to the preset number of cycles (such as 10 times). Each cycle can make the proton exchange membrane undergo a further aging process and obtain the performance data of the corresponding stage.

[0065] After each potential control cycle is completed, the control device 102 counts the number of completed cycles. When the count reaches a preset number of potential control cycles (eg, 10 times), it is determined that the end condition is met and the potential control cycle processing process is stopped.

[0066] After the cycle is finished, the control device 102 controls the test device to safely remove the fuel cell sample after the accelerated aging test from the test system.

[0067] The above-mentioned fuel cell proton exchange membrane accelerated aging test method, under predetermined aging test conditions, controls the test equipment to perform potential control cycle treatment on the pre-prepared fuel cell sample; and in each round of potential control cycle treatment, controls the test equipment to perform aging cycle operation on the fuel cell sample, and performs voltage detection operation on the fuel cell sample after the aging cycle operation; until the preset number of potential control cycles is reached, the fuel cell sample after the accelerated aging test is obtained. In each round of potential control cycle, the present application, combined with the aging cycle operation, can quickly induce chemical degradation and performance changes of the proton exchange membrane, thereby obtaining a fuel cell sample with significant aging characteristics within the preset number of potential control cycles. Compared with the traditional aging test method, this greatly shortens the test cycle and improves the test efficiency.

[0068] In an exemplary embodiment, based on the above embodiment, see Figure 3 , the method of the embodiment of the present application comprises the following steps:

[0069] S301, under a constant potential condition, controlling a test device to use a voltage signal of a first excitation amplitude to perform a constant potential impedance spectrum test operation on a fuel cell sample;

[0070] Under the constant current working condition, the current signal of the second excitation amplitude is controlled to perform a constant current impedance spectrum test operation on the fuel cell sample.

[0071] In the embodiment of the present application, during the constant potential impedance spectrum test, the control device 102 first sets the test device to a constant potential condition, sends instructions to the power control module of the test device, accurately adjusts the output voltage to the required constant potential value, and ensures that the potential remains stable during the entire test process.

[0072] Select a voltage signal with a suitable first excitation amplitude. The control device 102 sends a command to the signal generator of the test device, sets its output frequency range, and starts the signal generator to generate an AC voltage signal with the frequency range and an amplitude of 10mV. The signal is applied to the fuel cell sample through the connection line of the test device.

[0073] At the same time, the measurement module of the test equipment starts working to measure the current response of the fuel cell sample to the applied AC voltage signal. The measured voltage and current data are transmitted back to the control device 102 in real time. The control device 102 uses the built-in data analysis algorithm, according to Ohm's law and the calculation principle of electrochemical impedance spectrum, to calculate the electrochemical impedance spectrum data of the fuel cell sample at constant potential, including the curve of the real and imaginary parts of the impedance changing with the frequency, and stores these data in the local memory for subsequent analysis.

[0074] During the constant current impedance spectrum test, the control device 102 switches the test device to a constant current operating state, sends instructions to the current source control module of the test device, sets the output constant current value to 0, and ensures that the current is stable.

[0075] The current signal of the second excitation amplitude is selected. The control device 102 sends instructions to the signal generator again, sets its output frequency range, and starts to generate a signal with the frequency range and current. These signals are applied to the fuel cell sample at the same time.

[0076] The measurement module of the test equipment measures the voltage response of the fuel cell sample under this constant current excitation. The measurement data is transmitted back to the control device 102, and the control device 102 uses a data analysis algorithm similar to the previous one to calculate the electrochemical impedance spectrum data under this constant current condition and store it.

[0077] S302, controlling the test equipment to cyclically execute a constant potential impedance spectrum test operation and a constant current impedance spectrum test operation until a preset number of aging cycles is reached.

[0078] In the embodiment of the present application, the control device 102 may have a built-in cycle counter, and the initial value is set to 0. After completing a constant potential impedance spectrum test operation and a constant current impedance spectrum test operation, the cycle counter is incremented by 1.

[0079] The control device 102 compares the value of the cycle counter with the preset number of aging cycles (e.g., 10 times). If the value of the cycle counter is less than the preset number of aging cycles, the control device 102 executes step S201 again, i.e., re-performs the constant potential impedance spectrum test operation and the constant current impedance spectrum test operation; if the value of the cycle counter is equal to the preset number of aging cycles, the cycle execution is stopped and the next test phase is entered or the current aging cycle operation is completed.

[0080] The embodiment of the present application performs impedance spectrum test operations under constant potential and constant current conditions respectively, and executes the test multiple times in a cycle. By analyzing the impedance spectrum, the changing laws of electrochemical processes such as proton conduction and charge transfer of the proton exchange membrane at different aging stages can be accurately characterized from multiple angles.

[0081] In an exemplary embodiment, based on the above embodiment, see Figure 4 The embodiment of the present application relates to a voltage detection operation on a fuel cell sample after an aging cycle operation, comprising the following steps:

[0082] S401, under the condition of open circuit potential, controlling the testing equipment to perform an impedance spectrum test operation on the fuel cell sample after the aging cycle operation with a voltage signal of a third excitation amplitude.

[0083] Among them, the open circuit potential refers to the potential difference between the two electrodes when the fuel cell has no current output (that is, the external circuit is in an open circuit state).

[0084] In the embodiment of the present application, the control device sets the voltage signal value of the third excitation amplitude according to the test requirements (the specific amplitude can be adjusted according to the characteristics of the fuel cell sample and the research purpose). Then, an instruction is sent to the test device to set the frequency range for the impedance spectrum test under the excitation amplitude, and determine the scanning mode and the number of scanning points.

[0085] The control device starts the test device so that it applies an AC voltage signal with a third excitation amplitude to the fuel cell sample after the aging cycle operation according to the set parameters. At the same time, the current response of the fuel cell sample to the AC voltage signal is measured in real time. During the test, as the frequency changes in sequence according to the set scanning method, the measurement module will continuously collect the corresponding voltage and current data at different frequencies. Then the test device calculates the impedance spectrum data of the fuel cell sample at the open circuit potential according to the measured voltage and current data and the calculation method of the electrochemical impedance spectrum. The test device transmits the calculated impedance spectrum data to the control device in real time, and the control device stores the data in the local memory for subsequent analysis.

[0086] S402, controlling the electrical parameter monitoring device to monitor voltage data and impedance spectrum data generated by the impedance spectrum test operation.

[0087] In the embodiment of the present application, the control device checks whether the connection between the electrical parameter monitoring device and the test device is normal to ensure that the data transmission channel is unobstructed. The electrical parameter monitoring device is initialized, such as setting the time interval for data collection (such as collecting data every 10 milliseconds), the data storage format, etc.

[0088] When the test equipment performs an impedance spectrum test operation under an open circuit potential, the electrical parameter monitoring equipment begins to collect voltage data at set time intervals, as well as impedance spectrum data generated by the impedance spectrum test operation. These voltage data reflect the potential response of the fuel cell sample when it is stimulated by an AC signal under an open circuit potential. The impedance spectrum data reflects the changes in electrochemical characteristics such as charge transfer impedance. The electrical parameter monitoring equipment transmits the collected voltage data and impedance spectrum data to the control device 102 in real time. After receiving the data, the control device 102 can perform preliminary data analysis, such as calculating the voltage data and the average value, maximum value, minimum value, standard deviation and other statistical parameters of the charge transfer impedance, so as to quickly understand the basic characteristics and changing trends of the voltage data.

[0089] The embodiments of the present application can flexibly adjust the parameters of the impedance spectrum test under open circuit potential according to different research purposes and characteristics of fuel cell samples, which can meet different needs and provide strong support for the development of fuel cell technology.

[0090] In an exemplary embodiment, based on the above embodiments, the method of the embodiment of the present application also includes: under a predetermined hydrogen leakage current density test condition inside the membrane electrode, a linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell sample after the accelerated aging test to obtain the hydrogen leakage current density measurement result of the fuel cell sample.

[0091] In the embodiment of the present application, the control device 102 first sets the parameters of the hydrogen leakage current density test conditions inside the membrane electrode. The hydrogen leakage current density test conditions inside the membrane electrode can be set to: the anode is in a hydrogen atmosphere with a flow rate of 0.07L / min, the cathode is in a nitrogen atmosphere with a flow rate of 0.166L / min, the single cell temperature is 80°C, the humidified anode and cathode gas atmosphere is 90% RH and the back pressure is 0 (gauge pressure). The parameter range of the hydrogen leakage current density test conditions inside the membrane electrode in the embodiment of the present application will be adjusted according to the actual test environment and is not specifically limited.

[0092] The control device 102 starts a linear voltammetric scan measurement. For example, the scanning potential range is set to start from the open circuit potential and gradually scan to 0.6 V, and the scanning speed is set to 20 mV / s. The potential applied to the fuel cell sample is linearly changed according to the set scanning speed, and the corresponding current value is measured in real time.

[0093] The control device 102 can calculate the hydrogen leakage current density value corresponding to each potential point, and store these data in a local memory to form a hydrogen leakage current density measurement result of the fuel cell sample.

[0094] In the embodiment of the present application, the linear voltammetric scanning method is used to measure the hydrogen leakage current density test condition inside the membrane electrode, so that the barrier performance of the proton exchange membrane to hydrogen and the effect of aging on it can be accurately evaluated. The hydrogen leakage current density is a key indicator that directly reflects the sealing and durability of the proton exchange membrane. At different aging stages, the microstructure and chemical composition of the proton exchange membrane may change, resulting in a decrease in its barrier ability to hydrogen, thereby increasing the hydrogen leakage current density. By accurately measuring and analyzing the measurement results of the hydrogen leakage current density, the degree of aging of the proton exchange membrane can be accurately determined.

[0095] In an exemplary embodiment, based on the above embodiment, see Figure 5 , the method of the embodiment of the present application further includes the following steps:

[0096] S501, under a predetermined potential holding test condition, controlling the test equipment to perform an accelerated aging operation on a fuel cell sample using an OCV potential holding method to obtain a fuel cell control sample after accelerated aging.

[0097] Among them, the fuel cell control sample refers to the fuel cell sample obtained after accelerated aging operation under specific working conditions by OCV potential holding method. Its main function is to form a comparative comparison with the fuel cell sample obtained by potential control method, and to analyze the influence of different aging test methods on the durability of proton exchange membrane by comparing the differences in various performance indicators of fuel cell samples under different aging methods, and to show the performance change law of proton exchange membrane under different aging paths.

[0098] In the embodiment of the present application, the control device 102 sets the potential to maintain the test condition parameters. The temperature is set to 90°C and maintained stable by controlling the heating system of the test equipment. The humidity is set to 30%RH and is precisely controlled by a humidity regulator. The anode hydrogen flow rate is set to 1L / min, and the cathode air flow rate is set to 1L / min, and the flow rates are adjusted by flow controllers respectively. The anode back pressure is set to 150kPa (gauge pressure), and the cathode back pressure is set to 100kPa (gauge pressure), and the pressure is achieved and stabilized by a pressure regulator.

[0099] The control device 102 maintains the potential of the fuel cell sample at the open circuit potential (OCV). By sending instructions to the potential control module of the test device, it is ensured that the potential is stable near the OCV value during the entire test process (the fluctuation range is controlled within ±1mV). The potential is maintained continuously for aging operation, and the aging time is set to 45 hours as one cycle, and multiple cycles (for example, 5 cycles) are performed as needed. During the aging process, the test equipment continuously monitors various parameters of the fuel cell sample (such as temperature, humidity, gas flow, pressure, and potential, etc.), and transmits the data to the control device 102 for recording and analysis to ensure that the aging process is stable under the set working conditions, and obtain a fuel cell control example after accelerated aging.

[0100] S502, using a linear voltammetric scanning method to measure the hydrogen leakage current density of the fuel cell control example after accelerated aging, to obtain a hydrogen leakage current density measurement result of the fuel cell control example.

[0101] In the embodiment of the present application, the control device 102 sets the operating parameters similar to the previous hydrogen leakage current density test. For example, the temperature is 80°C, which is maintained by the heating element. The humidity is 90%RH, which is achieved by the humidity regulator. The anode hydrogen flow rate is 0.07L / min, and the cathode nitrogen flow rate is 0.166L / min, which is precisely controlled by the flow controller. The anode and cathode back pressures are both 0 (gauge pressure), which is kept stable by the pressure regulator.

[0102] The control device 102 uses a linear voltammetric scanning method. The scanning potential range is set from the open circuit potential to 0.6V, and the scanning speed is 20mV / s. The potential applied to the fuel cell control example after accelerated aging is linearly changed within the potential range, and the corresponding current value is measured in real time. The measured potential-current data is transmitted to the control device 102, and the control device 102 calculates the hydrogen leakage current density measurement result of the fuel cell control example and stores the data.

[0103] S503, determining a durability test comparison result according to the hydrogen leakage current density measurement result after durability using the potential control method and the hydrogen leakage current density measurement result using the OCV potential holding method.

[0104] In the embodiment of the present application, the control device first obtains the hydrogen leakage current density measurement result data of the fuel cell sample obtained after the durability test using the potential control method, and the hydrogen leakage current density measurement result data of the fuel cell control example using the OCV potential holding method obtained through the above steps. The two sets of data are compared according to the same potential point, measurement time and other dimensions, and the durability test comparison results are determined based on the results of the comparative analysis. If it is found that the hydrogen leakage current density of the fuel cell control example increases faster and has a larger value than the fuel cell sample at each corresponding potential point or within the same test time, it means that under the OCV potential holding method, the hydrogen barrier performance of the proton exchange membrane decreases more significantly and the durability is relatively poor; conversely, if the hydrogen leakage current density of the fuel cell control example increases relatively slowly and has a relatively small value, it means that the durability performance of the proton exchange membrane may be better under this method.

[0105] like Figure 6a and 6b As shown, in the potential control method of embodiment (a), the combined process from initial setting to test operation at different potentials and aging cycle and detection voltage is demonstrated. For example, an impedance spectrum test is first performed at a specific potential, and then an aging potential cycle is entered, and each cycle includes a time setting (such as a cycle duration of 88 minutes, and a total of three cycles). Among them, the hydrogen peroxide generation potential D in the aging potential cycle is [0-0.2V], the stage time A is (0, +∞), the OCV-EIS stage time B in the aging potential cycle is [0, +∞), the number of aging potential cycles n is [1, +∞), the monitoring potential time C is [2, 20], and the total cycle (aging potential cycle + monitoring potential) number of cycles m is [1, +∞).

[0106] By comparing the OCV potential holding method of comparative example (b) with that of embodiment (a), it can be intuitively seen that there are significant differences between the two testing methods in terms of process and time scale.

[0107] like Figure 7 The figure shows the test result of hydrogen leakage current density. In the potential control method used in the embodiment of the present application, the hydrogen leakage current density decays to 4.3mA / cm² in a relatively short time (4.4h). The curve shows a specific upward trend, reflecting the change of the hydrogen barrier performance of the proton exchange membrane during the accelerated aging process of the potential control method. In contrast, the equivalent endurance time required for the comparative OCV potential holding method to achieve a similar degree of decay is 143h, and its curve changes relatively smoothly, with a much longer time span.

[0108] like Figure 8The figure shows the OCV-EIS variation during the aging potential cycle. As the aging potential cycle progresses, the curve shows a series of regular changes, which reflect the dynamic evolution of the internal electrochemical process of the proton exchange membrane at the open circuit potential. For example, the shape and position of the curve and the change of impedance value at a specific frequency point.

[0109] like Fig. 9 The figure shows the change of 0.2V-EIS in the aging potential cycle, and the change trend of EIS when the potential is set to 0.2 V. At a potential of 0.2 V, the change characteristics of the curve are different from those of OCV-EIS, which indicates that the electrochemical behavior of the proton exchange membrane at different potentials is significantly different.

[0110] like Fig.10 The figure shows the change of OCV-EIS (open circuit potential-electrochemical impedance spectroscopy) during the aging potential cycle. The shape and trend of the curve intuitively show the complex change process of the electrochemical impedance spectrum of the proton exchange membrane at open circuit potential as the aging potential cycle progresses.

[0111] like Fig.11 The figure shows the change of monitoring potential with aging. By giving the same time, the decay rate of potential after one aging cycle is evaluated.

[0112] The embodiment of the present application uses the OCV potential holding method to perform accelerated aging operations on fuel cell samples and measures their hydrogen leakage current density. By comparing with other aging test methods, the durability of the proton exchange membrane can be comprehensively and accurately evaluated.

[0113] In an exemplary embodiment, based on the above-mentioned embodiment, the method of the embodiment of the present application also includes the following: controlling the substance detection equipment to detect and process the substance generated on the cathode side of the fuel cell sample after the accelerated aging test to obtain the detection result; the detection result is used to characterize the state of the substance generated on the cathode side of the fuel cell sample after the accelerated aging test.

[0114] In the embodiment of the present application, the control device 102 first ensures that the connection channel between the substance detection device and the cathode side of the fuel cell sample is unobstructed and well sealed. The preheating procedure of the substance detection device is started to make the detection instrument reach a stable working state. For example, for an instrument for detecting hydrogen peroxide, preheat to a set temperature (such as 40°C) to ensure the accuracy of the detection.

[0115] Calibrate the material detection equipment and adjust the detection parameters of the material detection equipment according to standard substances (such as hydrogen peroxide solution with known concentration, fluoride ion standard solution, etc.), such as the wavelength range of the spectrometer, the potential response range of the ion selective electrode, etc., to ensure that the target substance can be accurately detected.

[0116] The control device 102 controls the substance detection device to start detecting the substances generated on the cathode side of the fuel cell sample after the accelerated aging test. For the detection of hydrogen peroxide, the spectrophotometric method is adopted. The substance detection device extracts a certain amount of gas or solution from the cathode side through the sampling system, introduces it into a reaction cell containing a specific color developer (such as titanium reagent), measures the absorbance change of the solution under a certain wavelength of light (such as 410nm), and calculates the concentration of hydrogen peroxide based on the pre-established standard curve of absorbance and hydrogen peroxide concentration.

[0117] For the detection of fluoride ions, the ion selective electrode method is used. The material detection equipment inserts the fluoride ion selective electrode and the reference electrode into the cathode side sampling solution, measures the potential difference between the electrodes, and converts the potential difference into the fluoride ion concentration according to the Nernst equation. At the same time, the material detection equipment can also use inductively coupled plasma mass spectrometry (ICP-MS) to detect metal ions. By introducing the cathode side sampling solution into the ICP-MS instrument, the metal ions in the solution are ionized by plasma, and then separated and detected according to the mass-to-charge ratio of the ions to determine the type and concentration of the metal ions.

[0118] The material detection device transmits the concentration data of the detected hydrogen peroxide, fluoride ions, metal ions and other substances and related detection information (such as detection time, detection conditions, etc.) to the control device 102 in real time. The control device 102 organizes and stores these data to form a detection result for subsequent analysis.

[0119] The test results of the embodiments of the present application not only reflect the aging of the proton exchange membrane, but also comprehensively evaluate the performance and health status of the fuel cell. Changes in the substances on the cathode side will affect the electrochemical performance of the fuel cell. For example, an increase in hydrogen peroxide may cause the cathode potential to drop, thereby affecting the output voltage and power of the fuel cell. By monitoring these substances and combining them with other performance indicators (such as hydrogen leakage current density, electrochemical impedance spectroscopy, etc.), we can have a more comprehensive understanding of the performance evolution of the fuel cell during the aging process.

[0120] In an exemplary embodiment, based on the above embodiment, the method of the embodiment of the present application further includes the following steps:

[0121] Step 1: In each round of potential control cycle, under constant potential conditions, control the test equipment to use a voltage signal of a first excitation amplitude to perform a constant potential impedance spectrum test operation on the fuel cell sample;

[0122] Under the constant current condition, controlling the current signal of the second excitation amplitude to perform a constant current impedance spectrum test operation on the fuel cell sample; cyclically performing the constant potential impedance spectrum test operation and the constant current impedance spectrum test operation until a preset number of aging cycles is reached;

[0123] Step 2: Under the condition of open circuit potential, control the test equipment to perform an impedance spectrum test operation on the fuel cell sample after the aging cycle operation with a voltage signal of a third excitation amplitude; control the electrical parameter monitoring equipment to monitor voltage data and impedance spectrum data generated by the impedance spectrum test operation;

[0124] Step 3: Under the predetermined test conditions of hydrogen leakage current density inside the membrane electrode, a linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell sample after the accelerated aging test to obtain the hydrogen leakage current density measurement result of the fuel cell sample;

[0125] Step 4: Under a predetermined potential holding test condition, the test equipment is controlled to perform an accelerated aging operation on the fuel cell sample using the OCV potential holding method to obtain a fuel cell control example after accelerated aging; a linear voltammetric scanning method is used to perform a hydrogen leakage current density measurement process on the fuel cell control example after accelerated aging to obtain a hydrogen leakage current density measurement result of the fuel cell control example; based on the hydrogen leakage current density measurement result after endurance using the potential control method and the hydrogen leakage current density measurement result of the control example using the OCV potential holding method, a durability test comparison result is determined;

[0126] Step 5: Control the substance detection equipment to detect and process the substances generated on the cathode side of the fuel cell sample after the accelerated aging test to obtain the detection results.

[0127] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0128] Based on the same inventive concept, the embodiment of the present application also provides a fuel cell proton exchange membrane accelerated aging test device for implementing the fuel cell proton exchange membrane accelerated aging test method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more fuel cell proton exchange membrane accelerated aging test device embodiments provided below can refer to the above limitations on the fuel cell proton exchange membrane accelerated aging test method, and will not be repeated here.

[0129] In one embodiment, the present application provides a fuel cell proton exchange membrane accelerated aging test device, comprising:

[0130] The potential control module is used to control the test equipment to perform potential control cycle processing on the pre-prepared fuel cell samples under predetermined aging test conditions; wherein, during each round of potential control cycle processing, the test equipment is controlled to perform aging cycle operation on the fuel cell samples, and to perform voltage detection operation on the fuel cell samples after the aging cycle operation; until the preset number of potential control cycles is reached, the fuel cell samples after the accelerated aging test are obtained.

[0131] In one embodiment, the potential control module includes:

[0132] A constant-potential operation unit, used to control the test equipment to perform a constant-potential impedance spectrum test operation on the fuel cell sample using a voltage signal of a first excitation amplitude under a constant-potential condition;

[0133] A constant current operation unit, used for controlling a current signal of a second excitation amplitude to perform a constant current impedance spectrum test operation on the fuel cell sample under a constant current condition;

[0134] The cyclic operation unit is used to control the test equipment to cyclically perform the constant potential impedance spectrum test operation and the constant current impedance spectrum test operation until a preset number of aging cycles is reached.

[0135] In one embodiment, the potential control module further includes:

[0136] An impedance spectrum testing unit, used for controlling the testing equipment to perform an impedance spectrum testing operation on the fuel cell sample after the aging cycle operation with a voltage signal of a third excitation amplitude under the condition of an open circuit potential;

[0137] The data monitoring unit is used to control the electrical parameter monitoring device to monitor the voltage data and the impedance spectrum data generated by the impedance spectrum testing operation.

[0138] In one embodiment, the above device further comprises:

[0139] The sample hydrogen leakage current density measurement module is used to measure the hydrogen leakage current density of the fuel cell sample after the accelerated aging test by using the linear voltammetric scanning method under the predetermined hydrogen leakage current density test conditions inside the membrane electrode to obtain the hydrogen leakage current density measurement result of the fuel cell sample.

[0140] In one embodiment, the above device further comprises:

[0141] A control example aging module is used to control the test equipment to perform accelerated aging operation on the fuel cell sample using the OCV potential holding method under a predetermined potential holding test condition to obtain a fuel cell control example after accelerated aging;

[0142] A control example hydrogen leakage current density measurement module is used to measure the hydrogen leakage current density of the fuel cell control example after accelerated aging using a linear voltammetric scanning method to obtain a hydrogen leakage current density measurement result of the fuel cell control example;

[0143] The durability comparison module is used to determine the durability test comparison result based on the hydrogen leakage current density measurement result after durability using the potential control method and the hydrogen leakage current density measurement result using the control example OCV potential holding method.

[0144] In one embodiment, the above device further comprises:

[0145] The material detection module is used to control the material detection equipment to detect and process the material generated on the cathode side of the fuel cell sample after the accelerated aging test to obtain the detection result; the detection result is used to characterize the state of the material generated on the cathode side of the fuel cell sample after the accelerated aging test.

[0146] Each module in the above fuel cell proton exchange membrane accelerated aging test device can be implemented in whole or in part by software, hardware and their combination. Each module can be embedded in or independent of the processor in the control device in the form of hardware, or can be stored in the memory in the control device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0147] In one embodiment, a control device is provided. The control device may be a terminal, and its internal structure diagram may be as follows: Fig.12As shown. The control device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the control device is used to provide computing and control capabilities. The memory of the control device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the control device is used to exchange information between the processor and the external device. The communication interface of the control device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a fuel cell proton exchange membrane accelerated aging test method is implemented. The display unit of the control device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the control device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the control device shell, or an external keyboard, touchpad or mouse.

[0148] Those skilled in the art will understand that Fig.12 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the control device to which the scheme of the present application is applied. The specific control device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0149] In one embodiment, a control device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0150] Under predetermined aging test conditions, controlling the test equipment to perform potential control cycle treatment on the pre-prepared fuel cell sample;

[0151] In each round of potential control cycle, the test equipment is controlled to perform an aging cycle operation on the fuel cell sample, and a voltage detection operation is performed on the fuel cell sample after the aging cycle operation;

[0152] Until the preset number of potential control cycles is reached, a fuel cell sample after accelerated aging test is obtained.

[0153] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0154] Under a constant potential condition, controlling the test equipment to use a voltage signal of a first excitation amplitude to perform a constant potential impedance spectrum test operation on the fuel cell sample;

[0155] Under a constant current condition, controlling a current signal of a second excitation amplitude to perform a constant current impedance spectrum test operation on the fuel cell sample;

[0156] The constant potential impedance spectrum test operation and the constant current impedance spectrum test operation are cyclically performed until a preset number of aging cycles is reached.

[0157] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0158] Under the condition of open circuit potential, controlling the test equipment to perform an impedance spectrum test operation on the fuel cell sample after the aging cycle operation with a voltage signal of a third excitation amplitude;

[0159] The electrical parameter monitoring device is controlled to monitor the voltage data and the impedance spectrum data generated by the impedance spectrum testing operation.

[0160] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0161] Under the predetermined test conditions of hydrogen leakage current density inside the membrane electrode, the linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell sample after the accelerated aging test to obtain the hydrogen leakage current density measurement result of the fuel cell sample.

[0162] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0163] Under a predetermined potential holding test condition, the test equipment is controlled to perform an accelerated aging operation on the fuel cell sample using an OCV potential holding method to obtain a fuel cell control sample after accelerated aging;

[0164] The linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell control example after accelerated aging, and the hydrogen leakage current density measurement result of the fuel cell control example is obtained;

[0165] The durability test comparison results are determined based on the hydrogen leakage current density measurement results after durability using the potential control method and the hydrogen leakage current density measurement results using the OCV potential holding method.

[0166] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0167] The control substance detection device detects and processes the substances produced on the cathode side of the fuel cell sample after the accelerated aging test to obtain a detection result; the detection result is used to characterize the state of the substances produced on the cathode side of the fuel cell sample after the accelerated aging test.

[0168] According to some embodiments of the present application, a computer program product is also provided, and when the computer program is executed by a processor, the above method can be implemented. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, part or all of the above method can be implemented in whole or in part according to the process or function described in the embodiment of the present application.

[0169] According to some embodiments of the present application, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory including instructions, and the above instructions can be executed by a processor of an electronic device to complete the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0170] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0171] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0172] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0173] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A fuel cell proton exchange membrane accelerated aging test method, characterized in that: The method comprises: Under predetermined aging test conditions, controlling the test equipment to perform multiple rounds of potential control cycle processing on the pre-prepared fuel cell sample; wherein, during each round of potential control cycle processing, controlling the test equipment to perform an aging cycle operation on the fuel cell sample, and performing a voltage detection operation on the fuel cell sample after the aging cycle operation; Until the preset number of potential control cycles is reached, the fuel cell sample after the accelerated aging test is obtained.

2. The method according to claim 1, characterized in that The method further comprises: Under a constant potential condition, controlling the test device to use a voltage signal of a first excitation amplitude to perform a constant potential impedance spectrum test operation on the fuel cell sample; Under a constant current condition, controlling a current signal of a second excitation amplitude to perform a constant current impedance spectrum test operation on the fuel cell sample; The test device is controlled to cyclically execute the constant potential impedance spectrum test operation and the constant current impedance spectrum test operation until a preset number of aging cycles is reached.

3. The method according to claim 1, characterized in that The voltage detection operation of the fuel cell sample after the aging cycle operation includes: Under the condition of open circuit potential, controlling the test equipment to perform an impedance spectrum test operation on the fuel cell sample after the aging cycle operation with a voltage signal of a third excitation amplitude; The electrical parameter monitoring device is controlled to monitor the voltage data and the impedance spectrum data generated by the impedance spectrum testing operation.

4. The method according to claim 1, characterized in that: The method further comprises: Under the predetermined test conditions of hydrogen leakage current density inside the membrane electrode, the linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell sample after the accelerated aging test to obtain the hydrogen leakage current density measurement result of the fuel cell sample.

5. The method according to claim 4, characterized in that The method further comprises: Under a predetermined potential holding test condition, controlling the test equipment to perform an accelerated aging operation on the fuel cell sample using an OCV potential holding method to obtain a fuel cell control sample after accelerated aging; The linear voltammetric scanning method is used to measure the hydrogen leakage current density of the fuel cell control example after accelerated aging to obtain the hydrogen leakage current density measurement result of the fuel cell control example; The durability test comparison results are determined based on the hydrogen leakage current density measurement results after durability using the potential control method and the hydrogen leakage current density measurement results using the OCV potential holding method.

6. The method according to claim 5, characterized in that The method further comprises: The control substance detection device detects and processes the substances produced on the cathode side of the fuel cell sample after the accelerated aging test to obtain a detection result; the detection result is used to characterize the state of the substances produced on the cathode side of the fuel cell sample during the accelerated aging test.

7. The method according to claim 1, characterized in that The aging test conditions include a temperature range of 60-130°C, a humidity of 10-50%RH, an anode hydrogen flow rate of 0.1-1L / min, a cathode air flow rate of 0.1-1L / min, an anode back pressure of 0-100kPa (gauge pressure), a cathode back pressure of 0-100 kPa (gauge pressure), and a working electrode voltage range of 0-0.2V.

8. The method according to claim 6, characterized in that The hydrogen leakage current density test conditions include the anode being in a hydrogen atmosphere with a flow rate of 0.07-1L / min, the cathode being in a nitrogen atmosphere with a flow rate of 0.166L-1 / min, the temperature and humidity of the single cell being consistent with the target conditions in the actual power generation process, and the anode and cathode gas back pressure being 0 (gauge pressure).

9. A fuel cell proton exchange membrane accelerated aging test device, characterized in that: The device comprises: A potential control module is used to control the test equipment to perform a potential control cycle treatment on the pre-prepared fuel cell sample under a predetermined aging test condition; wherein, in each round of potential control cycle treatment, the test equipment is controlled to perform an aging cycle operation on the fuel cell sample, and a voltage detection operation is performed on the fuel cell sample after the aging cycle operation; Until the preset number of potential control cycles is reached, the fuel cell sample after the accelerated aging test is obtained.

10. A control device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

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