Membrane electrode activation method, membrane electrode activation device and activated membrane electrode

Abstract

The invention discloses a membrane electrode activation method, a membrane electrode activation device and an activated membrane electrode. The method comprises the following steps: acquiring a membrane electrode to be activated; performing potential scanning on the cathode side of the to-be-activated membrane electrode according to preset scanning parameters so as to form a three-phase effective interface on the surface of a catalyst layer of the to-be-activated membrane electrode; determining an initial stability index of the power generation voltage of the membrane electrode to be activated; under the condition that the initial stability index is smaller than a preset stability threshold value, a preset scanning parameter is adjusted, a target scanning parameter is obtained, and potential scanning is conducted on the cathode side of the to-be-activated membrane electrode according to the target scanning parameter until the target stability index corresponding to the to-be-activated membrane electrode is larger than or equal to the preset stability threshold value; and performing hydrogen pump activation on the to-be-activated membrane electrode after primary activation to obtain a target activated membrane electrode. The technical problem that the activation efficiency is low when the membrane electrode to be activated is activated in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of fuel cells, and more specifically, to a method, apparatus, and activated membrane electrode assembly (MEA). Background Technology

[0002] A proton exchange membrane fuel cell (PEMFC) is a power generation device that directly converts the chemical energy of a fuel source into electrical energy. It boasts high energy conversion efficiency and is environmentally friendly, making it one of the most promising power energy sources. PEMFCs are typically formed by stacking plates and membrane electrode assemblies (MEAs). The MEAs are the core component of the fuel cell and also the main factor affecting its lifespan. The activation process is the initial stage of performance or durability testing, allowing the fuel cell to achieve optimal performance. Appropriate activation methods can enable the cell to reach its maximum output power and achieve reproducible performance.

[0003] Different activation methods have different effects on performance. Currently, the main activation conditions used include constant (variable) current activation, constant (variable) voltage activation, hydrogen pump activation, and cathode starvation activation. Although traditional methods can activate proton exchange membrane fuel cells, the activation speed is slow and the activation time is long, resulting in high efficiency and high cost.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] The present invention provides a membrane electrode activation method, apparatus, and activated membrane electrode to at least solve the technical problem of low activation efficiency when activating the membrane electrode to be activated in the related art.

[0006] According to one aspect of the present invention, a membrane electrode activation method is provided, comprising: obtaining a membrane electrode to be activated; performing a potential scan on the cathode side of the membrane electrode to be activated with predetermined scanning parameters to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated, wherein the predetermined scanning parameters include a potential range parameter, the potential range parameter being a range between a first potential value and a second potential value, the second potential value being a value higher than or equal to 1.2V vs. RHE, i.e., the potential ratio of 1.2V to a standard hydrogen electrode, and less than a predetermined safe potential value; determining an initial stability index of the power generation voltage of the membrane electrode to be activated when a three-phase effective interface is formed on the surface, wherein the initial stability index is determined based on the voltage value at a predetermined current density; adjusting the predetermined scanning parameters to obtain target scanning parameters when the initial stability index is less than a predetermined stability threshold, performing a potential scan on the cathode side of the membrane electrode to be activated with the target scanning parameters until the target stability index corresponding to the membrane electrode to be activated is greater than or equal to the predetermined stability threshold; and performing hydrogen pump activation on the membrane electrode to be activated after one activation when the target stability index is greater than or equal to the predetermined stability threshold to obtain a target activated membrane electrode.

[0007] Optionally, when the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated is subjected to hydrogen pump activation to obtain the target activated membrane electrode, including: when the target stability index is greater than or equal to the predetermined stability threshold, retrieving the pumpable activation parameters corresponding to the membrane electrode to be activated, wherein the pumpable activation parameters include at least one of the following: predetermined temperature, predetermined humidity, predetermined pressure, and predetermined cycle parameters; performing hydrogen pump activation on the membrane electrode to be activated using the pumpable activation parameters to make the activation index of the membrane electrode to be activated reach the highest activity point, wherein the activation index is determined based on the voltage value at a first current density; when the activation index of the membrane electrode to be activated reaches the highest activity point, performing a polarization test on the activated membrane electrode to be activated to obtain a polarization test result; and obtaining the target activated membrane electrode when the polarization test result is that the polarization test passes.

[0008] Optionally, retrieving the pumping activation parameters corresponding to the membrane electrode to be activated includes: obtaining a first test activated membrane electrode, wherein the first test parameter of the first test activated membrane electrode is the same as the membrane electrode parameter of the membrane electrode to be activated after one activation; performing a first test on the first test activated membrane electrode to obtain the pumping activation parameters at the point where the activation index of the first test activated membrane electrode reaches the highest activity point.

[0009] Optionally, before performing a potential scan on the cathode side of the electrode to be activated using predetermined scan parameters, the method further includes: acquiring a second test activated electrode, wherein the second test parameters of the second test activated electrode are the same as the electrode parameters of the electrode to be activated; performing a second test on the second test activated electrode to obtain the potential range parameters and initial scan cycle parameters when the voltage stability index is greater than or equal to the predetermined stability threshold, wherein the voltage stability index is determined based on the voltage value under a second current density; and determining the predetermined scan parameters based on the potential range parameters and the initial scan cycle parameters.

[0010] Optionally, after activating the membrane electrode to be activated by a hydrogen pump to obtain the target activated membrane electrode, the process further includes: preparing the target fuel cell based on the target activated membrane electrode and the bipolar plate.

[0011] Optionally, the potential range parameter is the range between a first potential value and a second potential value, where the second potential value is 1.6V vs. RHE, that is, the potential ratio of 1.6V to that of a standard hydrogen electrode.

[0012] According to one aspect of the present invention, an activated membrane electrode is provided, wherein the activated membrane electrode is activated using any of the membrane electrode activation methods described above.

[0013] According to one aspect of the present invention, a membrane electrode activation apparatus is provided, comprising: a first determining module for acquiring a membrane electrode to be activated, the membrane electrode to be activated including a cathode side of the membrane electrode and a catalyst layer; a scanning module for performing a potential scan on the cathode side of the membrane electrode to be activated with predetermined scanning parameters to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated, wherein the predetermined scanning parameters include a potential range parameter, the potential range parameter being a range between a first potential value and a second potential value, the second potential value being a value higher than or equal to 1.2V vs. RHE and less than a predetermined safe potential value; and a second determining module for determining the surface... When a three-phase effective interface is formed, an initial stability index of the power generation voltage of the membrane electrode to be activated is determined, wherein the initial stability index is determined based on the voltage value under a predetermined current density; an adjustment module is used to adjust the predetermined scanning parameters to obtain target scanning parameters when the stability index is less than a predetermined stability threshold, and to perform a potential scan on the cathode side of the membrane electrode to be activated with the target scanning parameters until the target stability index corresponding to the membrane electrode to be activated is greater than or equal to the predetermined stability threshold; an activation module is used to perform hydrogen pump activation on the membrane electrode to be activated when the target stability index is greater than or equal to the predetermined stability threshold to obtain a target activated membrane electrode.

[0014] According to one aspect of the present invention, an electronic device is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the membrane electrode activation method described in any of the preceding claims.

[0015] According to one aspect of the present invention, a computer-readable storage medium is provided, wherein when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to perform the membrane electrode activation method described in any of the preceding claims.

[0016] In this embodiment of the invention, a membrane electrode to be activated is obtained, comprising a cathode side and a catalyst layer. A potential scan is performed on the cathode side of the membrane electrode to be activated using predetermined scan parameters to form a three-phase effective interface on the surface of the catalyst layer. The predetermined scan parameters include a potential range parameter, which is the range between a first potential value and a second potential value, wherein the second potential value is higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value. With a three-phase effective interface formed on the surface, an initial stability index of the power generation voltage of the membrane electrode to be activated is determined, wherein the initial stability index is determined based on the voltage value at a predetermined current density. If the initial stability index is less than a predetermined stability threshold, the predetermined scan parameters are adjusted to obtain target scan parameters. A potential scan is then performed on the cathode side of the membrane electrode to be activated using the target scan parameters until the target stability index corresponding to the membrane electrode to be activated is greater than or equal to the predetermined stability threshold. If the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated after the first activation is activated by a hydrogen pump to obtain the target activated membrane electrode. It is known that in the process of obtaining the target activated membrane electrode, a potential scan was performed on the cathode side of the membrane electrode using predetermined scan parameters including a higher potential. This enabled the membrane electrode to quickly reach its optimal performance in a short time, improving the activation efficiency and thus solving the technical problem of low activation efficiency when activating the membrane electrode to be activated in related technologies. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a flowchart of a membrane electrode activation method according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of activation comparison provided by an optional embodiment of the present invention;

[0020] Figure 3This is a schematic diagram comparing the polarization performance provided by an optional embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of voltage fluctuation provided by an optional embodiment of the present invention;

[0022] Figure 5 This is a structural block diagram of a membrane electrode activation device according to an embodiment of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] Example 1

[0026] According to an embodiment of the present invention, an embodiment of a membrane electrode activation method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0027] Figure 1 This is a flowchart of a membrane electrode activation method according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0028] Step S102: Obtain the membrane electrode to be activated, which includes the cathode side of the membrane electrode and a catalyst layer;

[0029] In step S102 of this application, a membrane electrode to be activated is obtained. The membrane electrode to be activated is the unactivated membrane electrode. The electrode usually needs to be activated before use to improve its performance and stability. It also ensures that the electrode surface has good electrochemical properties and reactivity to be suitable for various electrochemical analysis and detection applications.

[0030] The area of ​​the electrode to be activated can be set to be smaller than a predetermined area threshold. The predetermined area threshold can be determined based on the testing equipment; for example, it can be set to 300 cm² based on the capabilities of the testing equipment. 2 No specific limitations are set here; adjustments can be made based on the actual equipment used. Determining the area of ​​the electrode membrane to be activated based on the equipment's capabilities makes it easier to achieve efficient catalytic activity and improve electrode performance. Furthermore, a smaller activated membrane area can reduce mass transfer resistance, promote the diffusion and transport of reactants, thereby increasing the reaction rate and achieving better results.

[0031] The membrane electrode to be activated includes a cathode portion and an anode portion, while the membrane electrode with activation includes a diffusion layer, a catalyst layer, and a proton exchange membrane. This application primarily relates to the treatment of the cathode side of the membrane electrode in the cathode portion and the catalyst layer.

[0032] Step S104: Perform a potential scan on the cathode side of the membrane electrode to be activated with predetermined scan parameters to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated. The predetermined scan parameters include potential range parameters, which are the range between a first potential value and a second potential value. The second potential value is higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value.

[0033] In step S104 of this application, the specific process of forming a three-phase effective interface on the surface of the catalyst layer is as follows: a potential scan is performed on the cathode side of the membrane electrode to be activated using predetermined scanning parameters to activate the active sites on the surface of the catalyst layer. This allows reactant molecules, such as hydrogen and oxygen, to adsorb onto the surface of the catalyst layer and interact with it, forming a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated. During the potential scan, the active sites on the surface of the catalyst layer can be activated by adjusting the potential, enabling them to interact with reactant molecules. This interaction typically involves processes such as adsorption, dissociation, and transfer, thereby promoting the electrochemical reaction. The active sites of the catalyst layer refer to special sites that can effectively catalyze the transformation of reactant molecules. By potential scanning, the activity of these active sites can be controlled, thereby improving the reaction rate and selectivity. After reactant molecules are adsorbed onto the surface of the catalyst layer, due to the presence of the catalyst layer, the reactant molecules interact with the catalyst, thereby forming a three-phase effective interface and promoting the reaction.

[0034] The specification describes a potential range parameter within the predetermined scanning parameters. This potential range parameter represents the interval between a first potential value and a second potential value. The second potential value is a relatively high value, such as 1.2V vs. RHE, where vs. RHE represents the potential value compared to a standard hydrogen electrode. That is, 1.2V vs. RHE is the potential ratio of 1.2V to the standard hydrogen electrode. However, the second potential value is also limited to a predetermined safe potential value to avoid membrane electrode rupture or other hazardous phenomena. It should be noted that the membrane electrode used in this embodiment of the invention achieves good performance at the second potential value.

[0035] By limiting the potential range parameters, during one activation process, the potential value can be scanned at a certain rate from the first potential value, gradually increasing until the second potential value is scanned, completing one cycle. Then, according to the number of cycles set in the predetermined scanning parameters, multiple cycles are performed to achieve the effect of one activation.

[0036] The text also describes the effective three-phase interface, which refers to a spatial interface formed on the surface of the catalyst layer containing three bulk phases: gas, liquid, and solid. This interface represents the effective contact between water, gaseous oxygen, and the solid catalyst. The gas is the gas required for the catalytic reaction, the liquid is water, and the solid is the catalyst. At this interface, mass transfer and reaction exchange occur between the gas, liquid, and solid phases, enabling the catalytic reaction in the fuel cell. The formation of this effective three-phase interface is crucial for improving the performance and efficiency of fuel cells.

[0037] It should be noted that when scanning with predetermined parameters, the cathode can be scanned in real time with 100% humidity air and the anode with 100% humidity hydrogen. The water comes from the humidified gas. During the reaction process, water is also generated at the cathode, and some of it will permeate to the anode to form an effective three-phase interface.

[0038] Step S106: When a three-phase effective interface is formed on the surface, determine the initial stability index of the power generation voltage of the electrode to be activated, wherein the initial stability index is determined based on the voltage value under a predetermined current density.

[0039] In step S106 of this application, the initial stability index of the power generation voltage of the membrane electrode to be activated is described when a three-phase effective interface is formed on the surface. When a three-phase effective interface is formed on the surface, the initial stability index of the power generation voltage of the membrane electrode to be activated is generally higher than when no effective interface is formed. This is because a three-phase effective interface can improve the reactivity of the electrode, promote the electrochemical reaction, and thus allow the voltage to reach a stable state more quickly, thereby improving its initial stability index. Furthermore, voltage stabilization can be further achieved through potential scanning.

[0040] The initial stability index can be determined based on the voltage value at a predetermined current density, such as 1.8 A / cm. 2 The voltage value under the voltage density can be used as the initial stability index. If the initial stability index is greater than or equal to a predetermined stability threshold of 0.6V, it is determined to be stable. If the initial stability index is less than the predetermined stability threshold of 0.6V, it is determined to be unstable, and the subsequent steps are performed.

[0041] Step S108: If the initial stability index is less than the predetermined stability threshold, adjust the predetermined scanning parameters to obtain the target scanning parameters, and perform a potential scan on the cathode side of the electrode to be activated using the target scanning parameters until the target stability index corresponding to the electrode to be activated is greater than or equal to the predetermined stability threshold.

[0042] In step S108 provided in this application, the subsequent operation steps when the initial stability index is less than the predetermined stability threshold are described. When the initial stability index is less than the predetermined stability threshold, it means that the power generation voltage of the membrane electrode to be activated is not stable enough. Therefore, it is necessary to adjust the predetermined scanning parameters to obtain the target scanning parameters. The potential is scanned on the cathode side of the membrane electrode to be activated with the target scanning parameters until the stability index corresponding to the membrane electrode to be activated is greater than or equal to the predetermined stability threshold, that is, until the power generation voltage of the membrane electrode to be activated is stable.

[0043] It should be noted that when the voltage generated by the electrode to be activated is unstable, continuing potential scanning can help find a stable operating potential. During potential scanning, the change in electrode potential over time can be observed, which helps to find a suitable potential range for electrode operation. Besides adjusting the potential range, simply increasing the number of scan cycles can also be used. By continuously performing potential scanning, it can be made to operate within a stable voltage range. This improves the stability and reliability of the electrode, thereby ensuring its performance during long-term use.

[0044] Step S110: If the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated after one activation is activated by hydrogen pump to obtain the target activated membrane electrode.

[0045] In step S110 of this application, a hydrogen pump activation is performed on the membrane electrode to be activated after primary activation, provided that the target stability index is greater than or equal to a predetermined stability threshold, to obtain the target activated membrane electrode. This involves hydrogen pump activation, which refers to enhancing the surface activity of the membrane electrode through a specific treatment method before use, thereby improving hydrogen permeability and stability. This increases the hydrogen adsorption and transport efficiency of the membrane electrode, improves the electrode's performance and stability, and thus improves hydrogen production efficiency and quality.

[0046] Through steps S102-S110 above, a membrane electrode to be activated is obtained, comprising a cathode side and a catalyst layer. A potential scan is performed on the cathode side of the membrane electrode to be activated using predetermined scan parameters to form a three-phase effective interface on the surface of the catalyst layer. The predetermined scan parameters include a potential range parameter, which is the range between a first potential value and a second potential value, where the second potential value is higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value. With a three-phase effective interface formed on the surface, an initial stability index of the power generation voltage of the membrane electrode to be activated is determined, wherein the initial stability index is determined based on the voltage value at a predetermined current density. If the initial stability index is less than a predetermined stability threshold, the predetermined scan parameters are adjusted to obtain target scan parameters. A potential scan is then performed on the cathode side of the membrane electrode to be activated using the target scan parameters until the target stability index corresponding to the membrane electrode to be activated is greater than or equal to the predetermined stability threshold. If the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated after the first activation is activated by a hydrogen pump to obtain the target activated membrane electrode. It is known that in the process of obtaining the target activated membrane electrode, a potential scan was performed on the cathode side of the membrane electrode using predetermined scan parameters including a higher potential. This enabled the membrane electrode to quickly reach its optimal performance in a short time, improving the activation efficiency and thus solving the technical problem of low activation efficiency when activating the membrane electrode to be activated in related technologies.

[0047] As an optional embodiment, when the target stability index is greater than or equal to a predetermined stability threshold, hydrogen pump activation is performed on the membrane electrode to be activated to obtain the target activated membrane electrode. This includes: when the target stability index is greater than or equal to the predetermined stability threshold, retrieving the pumpable activation parameters corresponding to the membrane electrode to be activated, wherein the pumpable activation parameters include at least one of the following: predetermined temperature, predetermined humidity, predetermined pressure, and predetermined cycle parameters; performing hydrogen pump activation on the membrane electrode to be activated using the pumpable activation parameters to make the activation index of the membrane electrode to be activated reach the highest activity point, wherein the activation index is determined based on the voltage value at a first current density; when the activation index of the membrane electrode to be activated reaches the highest activity point, performing a polarization test on the activated membrane electrode to be activated to obtain a polarization test result; and obtaining the target activated membrane electrode when the polarization test result is that the polarization test passes.

[0048] This embodiment describes the steps of hydrogen pump activation of the membrane electrode to be activated when the target stability index is greater than or equal to a predetermined stability threshold, to obtain the target activated membrane electrode. In this step, after the target stability index is greater than or equal to the predetermined stability threshold, i.e., after the power generation voltage of the membrane electrode to be activated stabilizes after one activation, the pumpable activation parameters corresponding to the membrane electrode to be activated are retrieved, i.e., the relevant parameters used for pump activation. The membrane electrode to be activated is hydrogen pump activated using the pumpable activation parameters so that the activation index of the membrane electrode to be activated reaches the highest activity point. The activation index of the activated membrane electrode reaching the highest activity point indicates that the activity of the membrane electrode has reached its optimal state, enabling the highest efficiency of electrochemical reactions. This usually means that the active sites on the electrode surface have been fully exposed and utilized, and various electrochemical reactions proceed at the fastest rate. The activation index refers to the degree of activity of the activated membrane electrode, which can usually be determined by electrochemical methods such as cyclic voltammetry or linear sweep voltammetry. These methods can obtain parameters such as the electrochemical active surface area and catalytic activity of the activated membrane electrode to determine the highest activity point.

[0049] When a membrane electrode reaches its peak activity, the electrochemical reaction proceeds with maximum efficiency, thus improving the electrode's catalytic performance and stability. Furthermore, a membrane electrode at its peak activity responds more quickly to external stimuli, enhancing the sensitivity and response speed of the electrochemical sensor. It also exhibits better antioxidant properties, extending its lifespan. Additionally, it can more accurately and selectively catalyze specific chemical reactions, improving selectivity. Moreover, it achieves higher electrochemical activity at lower voltages, reducing energy consumption and cost.

[0050] When the activation index of the membrane electrode to be activated reaches its highest activity point, a polarization test is performed on the activated membrane electrode to obtain the polarization test results. The polarization test measures the polarization behavior of the electrode under a certain current density, specifically observing the change in electrode potential over time at a given current density. Based on the polarization test results, it is determined whether the requirements are met. If the polarization test result is satisfactory, indicating that the requirements are met, the target activated membrane electrode is obtained. This achieves the goal of obtaining a target activated membrane electrode with better performance.

[0051] The pump activation parameters include at least one of the following: predetermined temperature, predetermined humidity, predetermined pressure, and predetermined circulation parameters. For example, the pump activation parameters could be a temperature of 85°C, a humidity of 150%, a hydrogen-air reaction first, and a pressure of 1.8 A / cm². 2 Run for 120 seconds, then reduce to 0.2 A / cm. 2Then switch to hydrogen and nitrogen for the reaction, repeating 11 cycles. The specific settings can be adapted to the actual application and scenario.

[0052] The activation index can be determined using voltage evaluation, for example, the activation index can be determined based on the voltage value at a first current density, such as 1.8 A / cm. 2 Under the given voltage, if the voltage (activation index) is greater than or equal to 0.64, it indicates that the highest activity point has been reached; if it is less than 0.64, it indicates that the highest activity point has not yet been reached. It should be noted that the specific value used to evaluate the activation index can be adjusted according to the actual application and scenario.

[0053] As an optional embodiment, retrieving the pumping activation parameters corresponding to the membrane electrode to be activated includes: obtaining a first test activated membrane electrode, wherein the first test parameters of the first test activated membrane electrode are the same as the membrane electrode parameters of the membrane electrode to be activated after one activation; performing a first test on the first test activated membrane electrode to obtain the pumping activation parameters corresponding to the first test activated membrane electrode when the activation index reaches the highest activity point.

[0054] In this embodiment, the step of obtaining the pump activation parameters corresponding to the membrane electrode to be activated before retrieving the pump activation parameters is described. A first test activated membrane electrode is obtained, wherein the first test parameters of the first test activated membrane electrode are the same as the membrane electrode parameters of the membrane electrode to be activated after one activation, ensuring that the electrodes to be tested are identical. The first test can be a conventional method used for hydrogen pump testing; the key is to measure the parameters that enable the membrane electrode to reach its maximum activity point, which will then be used for subsequent hydrogen pump activation. Thus, the first test activated membrane electrode is subjected to a first test to obtain the pump activation parameters corresponding to the first test activated membrane electrode at the point where the activation index reaches its maximum activity point. In other words, by determining the pump activation parameters through testing, it is ensured that the membrane electrode to be activated after one activation can reach its maximum activity point under these pump activation parameters.

[0055] As an optional embodiment, before performing a potential scan on the cathode side of the electrode to be activated with predetermined scan parameters, the method further includes: acquiring a second test activated electrode, wherein the second test parameters of the second test activated electrode are the same as the electrode parameters of the electrode to be activated; performing a second test on the second test activated electrode to obtain a potential range parameter when the voltage stability index is greater than or equal to a predetermined stability threshold and initial scan cycle parameters, wherein the voltage stability index is determined based on the voltage value under a second current density; and determining predetermined scan parameters based on the potential range parameter and the initial scan cycle parameters.

[0056] In this embodiment, the steps of determining predetermined scanning parameters before performing a potential scan on the cathode side of the membrane electrode to be activated using predetermined scanning parameters are described. First, a second test activated membrane electrode can be obtained, wherein the second test parameters of the second test activated membrane electrode are the same as the membrane electrode parameters of the membrane electrode to be activated, to ensure that the electrodes to be tested are identical. The second test can be a method for testing parameters that stabilize power generation; that is, by changing variables in the initial activation process, i.e., changing certain parameters in the predetermined scanning parameters, it is tested how to set them to achieve voltage stability or faster voltage stabilization, so that subsequent activation can be performed using these parameters to stabilize the power generation voltage corresponding to the membrane electrode to be activated. The second test is performed on the second test activated membrane electrode to obtain the potential range parameters when the voltage stability index is greater than or equal to a predetermined stability threshold, as well as the initial scan cycle parameters. In other words, the potential range parameters and initial scan cycle parameters that can be used to test and obtain stable membrane voltage power generation results are determined. Therefore, the predetermined scanning parameters, including the potential range parameters and the initial scan cycle parameters, ensure that the power generation voltage corresponding to the membrane electrode to be activated is stable when scanning using these predetermined scanning parameters.

[0057] The voltage stability index can be determined based on the voltage value at a predetermined current density, such as 1.8 A / cm. 2 The voltage value under the voltage density can be used as the voltage stability index. If the voltage stability index is greater than or equal to a predetermined stability threshold of 0.6V, it is determined to be stable. If the voltage stability index is less than the predetermined stability threshold of 0.6, it is determined to be unstable, and the operation in the subsequent steps is carried out.

[0058] As an optional embodiment, after the membrane electrode to be activated after one activation is activated by a hydrogen pump to obtain the target activated membrane electrode, the method further includes: preparing the target fuel cell based on the target activated membrane electrode and the bipolar plate.

[0059] This embodiment describes the steps following the hydrogen pump activation of the pre-activated membrane electrode to be activated, resulting in the target activated membrane electrode. After hydrogen pump activation, the target fuel cell can be fabricated based on the target activated membrane electrode and bipolar plates. That is, the target fuel cell is fabricated using the activated target membrane electrode. By using the activated target membrane electrode, the electrocatalytic activity of the electrode can be improved, and the stability of the electrode can be enhanced, extending the lifespan of the fuel cell. The activated membrane electrode can also improve the energy conversion efficiency of the battery, enabling the battery to convert chemical energy into electrical energy more efficiently. Furthermore, the activated membrane electrode can improve the power performance of the battery, giving it a faster response speed and higher power output. Thus, the fabricated target fuel cell possesses the aforementioned beneficial effects.

[0060] As an optional embodiment, the potential range parameter is the range between a first potential value and a second potential value, wherein the second potential value is 1.6V vs. RHE.

[0061] In this embodiment, the potential range parameter is defined as the interval between a first potential value and a second potential value, where the second potential value is 1.6V vs. RHE. For example, the voltage range can be set to 0.07V-1.6V vs. RHE to achieve a better activation effect.

[0062] Based on the above embodiments and optional embodiments, an optional implementation method is provided, which is described in detail below.

[0063] An optional embodiment of the present invention provides a method for activating a membrane electrode, which is described below:

[0064] S1, Obtain the membrane electrode to be activated, which includes the cathode side of the membrane electrode and the catalyst layer;

[0065] S2, a potential scan is performed on the cathode side of the membrane electrode to be activated using predetermined scanning parameters to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated. The predetermined scanning parameters include potential range parameters, which are the range between a first potential value and a second potential value. The second potential value is higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value.

[0066] Specifically, an electrochemical workstation is used to perform a potential scan at a certain rate using a triangular or square wave on the cathode side of the membrane electrode to be activated, with an upper potential limit ≥1.2V vs. RHE. High-potential scanning can activate the active sites of the catalyst, rapidly establish an effective gas-liquid-solid three-phase interface, and enable the membrane electrode to reach optimal performance in a short time, achieving rapid activation.

[0067] Preferably, the voltage scanning range is 0.07V-1.6V vs. RHE, the scanning rate is 100-200mV / s, and the number of scanning cycles is 3-5.

[0068] For example:

[0069] The above steps S1-S2 can be performed using a membrane electrode with an active area of ​​50 cm², a temperature of 40°C, anode and cathode humidity of 100%, anode and cathode pressure of 150 kPa, anode hydrogen gas flow of 0.5 NLM, cathode nitrogen gas flow of 0.2 NLM, Gamry voltage control mode, a voltage range of 0.07V-1.6V vs. RHE, and a scan rate of 175 mV / sec. For example, starting with an initial voltage of 0.07V, the voltage is increased at a rate of 175 mV / sec until it reaches 1.6V vs. RHE, which constitutes one cycle. This cycle is repeated for a total of 5 cycles. That is, during one activation, the specific environmental settings can be set to the above parameters.

[0070] S3, under the condition that a three-phase effective interface is formed on the surface, determine the initial stability index of the power generation voltage of the electrode to be activated.

[0071] S4. If the initial stability index is less than the predetermined stability threshold, adjust the predetermined scanning parameters to obtain the target scanning parameters. Use the target scanning parameters to perform a potential scan on the cathode side of the electrode to be activated until the target stability index corresponding to the electrode to be activated is greater than or equal to the predetermined stability threshold.

[0072] Specifically, conventional hydrogen pump activation can be performed, for example:

[0073] The environmental parameters were set as follows: 75℃, 260kPa / 250kPa back pressure, H2 / Air, 1.8A / cm2, 5min → H2 / Air, 0.2A / cm2, 2min → H2 / N2, 0.2A / cm2, 2min, for 8 cycles.

[0074] S5, when the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated after one activation is activated by hydrogen pump to obtain the target activated membrane electrode.

[0075] Specifically, polarization tests can be performed, for example:

[0076] The environmental parameters were set as follows: 75℃, 260kPa / 250kPa back pressure, 40%RH / 50%RH, and a metering ratio of 2.0 / 2.4.

[0077] It should be noted that, in order to demonstrate the advantages of the method provided by the optional embodiments of the present invention, comparative examples are also provided in the optional embodiments of the present invention, and the comparative examples can be configured as follows:

[0078] A membrane electrode with an active area of ​​50 cm² was selected for conventional hydrogen pump activation.

[0079] The environmental parameters were set as follows: 75℃, 260kPa / 250kPa back pressure, H2 / Air, 1.8A / cm2, 5min → H2 / Air, 0.2A / cm2, 2min → H2 / N2, 0.2A / cm2, 2min, for 11 cycles. The environmental parameters for polarization testing were 75℃, 260kPa / 250kPa back pressure, 40%RH / 50%RH, and a measurement ratio of 2.0 / 2.4.

[0080] By comparing the examples and comparative examples, it can be seen that the optional implementation of the present invention significantly improves the initial activation performance and polarization performance after adding high-potential scanning. At the same time, the total activation time was calculated, and the total time of the examples was 7000s, while the total time of the comparative examples was 10000s, indicating that this method can achieve rapid activation of the membrane electrode and improve the activation efficiency.

[0081] Figure 2 This is a schematic diagram of activation comparison provided by an optional embodiment of the present invention. Figure 3 This is a schematic diagram showing a comparison of polarization performance provided by an optional embodiment of the present invention. Figure 4 This is a schematic diagram of voltage fluctuations provided by an optional embodiment of the present invention, such as... Figure 2 As shown in Figures 3 and 4, it can be seen that the optional embodiments of the present invention can achieve better activation performance and better polarization performance, that is, under the same voltage, the current density can achieve better results and the polarization time is shorter.

[0082] The above optional implementation methods can achieve at least the following beneficial effects:

[0083] (1) In an optional embodiment of the present invention, a high potential is applied to activate the active sites of the catalyst and quickly establish a three-phase interface;

[0084] (2) The optional embodiments of the present invention enable the membrane electrode to reach its optimal performance in a short time, making the performance evaluation of the membrane electrode more objective.

[0085] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0086] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0087] According to another aspect of the present invention, an activated membrane electrode is also provided, which can be activated using any of the membrane electrode activation methods described above. The method includes: the activated membrane electrode is prepared by the following steps: obtaining a membrane electrode to be activated; performing a potential scan on the cathode side of the membrane electrode to be activated using predetermined scanning parameters to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated, wherein the predetermined scanning parameters include potential range parameters, the potential range parameters being the range between a first potential value and a second potential value, the second potential value being a value higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value; determining an initial stability index of the power generation voltage of the membrane electrode to be activated when a three-phase effective interface is formed on the surface, wherein the initial stability index is determined based on the voltage value at a predetermined current density; adjusting the predetermined scanning parameters to obtain target scanning parameters when the initial stability index is less than a predetermined stability threshold, performing a potential scan on the cathode side of the membrane electrode to be activated using the target scanning parameters until the target stability index corresponding to the membrane electrode to be activated is greater than or equal to the predetermined stability threshold; and performing hydrogen pump activation on the membrane electrode to be activated after one activation when the target stability index is greater than or equal to the predetermined stability threshold to obtain the target activated membrane electrode.

[0088] Optionally, when the target stability index is greater than or equal to a predetermined stability threshold, the membrane electrode to be activated is subjected to hydrogen pump activation to obtain the target activated membrane electrode, including: when the target stability index is greater than or equal to the predetermined stability threshold, retrieving the pumping activation parameter corresponding to the membrane electrode to be activated; performing hydrogen pump activation on the membrane electrode to be activated using the pumping activation parameter to make the activation index of the membrane electrode to be activated reach the highest activity point; when the activation index of the membrane electrode to be activated reaches the highest activity point, performing a polarization test on the activated membrane electrode to be activated to obtain the polarization test result; and obtaining the target activated membrane electrode if the polarization test result is that the polarization test passes.

[0089] Optionally, retrieving the pumping activation parameters corresponding to the membrane electrode to be activated includes: obtaining a first test activated membrane electrode, wherein the first test parameters of the first test activated membrane electrode are the same as the membrane electrode parameters of the membrane electrode to be activated after one activation; performing a first test on the first test activated membrane electrode to obtain the pumping activation parameters corresponding to the first test activated membrane electrode when the activation index reaches the highest activity point.

[0090] Optionally, before performing a potential scan on the cathode side of the electrode to be activated with predetermined scan parameters, the method further includes: acquiring a second test activated electrode, wherein the second test parameters of the second test activated electrode are the same as the electrode parameters of the electrode to be activated; performing a second test on the second test activated electrode to obtain a potential range parameter when the voltage stability index is greater than or equal to a predetermined stability threshold and an initial scan cycle parameter; and determining the predetermined scan parameters based on the potential range parameter and the initial scan cycle parameter.

[0091] Optionally, after activating the membrane electrode to be activated by a hydrogen pump to obtain the target activated membrane electrode, the process further includes: preparing the target fuel cell based on the target activated membrane electrode and the bipolar plate.

[0092] Optionally, the potential range parameter is the range between a first potential value and a second potential value, where the second potential value is 1.6V vs. RHE.

[0093] The activated membrane electrode is determined as follows: A membrane electrode to be activated is obtained, comprising a cathode side and a catalyst layer. A potential scan is performed on the cathode side of the membrane electrode to be activated using predetermined scan parameters to form a three-phase effective interface on the surface of the catalyst layer. The predetermined scan parameters include a potential range parameter, which is the range between a first potential value and a second potential value, where the second potential value is higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value. With a three-phase effective interface formed on the surface, an initial stability index of the power generation voltage of the membrane electrode to be activated is determined, where the initial stability index is determined based on the voltage value at a predetermined current density. If the initial stability index is less than a predetermined stability threshold, the predetermined scan parameters are adjusted to obtain target scan parameters. A potential scan is then performed on the cathode side of the membrane electrode to be activated using the target scan parameters until the target stability index corresponding to the membrane electrode to be activated is greater than or equal to the predetermined stability threshold. If the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated after the first activation is activated using a hydrogen pump to obtain the target activated membrane electrode. It is known that in the process of obtaining the target activated membrane electrode, a potential scan was performed on the cathode side of the membrane electrode using predetermined scan parameters including a higher potential. This enabled the membrane electrode to quickly reach its optimal performance in a short time, improving the activation efficiency and thus solving the technical problem of low activation efficiency when activating the membrane electrode to be activated in related technologies.

[0094] According to embodiments of the present invention, an apparatus for implementing the above-described membrane electrode activation method is also provided. Figure 5 This is a structural block diagram of a membrane electrode activation device according to an embodiment of the present invention, such as... Figure 5 As shown, the device includes: a first determining module 502, a scanning module 504, a second determining module 506, an adjusting module 508, and an activation module 510. The device will be described in detail below.

[0095] The first determining module 502 is used to acquire the membrane electrode to be activated; the scanning module 504, connected to the first determining module 502, is used to perform a potential scan on the cathode side of the membrane electrode to be activated with predetermined scanning parameters to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated. The predetermined scanning parameters include a potential range parameter, which is the range between a first potential value and a second potential value. The second potential value is higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value. The second determining module 506, connected to the scanning module 504, is used to determine the membrane electrode to be activated when a three-phase effective interface has been formed on the surface. The initial stability index of the generated voltage is determined based on the voltage value under a predetermined current density; the adjustment module 508, connected to the second determining module 506, is used to adjust the predetermined scanning parameters to obtain the target scanning parameters when the stability index is less than the predetermined stability threshold, and to perform potential scanning on the cathode side of the electrode to be activated with the target scanning parameters until the target stability index corresponding to the electrode to be activated is greater than or equal to the predetermined stability threshold; the activation module 510, connected to the adjustment module 508, is used to perform hydrogen pump activation on the electrode to be activated when the target stability index is greater than or equal to the predetermined stability threshold to obtain the target activated electrode.

[0096] It should be noted that the first determining module 502, the scanning module 504, the second determining module 506, the adjusting module 508, and the activation module 510 mentioned above correspond to steps S102 to S110 in the membrane electrode activation method. The multiple modules and the corresponding steps are the same in terms of examples and application scenarios, but are not limited to the content disclosed in the above embodiment 1.

[0097] According to another aspect of the present invention, an electronic device is also provided, comprising: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute instructions to implement the membrane electrode activation method of any of the above embodiments.

[0098] According to another aspect of the present invention, a computer-readable storage medium is also provided, which, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the membrane electrode activation method described above.

[0099] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0100] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0102] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0103] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0104] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0105] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for activating a membrane electrode, characterized in that, include: Obtain the electrode to be activated; A potential scan is performed on the cathode side of the membrane electrode to be activated using predetermined scanning parameters to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated. The predetermined scanning parameters include a potential range parameter, which is the range between a first potential value and a second potential value. The second potential value is higher than or equal to 1.2V vs. RHE and lower than a predetermined safe potential value. When a three-phase effective interface is formed on the surface, the initial stability index of the power generation voltage of the membrane electrode to be activated is determined, wherein the initial stability index is determined based on the voltage value at a predetermined current density. If the initial stability index is less than the predetermined stability threshold, the predetermined scanning parameters are adjusted to obtain the target scanning parameters. The cathode side of the electrode to be activated is then scanned with the target scanning parameters until the target stability index corresponding to the electrode to be activated is greater than or equal to the predetermined stability threshold. If the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated after one activation is activated by a hydrogen pump to obtain the target activated membrane electrode.

2. The method according to claim 1, characterized in that, When the target stability index is greater than or equal to the predetermined stability threshold, the membrane electrode to be activated is subjected to hydrogen pump activation to obtain the target activated membrane electrode, including: When the target stability index is greater than or equal to the predetermined stability threshold, the pumping activation parameters corresponding to the membrane electrode to be activated are retrieved, wherein the pumping activation parameters include at least one of the following: predetermined temperature, predetermined humidity, predetermined pressure, and predetermined cycle parameters. The membrane electrode to be activated is activated by hydrogen pumping using the pumping activation parameters so that the activation index of the membrane electrode to be activated reaches the highest activity point, wherein the activation index is determined based on the voltage value at a first current density. When the activation index of the membrane electrode to be activated reaches the highest activity point, a polarization test is performed on the activated membrane electrode to be activated to obtain the polarization test results. If the polarization test result is that the polarization test is passed, the target activated film electrode is obtained.

3. The method according to claim 2, characterized in that, Retrieving the pumping activation parameters corresponding to the membrane electrode to be activated includes: Obtain a first test activated membrane electrode, wherein the first test parameter of the first test activated membrane electrode is the same as the membrane electrode parameter of the membrane electrode to be activated after one activation. A first test is performed on the first test activated membrane electrode to obtain the pumping activation parameter at which the activation index of the first test activated membrane electrode reaches the highest activity point.

4. The method according to claim 1, characterized in that, Before performing a potential scan on the cathode side of the electrode to be activated using predetermined scan parameters, the method further includes: Obtain a second test activated membrane electrode, wherein the second test parameter of the second test activated membrane electrode is the same as the membrane electrode parameter of the membrane electrode to be activated; A second test is performed on the second test activation film electrode to obtain the potential range parameters when the voltage stability index is greater than or equal to the predetermined stability threshold and the initial scan cycle parameters, wherein the voltage stability index is determined based on the voltage value under the second current density; The predetermined scan parameters are determined based on the potential range parameters and the initial scan cycle parameters.

5. The method according to claim 1, characterized in that, After performing hydrogen pump activation on the activated membrane electrode to be activated in the first stage to obtain the target activated membrane electrode, the process further includes: Based on the target activated membrane electrode and bipolar plate, the target fuel cell is prepared.

6. The method according to any one of claims 1 to 5, characterized in that, The potential range parameter is the range between the first potential value and the second potential value, where the second potential value is 1.6V vs. RHE.

7. An activated membrane electrode, characterized in that, The activated membrane electrode is activated using the membrane electrode activation method according to any one of claims 1-6.

8. A membrane electrode activation device, characterized in that, include: The first determining module is used to acquire the electrode to be activated membrane; A scanning module is used to perform a potential scan on the cathode side of the membrane electrode to be activated with predetermined scanning parameters, so as to form a three-phase effective interface on the surface of the catalyst layer of the membrane electrode to be activated. The predetermined scanning parameters include potential range parameters, which are the range between a first potential value and a second potential value, wherein the second potential value is higher than or equal to 1.2V vs. RHE and less than a predetermined safe potential value. The second determining module is used to determine the initial stability index of the power generation voltage of the membrane electrode to be activated when a three-phase effective interface is formed on the surface, wherein the initial stability index is determined based on the voltage value at a predetermined current density. The adjustment module is used to adjust the predetermined scanning parameters to obtain target scanning parameters when the stability index is less than a predetermined stability threshold, and to perform potential scanning on the cathode side of the electrode to be activated with the target scanning parameters until the target stability index corresponding to the electrode to be activated is greater than or equal to the predetermined stability threshold. An activation module is used to perform hydrogen pump activation on the membrane electrode to be activated when the target stability index is greater than or equal to the predetermined stability threshold, so as to obtain the target activated membrane electrode.

9. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the membrane electrode activation method as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, When the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to perform the membrane electrode activation method as described in any one of claims 1 to 6.

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