A method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation

Abstract

This invention discloses a method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation. The method includes pretreating a foamed metal substrate; dissolving at least one of an iron salt, cobalt salt, and nickel salt in ultrapure water to obtain an iron / cobalt / nickel salt solution; in-situ growing an iron / cobalt / nickel catalyst precursor on the pretreated metal foam substrate using a hydrothermal method or a combination of hydrothermal and high-temperature calcination; and irradiating the iron / cobalt / nickel catalyst precursor with gamma rays to obtain the oxygen evolution electrocatalyst. The molar ratio of the iron salt, cobalt salt, and nickel salt is x:y:z, where x, y, and z are independently selected from 0 to 1, and x, y, and z are not simultaneously zero. This invention can successfully synthesize iron-cobalt-nickel-based OER electrocatalysts with excellent activity and stability, thereby accelerating the efficiency of water electrolysis. This preparation method has good versatility and provides a new approach for the preparation of non-precious metal OER catalysts.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen production catalyst technology through water electrolysis, specifically relating to a method for preparing a high-performance oxygen evolution electrocatalyst based on gamma ray irradiation. Background Technology

[0002] Hydrogen energy, with its high energy density and zero carbon emissions, is considered a crucial component of future clean energy systems. Water electrolysis, as a primary method for producing green hydrogen, boasts advantages such as mature technology and high product purity. However, the slow kinetics of the oxygen evolution reaction (OER) at the anolyte limit its electrolysis efficiency and large-scale application. Catalysts are typically used to improve the catalytic efficiency of the OER, with ruthenium / iridium-based materials being common choices. However, the high price and limited reserves of these precious metals hinder their application in large-scale electrolysis. Therefore, designing highly active non-precious metal OER electrocatalysts is key to improving the efficiency of water electrolysis for hydrogen production.

[0003] Transition metal iron-cobalt-nickel-based materials (containing at least one element of iron, cobalt, and nickel) have become promising candidate catalysts for oxidation-reduction reactions (OERs) due to their low cost and abundant electronic states. However, the OER performance of pure iron-cobalt-nickel-based materials is often hampered by problems such as poor conductivity and insufficient active sites. Therefore, how to prepare iron-cobalt-nickel-based catalysts with high OER performance remains a hot research topic.

[0004] Oxygen vacancies are the most common type of defect. Introducing oxygen vacancies into the bulk phase of a material can enhance the conductivity of metal oxides, and surface oxygen vacancies can also alter the surface electronic structure and the number of active sites in electrochemical reactions. Based on this mechanism, introducing oxygen defects into iron-cobalt-nickel-based catalysts (containing at least one of iron, cobalt, and nickel) is considered an effective way to further improve their oxygen evolution reaction (OER) catalytic activity. Currently, common methods for constructing oxygen vacancies in iron-cobalt-nickel-based catalysts mainly include sodium borohydride (NaBH4) liquid-phase etching and high-temperature reduction with H2. However, both methods have significant limitations: the high-temperature reduction method with H2 is not suitable for thermally unstable materials; the NaBH4 etching chemical reduction method has limited depth of action, only introducing oxygen vacancies on the oxide surface, thus limiting the improvement of the overall catalyst performance. Therefore, developing a simple, controllable, and easily scalable synthesis method to simultaneously solve the applicability problem of thermally unstable materials and the limitation of reduction depth, and to achieve the preparation of high-performance iron-cobalt-nickel-based OER catalysts, remains an important challenge. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a method for preparing oxygen evolution electrocatalysts based on gamma ray irradiation. This application prepares an iron-cobalt-nickel catalyst precursor by hydrothermal method or hydrothermal method combined with high-temperature calcination. The iron-cobalt-nickel catalyst precursor is then irradiated with gamma rays to obtain a high-performance oxygen evolution electrocatalyst. This preparation method can significantly improve the OER performance of iron-cobalt-nickel-based catalyst materials by introducing gamma rays.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation includes the following steps: Pre-treat the foamed metal substrate; At least one of iron salt, cobalt salt and nickel salt is added to water to obtain an iron / cobalt / nickel salt solution. The iron / cobalt / nickel salt solution is then reacted in situ on a pretreated foam metal substrate to obtain an iron / cobalt / nickel catalyst precursor. A high-performance oxygen evolution electrocatalyst was obtained by irradiating the iron / cobalt / nickel catalyst precursor with gamma rays. The molar ratio of the iron salt, cobalt salt and nickel salt is x : y : z, wherein x, y and z are independently selected from 0 to 1, and x, y and z are not simultaneously zero.

[0007] Furthermore, the foamed metal substrate is either a nickel foam (NF) substrate or an iron foam (IF) substrate.

[0008] Furthermore, the pretreatment method for the foamed metal substrate is as follows: First, the foamed metal is cut into 1×3cm pieces, then ultrasonically treated sequentially with hydrochloric acid, acetone, and deionized water, and finally dried in a vacuum drying oven to obtain the pretreated foamed metal self-supporting substrate. Ultrasonic cleaning can remove the oxide layer and oil stains on the substrate surface, improving the adhesion between the precursor and the substrate.

[0009] Furthermore, the iron salt, cobalt salt, and nickel salt are each selected from at least one of nitrates, sulfates, and chlorides.

[0010] Furthermore, the iron-cobalt-nickel catalyst precursor is any one of iron-cobalt-nickel hydroxide, iron-cobalt-nickel metal-organic framework, or iron-cobalt-nickel oxide.

[0011] Furthermore, the iron / cobalt / nickel hydroxide or iron / cobalt / nickel metal-organic framework is prepared by in-situ reaction of an iron / cobalt / nickel salt solution on a pretreated foam metal substrate via a hydrothermal method; the iron / cobalt / nickel oxide is prepared by first in-situ reaction of an iron / cobalt / nickel salt solution on a pretreated foam metal substrate via a hydrothermal method, and then the product obtained from the in-situ reaction is calcined at high temperature.

[0012] Furthermore, the hydrothermal reaction temperature is 120-140℃, and the reaction time is 10-14h. The temperature range of 120-140℃ represents the optimal range for product crystallization kinetics, structural stability, product purity, and morphology. When the hydrothermal reaction temperature is below 120℃, the crystallization of the hydrothermal reaction product is likely insufficient; when the hydrothermal reaction temperature is above 140℃, the hydrothermal reaction product is prone to structural damage and impurities; when the hydrothermal reaction time is less than 10h, the crystal nuclei of the hydrothermal reaction product have just formed, resulting in insufficient crystallinity, incomplete layered structure growth, disordered interlayer anion arrangement, and irregular morphology, easily leading to amorphous mixed crystals with small particles; when the hydrothermal reaction time is greater than 14h, the crystallization of the hydrothermal reaction product is already completely saturated. Further extending the time will hardly improve the XRD of the product; instead, the particles may overgrow, become larger, and agglomerate, reducing the specific surface area. Additionally, excessively long reaction times will result in energy waste and prolong the experimental cycle.

[0013] Furthermore, the high-temperature calcination conditions are as follows: heating to 300-450℃ at a rate of 1-5℃ / min, and holding at this temperature for 2-4 hours. The temperature range of 300-450℃ represents the optimal range for product structural transformation, specific surface area, crystal phase, and catalytic / electrochemical performance. When the calcination temperature is below 300℃, incomplete reaction is likely; when the calcination temperature is above 450℃, over-sintering begins, causing a sharp decrease in the specific surface area and crystal phase transformation, thus reducing the product's activity. The calcination time is 2-4 hours to ensure complete decomposition and full conversion of the LDH precursor into metal oxides, while avoiding over-sintering that leads to a decrease in specific surface area and activity.

[0014] Furthermore, the gamma-ray irradiation is carried out via Co 60 The radioactive source emits gamma rays, with a radiation rate of 5~10 kGy·h. -1 In the range of 5~10 kGy·h -1 Within the specified rate range, free radical generation and recombination are in equilibrium, resulting in uniform defects and good repeatability. However, when the radiation rate is below 5 kGy·h... -1 At this time, it is easy to introduce secondary defects and structural relaxation into the product; when the radiation rate is higher than 10 kGy·h -1 At this time, local energy concentration can easily cause local overheating and structural damage to the product.

[0015] Furthermore, the gamma ray irradiation dose is adjustable, ranging from 50 to 200 kGy. When the irradiation dose is less than 50 kGy, the product has too few defects, the increase in oxygen vacancy concentration is not significant, and the performance gain is limited. When the irradiation dose is greater than 200 kGy, excessive irradiation leads to lamellar collapse, grain breakage, and structural disorder in the product, resulting in a decrease in performance. Therefore, an irradiation dose of 50–200 kGy can controllably generate oxygen vacancies, preserving the layered structure of the product, maintaining good crystallinity, and having a moderate defect density.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) Compared with the existing technology of constructing oxygen vacancies in iron / cobalt / nickel-based catalysts by liquid phase etching of sodium borohydride or high-temperature reduction of hydrogen, the present invention uses an iron / cobalt / nickel salt solution to carry out an in-situ reaction on a pretreated foam metal substrate to obtain an iron / cobalt / nickel catalyst precursor. Then, the iron / cobalt / nickel catalyst precursor is irradiated with gamma rays to obtain a high-performance oxygen evolution electrocatalyst. This preparation method can overcome the technical bottlenecks of traditional methods, such as limited action depth, inapplicability to thermally unstable materials, high energy consumption, and increased economic costs. In particular, in the molar ratio of iron salt, cobalt salt, and nickel salt x:y:z, x, y, and z are independently selected from 0 to 1 and are not simultaneously zero. By precisely controlling the ratio of the three, the generation efficiency and distribution uniformity of oxygen vacancies during irradiation can be synergistically optimized, so that oxygen vacancies are not limited to the surface but can be controllably constructed in the bulk phase of the material, thereby significantly improving the oxygen evolution reaction performance of iron / cobalt / nickel-based catalyst materials and accelerating the working efficiency of water electrolysis.

[0017] (2) The catalyst prepared by the present invention has a self-supporting structure, good conductivity and mechanical stability, and can be used directly as an electrode, which simplifies the electrode preparation process. Moreover, the method is applicable to a variety of transition metal systems, with good universality and scalability, providing a new idea for the design and preparation of high-performance non-noble metal OER catalysts. Attached Figure Description

[0018] Figure 1 This is a SEM image of the catalyst prepared in Example 1 of the present invention.

[0019] Figure 2 The image shows the XRD pattern of the catalyst prepared in Example 1 of this invention.

[0020] Figure 3 This is a SEM image of the catalyst prepared in Example 2 of the present invention.

[0021] Figure 4 The image shows the XRD pattern of the catalyst prepared in Example 2 of this invention.

[0022] Figure 5This is a SEM image of the catalyst prepared in Example 3 of the present invention.

[0023] Figure 6 The image shows the XRD pattern of the catalyst prepared in Example 3 of this invention.

[0024] Figure 7 This is a SEM image of the catalyst prepared in Comparative Example 1 of this invention.

[0025] Figure 8 The image shows the XRD pattern of the catalyst prepared in Comparative Example 1 of this invention.

[0026] Figure 9 This is a SEM image of the catalyst prepared in Comparative Example 2 of this invention.

[0027] Figure 10 The image shows the XRD pattern of the catalyst prepared in Comparative Example 2 of this invention.

[0028] Figure 11 This is a SEM image of the catalyst prepared in Comparative Example 3 of this invention.

[0029] Figure 12 The image shows the XRD pattern of the catalyst prepared in Comparative Example 3 of this invention.

[0030] Figure 13 The above are electrochemical polarization curves of the catalysts prepared in Example 1 and Comparative Example 1 of this invention in a three-electrode reaction cell with 1M KOH electrolyte.

[0031] Figure 14 The above are electrochemical polarization curves of the catalysts prepared in Example 2 and Comparative Example 2 of this invention in a three-electrode reaction cell with 1M KOH electrolyte.

[0032] Figure 15 The catalysts prepared in Example 3 and Comparative Example 3 of this invention were reacted in a three-electrode reactor with 1M KOH. Electrochemical polarization curves in electrolytes. Detailed Implementation

[0033] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0034] Unless otherwise specified, all reagents used in this invention are commercially available, and all methods used are conventional techniques in the art.

[0035] Example 1 A method for preparing oxygen evolution electrocatalysts based on gamma ray irradiation includes the following steps: (1) Pretreatment of nickel foam self-supporting substrate: cut nickel foam into 1×2cm size, and ultrasonically treat it in 3M HCl for 20min, ultrasonically treat it in acetone for 20min, ultrasonically treat it in deionized water for 10min in sequence, and finally place it in a vacuum drying oven at 60℃ for 6h to obtain the pretreated nickel foam self-supporting substrate. (2) Preparation of mixed salt solution: Dissolve 0.01 mmol Co(NO3)2·6H2O, 0.02 mmol NH4F and 0.10 mmol CO(NH2)2 in 80 mL of deionized water and stir magnetically for 30 min to form a homogeneous mixed solution; (3) Hydrothermal reaction: The mixed solution obtained in step (2) is transferred to a 100 mL polytetrafluoroethylene reactor, and the treated nickel foam self-supporting substrate obtained in step (1) is added to it. After sealing, it is placed in an oven and hydrothermally reacted at 120 °C for 12 h. (4) High temperature calcination: Take out the foamed nickel after the reaction in step (3), wash it three times with deionized water, dry it at 60°C and place it in a muffle furnace. In an air atmosphere, heat it to 350°C at 2°C / min, keep it at the temperature for 3 hours, and then cool it naturally to obtain Co3O4 self-supporting material. (5) Gamma ray irradiation: The Co3O4 self-supporting material obtained in step (4) was placed in a glass bottle containing deionized water, and then the glass bottle containing the Co3O4 self-supporting material was irradiated in a gamma irradiation device at a radiation rate of 7.5 kGy·h. -1 With an irradiation dose of 100 kGy, a high-performance oxygen evolution electrocatalyst, namely Co3O4-100 kGy, was obtained.

[0036] The SEM and XRD patterns of the high-performance oxygen evolution electrocatalyst Co3O4-40kGy obtained in this embodiment are shown in the figures below. Figure 1 and Figure 2 As shown. From Figure 1 The SEM images show that the catalyst Co3O4-100 kGy prepared in this example is uniformly distributed on the nickel foam, forming an upright, dense, and ordered array of nanoneedles. The SEM images are compared with those of the catalyst prepared in Comparative Example 1. Figure 7 Compared to the previous observation, the tip fractured and the surface became rougher, indicating that irradiation affected the morphology. From... Figure 2 The XDR spectrum shows that the XRD pattern of the catalyst Co3O4-100 kGy prepared in this example matches the standard card for Co3O4, indicating that the prepared material is Co3O4. The XRD pattern is compared with that of the catalyst prepared in Comparative Example 1. Figure 8 Compared to the previous example, the position and intensity of the peaks remained basically unchanged, indicating that the irradiation did not affect the crystal phase of the catalyst.

[0037] Example 2 A method for preparing oxygen evolution electrocatalysts based on gamma ray irradiation includes the following steps: (1) Pretreatment of foamed iron self-supporting substrate: cut foamed iron into 1×2cm size, and sonicate it in 3 M HCl for 20min, sonicate it in acetone for 20min, sonicate it in deionized water for 10min in sequence, and finally place it in a vacuum drying oven at 60℃ for 6h to obtain pretreated foamed iron self-supporting substrate. (2) Preparation of mixed salt solution: Dissolve 6 mmol NiCl2·6H2O and 2 mmol FeCl3·6H2O in 40 mL of deionized water, then add 24 mmol CO(NH2)2 and stir magnetically for 30 min to form a homogeneous mixed solution; (3) Hydrothermal reaction: The mixed solution obtained in step (2) was transferred to a 50 mL polytetrafluoroethylene reactor, and the treated foamed iron self-supporting substrate obtained in step (1) was added to it. After sealing, it was placed in an oven and reacted at 120 °C for 12 h. Then the foamed iron after reaction was taken out, washed 3 times with deionized water and 2 times with anhydrous ethanol, and dried in a vacuum drying oven at 60 °C for 6 h to obtain FeNi LDH catalyst precursor. (4) Gamma ray irradiation: The FeNi LDH catalyst precursor obtained in step (3) was placed in a glass bottle containing deionized water, and then the glass bottle containing the FeNi LDH catalyst precursor was irradiated in a gamma irradiation device at a radiation rate of 7.5 kGy·h. -1 With an irradiation dose of 100 kGy, a high-performance oxygen evolution electrocatalyst, namely FeNi LDH-100 kGy, was obtained.

[0038] The SEM and XRD patterns of the high-performance oxygen evolution electrocatalyst FeNi LDH-100kGy obtained in this embodiment are shown in the figures below. Figure 3 and Figure 4 As shown. From Figure 3 The SEM images show that the FeNi LDH-100 kGy catalyst prepared in this embodiment exhibits a highly ordered array arrangement on nickel foam and displays a nanosheet morphology. The SEM images of the catalyst prepared in Comparative Example 2 are compared. Figure 9 Compared to the original, the nanosheets had a slightly rougher surface, indicating that irradiation affected the morphology. From... Figure 4 As can be seen from the XDR spectrum, the XRD pattern of the FeNi LDH-100kGy catalyst prepared in this embodiment matches the standard card of FeNi LDH, indicating that FeNi LDH was successfully synthesized. The XRD pattern is compared with that of the catalyst prepared in Comparative Example 2. Figure 10 Compared to the previous example, the position and intensity of the peaks remained basically unchanged, indicating that the irradiation did not affect the crystal phase of the catalyst.

[0039] Example 3 A method for preparing oxygen evolution electrocatalysts based on gamma ray irradiation includes the following steps: (1) Pretreatment of nickel foam self-supporting substrate: cut the foam iron into 1×2 cm size, and then sonicate it in 3 M HCl for 20 min, sonicate it in acetone for 20 min, sonicate it in deionized water for 10 min, and finally place it in a vacuum drying oven at 60℃ for 6 h to obtain the pretreated nickel foam self-supporting substrate. (2) Preparation of mixed salt solution: Sonicate terephthalic acid with dimethylformamide, deionized water, hydrochloric acid and ethanol for 30 min to form a homogeneous mixed solution; (3) Hydrothermal reaction: The mixed solution obtained in step (2) was transferred to a 50 mL polytetrafluoroethylene reactor, and the treated nickel foam self-supporting substrate obtained in step (1) was added to it. After sealing, it was placed in an oven and reacted at 140 °C for 12 h. Then the reacted nickel foam was taken out, washed three times with deionized water, and dried in a vacuum drying oven at 60 °C for 6 h to obtain the Ni MOF catalyst precursor. (4) Gamma ray irradiation: The Ni MOF catalyst precursor obtained in step (3) was placed in a glass bottle containing deionized water, and then the glass bottle containing the Ni MOF catalyst precursor was irradiated in a gamma irradiation device at a radiation rate of 7.5 kGy·h. -1 A high-performance oxygen evolution electrocatalyst (labeled as Ni MOF-100kGy) was obtained by irradiation with a dose of 100kGy.

[0040] The SEM and XRD patterns of the high-performance oxygen evolution electrocatalyst Ni MOF-100kGy obtained in this embodiment are shown in the figures below. Figure 5 and Figure 6 As shown. From Figure 5 As can be seen from the SEM images, the catalyst prepared in this embodiment...

[0041] Ni MOF-100kGy exhibits an ultrathin nanosheet structure on nickel foam, with the nanosheets interlacing and growing vertically to form a layered array structure. (SEM image of the catalyst prepared in Comparative Example 3 is also shown.) Figure 11 Compared to other materials, nanosheets have a rougher surface and exhibit some aggregation and stacking, indicating that irradiation affected their morphology. From... Figure 6 The XRD pattern in the image shows that the XRD pattern of the Ni MOF-100kGy catalyst prepared in this embodiment matches the simulated Ni MOF card, indicating that the prepared composite material is pure Ni MOF. The XRD pattern is compared with that of the catalyst prepared in Comparative Example 3. Figure 12Compared to the previous example, the position and intensity of the peaks remained basically unchanged, indicating that the irradiation did not affect the crystal phase of the catalyst.

[0042] Comparative Example 1 The only difference between Comparative Example 1 and Example 1 is that the obtained Co3O4 self-supporting material was not irradiated with gamma rays, and the catalyst obtained was Co3O4; the rest is the same as in Example 1.

[0043] Comparative Example 2 The only difference between this comparative example and Example 2 is that the FeNi LDH catalyst precursor obtained was not irradiated with gamma rays, and the resulting catalyst was FeNi LDH; otherwise, it is the same as Example 2.

[0044] Comparative Example 3 The only difference between this comparative example and Example 3 is that the obtained Ni MOF catalyst precursor was not irradiated with gamma rays, and the resulting catalyst was Ni MOF; otherwise, it is the same as Example 3.

[0045] Effect Analysis The electrochemical performance of the products obtained in Examples 1-3 and Comparative Examples 1-3 was tested. Specifically, a three-electrode system was used for evaluation. The electrolyte was a 1M KOH solution, and the working electrode was a glassy carbon electrode with a diameter of 3 mm on which the catalysts obtained in Examples 1-3 and Comparative Examples 1-3 were uniformly loaded. The catalyst loading was controlled at 0.2 mg·cm³. −2 The reference electrode was a mercury oxide electrode, and the counter electrode was a carbon rod; all test potentials were converted to potentials relative to the reversible hydrogen electrode (RHE). The electrolyte was first purged with nitrogen to remove dissolved oxygen, followed by linear sweep voltammetry at a scan rate of 5 mV / s, with a potential range of 1.2–1.8 V (vs. RHE). The test results are as follows: Figures 13-15 As shown. From Figures 13-15 It can be seen that the OER performance of the catalysts prepared by gamma irradiation in Examples 1-3 is better than that of the catalysts prepared without gamma irradiation in Comparative Examples 1-3, indicating that gamma irradiation is an effective method to improve the OER performance of iron-cobalt-nickel oxygen evolution electrocatalysts, and this method has universality.

[0046] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described in this invention to avoid redundancy. Although preferred embodiments of this invention have been described, those skilled in the art, once they understand the inventive concept of this invention, can make other changes and modifications to these embodiments, and all such changes and modifications fall within the scope of this invention.

[0047] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. If such modifications and variations fall within the scope of equivalents of this invention, then this invention also intends to include these modifications and variations.

Claims

1. A method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation, characterized in that, Includes the following steps: Pre-treat the foamed metal substrate; At least one of iron salt, cobalt salt and nickel salt is dissolved in deionized water to obtain an iron / cobalt / nickel salt solution. The iron / cobalt / nickel salt solution is then reacted in situ on a pretreated foam metal substrate to obtain an iron / cobalt / nickel catalyst precursor. A high-performance oxygen evolution electrocatalyst was obtained by irradiating the iron / cobalt / nickel catalyst precursor with gamma rays. The molar ratio of the iron salt, cobalt salt and nickel salt is x : y : z, wherein x, y and z are independently selected from 0 to 1, and x, y and z are not simultaneously zero.

2. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 1, characterized in that... The foamed metal substrate is either a nickel foam substrate or an iron foam substrate.

3. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 1, characterized in that, The specific method for pretreating the foamed metal substrate is as follows: First, the foamed metal is cut into 1×3cm pieces, then ultrasonically treated in hydrochloric acid, acetone, and deionized water in sequence, and finally dried in a vacuum drying oven to obtain the pretreated foamed metal self-supporting substrate.

4. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 1, characterized in that, The iron salt, cobalt salt, and nickel salt are each selected from at least one of nitrates, sulfates, and chlorides.

5. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 1, characterized in that, The iron / cobalt / nickel catalyst precursor is any one of iron / cobalt / nickel hydroxide, iron / cobalt / nickel metal-organic framework, or iron / cobalt / nickel oxide.

6. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 5, characterized in that, The iron / cobalt / nickel hydroxide or iron / cobalt / nickel metal-organic framework is prepared by in-situ reaction of iron / cobalt / nickel salt solution on a pretreated foam metal substrate via hydrothermal method; the iron / cobalt / nickel oxide is prepared by in-situ reaction of iron / cobalt / nickel salt solution on a pretreated foam metal substrate via hydrothermal method, and the product obtained from the in-situ reaction is then prepared by high-temperature calcination.

7. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 6, characterized in that, The hydrothermal reaction temperature is 120~140℃, and the reaction time is 10~14h.

8. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 6, characterized in that, The conditions for high-temperature calcination are to raise the temperature to 300-450°C at a heating rate of 1-5°C / min and then hold the temperature for 2-4 hours.

9. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 1, characterized in that, The gamma irradiation was passed through Co 60 The radioactive source emits gamma rays, with a radiation rate of 5~10 kGy·h. -1 .

10. The method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation according to claim 1, characterized in that, The gamma ray irradiation dose ranges from 50 to 200 kGy.

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