Seawater-corrosion-resistant oxygen evolution catalyst as well as preparation method and application thereof

Abstract

The invention relates to the technical field of catalytic materials, in particular to a seawater-corrosion-resistant oxygen evolution catalyst and a preparation method and application thereof.The seawater-corrosion-resistant oxygen evolution catalyst comprises a metal carrier and a metal oxide layer covering the surface of the metal carrier; the precious metal oxide and / or the multi-element precious metal oxide are / is loaded on the surface of the metal oxide layer; metal oxides in the metal oxide layer may form metallate anions in an aqueous medium. The metal oxide layer loaded on the surface of the metal carrier can form a stable heterostructure with the noble metal oxide and / or the multi-element noble metal oxide, so that the oxidation precipitation of the noble metal can be inhibited to a certain extent, and meanwhile, the electronic structure of the noble metal oxide and / or the multi-element noble metal oxide at the active center can be regulated and controlled; therefore, the catalyst has higher catalytic activity and higher stability. In addition, the metal oxide layer has strong seawater corrosion resistance, and can play a certain role in protecting the metal carrier.

Description

Technical Field

[0001] The present invention relates to the technical field of catalytic materials, and in particular to an oxygen evolution catalyst resistant to seawater corrosion, a preparation method thereof, and an application thereof. Background Art

[0002] Existing studies have shown that by covering a layer of selectively permeable MnO film on the surface of a noble metal catalyst, the occurrence of CER competitive reactions can be inhibited. However, the presence of the protective layer is not conducive to the direct contact between the reactants and the catalyst, which inhibits the catalytic activity. In addition, researchers have formed negatively charged acid root anions on the surface of the catalyst and used Coulomb repulsion to repel chloride ions that also carry negative charges, inhibiting the occurrence of CER competitive reactions and avoiding the corrosion of the catalyst. However, this technology ignores the improvement of the catalyst performance, and the problem of chlorine corrosion of the metal substrate has not been solved.

[0003] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] In view of the above deficiencies of the existing technology, the purpose of the present invention is to provide an oxygen evolution catalyst resistant to seawater corrosion, a preparation method thereof, and an application thereof, aiming to solve the problems of poor corrosion resistance and low catalytic performance of the existing catalyst.

[0005] The technical solution of the present invention is as follows:

[0006] An oxygen evolution catalyst resistant to seawater corrosion, comprising a metal carrier, a metal oxide layer covering the surface of the metal carrier, and a noble metal oxide and / or a multi-noble metal oxide supported on the surface of the metal oxide layer; the metal oxide in the metal oxide layer can form metal acid root anions in an aqueous medium.

[0007] The oxygen evolution catalyst resistant to seawater corrosion, wherein the metal carrier includes one of nickel foam, copper foam, titanium felt, and cobalt foam.

[0008] The oxygen evolution catalyst resistant to seawater corrosion, wherein the material of the metal oxide layer includes one or more of Cr2O3, CeO2, V2O5, and SnO2; the noble metal oxide includes one or more of RuO2 and IrO2; the multi-noble metal oxide includes Ru x Ir 1-x O2, where x is 0-1.

[0009] The oxygen evolution catalyst resistant to seawater corrosion, wherein the thickness of the metal oxide layer is 0.5 μm - 5 μm; the loading amount of the noble metal oxide and / or the multi-noble metal oxide in the oxygen evolution catalyst resistant to seawater corrosion is 0.5 wt% - 10 wt%.

[0010] A preparation method of a seawater corrosion-resistant oxygen evolution catalyst, comprising the steps:

[0011] Mix a metal salt, an alkaline precipitating agent and a solvent to obtain a first solution;

[0012] Mix a metal support with the first solution, and after a first hydrothermal reaction, perform a first annealing treatment to obtain a precursor material with a self-supporting structure;

[0013] Mix at least one noble metal salt with a solvent to obtain a second solution;

[0014] Mix the precursor material with the second solution, and after a second hydrothermal reaction, perform a second annealing treatment to obtain a seawater corrosion-resistant oxygen evolution catalyst.

[0015] The preparation method of the seawater corrosion-resistant oxygen evolution catalyst, wherein the metal salt includes one or more of chromium salt, cerium salt, vanadium salt, tin salt; and / or the noble metal salt includes one or more of ruthenium salt, iridium salt.

[0016] The preparation method of the seawater corrosion-resistant oxygen evolution catalyst, wherein the alkaline precipitating agent includes one or more of urea, ammonia water, sodium hydroxide, hexamethylenetetramine, ammonium carbonate, sodium carbonate, ammonium bicarbonate.

[0017] The preparation method of the seawater corrosion-resistant oxygen evolution catalyst, wherein the temperature of the first hydrothermal reaction is 100°C - 200°C, and the time of the first hydrothermal reaction is 1h - 10h; and / or the temperature of the first annealing treatment is 300°C - 500°C, the time of the first annealing treatment is 1h - 3h, and the heating rate of the first annealing treatment is 2°C / min - 5°C / min.

[0018] The preparation method of the seawater corrosion-resistant oxygen evolution catalyst, wherein the temperature of the second annealing treatment is 300°C - 500°C, the time of the second annealing treatment is 2h - 6h, and the heating rate of the second annealing treatment is 2°C / min - 5°C / min.

[0019] An application of a seawater corrosion-resistant oxygen evolution catalyst in electrolyzing seawater to produce hydrogen.

[0020] Beneficial effects: The present invention provides a seawater corrosion-resistant oxygen evolution catalyst, a preparation method thereof, and an application thereof. The seawater corrosion-resistant oxygen evolution catalyst includes a metal support, a metal oxide layer covering the surface of the metal support, and a noble metal oxide and / or a multi-noble metal oxide supported on the surface of the metal oxide layer; the metal oxide in the metal oxide layer can form metal acid root anions. The metal oxide layer supported on the surface of the metal support in the present invention can form a stable heterostructure with the noble metal oxide and / or the multi-noble metal oxide, which can inhibit the oxidation and precipitation of the noble metal to a certain extent, and at the same time can regulate the electronic structure of the active center noble metal oxide and / or the multi-noble metal oxide, making it have higher catalytic activity and stronger stability. Moreover, the metal oxide layer has strong seawater corrosion resistance and can play a certain protective role for the metal support. At the same time, the metal oxide layer can optimize the adsorption energy of the noble metal for Cl, reduce the adsorption of Cl, and inhibit the occurrence of the chlorine evolution reaction (CER) by forming metal acid root anions and electrostatically repelling Cl - , thereby improving the overall durability of the catalyst in a seawater medium. In addition, the synthesis process of this catalyst is simple, economical and can be prepared on a large scale, and the prepared catalyst has both excellent electrocatalytic activity and seawater electrolysis stability. Description of the Drawings

[0021] Figure 1 is a process flow schematic diagram of a preparation method of a seawater corrosion-resistant oxygen evolution catalyst of the present invention;

[0022] Figure 2 is an XRD pattern of the RuO2 / Cr2O3 / NF catalyst prepared in Example 1;

[0023] Figure 3 is a scanning electron microscope image of the RuO2 / Cr2O3 / NF catalyst prepared in Example 1;

[0024] Figure 4 is a linear sweep polarization curve test data graph of the RuO2 / Cr2O3 / NF catalyst prepared in Example 1 as a working electrode;

[0025] Figure 5 is a large current stability test data graph of the RuO2 / Cr2O3 / NF catalyst prepared in Example 1 as a working electrode in alkaline seawater. Detailed Embodiments

[0026] The present invention provides a seawater corrosion-resistant oxygen evolution catalyst, a preparation method thereof, and an application thereof. To make the purpose, technical solution and effects of the present invention clearer and more definite, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the technical field to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as here.

[0028] Currently, the excessive use of fossil fuels has triggered an increasingly serious greenhouse effect. In contrast, hydrogen is hailed as an ideal "green energy" due to its high energy density and the characteristic of no carbon emissions during the combustion process. However, the vast majority of hydrogen currently in use is grey hydrogen or blue hydrogen, which still produces carbon emissions during the production process. Green hydrogen produced by driving water electrolysis through renewable energy sources such as solar energy and wind energy is considered a more feasible energy carrier. However, commercial water electrolysis for hydrogen production has high requirements for the purity of water, while fresh water resources only account for 3.5% of the earth's water resources reserves, which is not conducive to the development of the green hydrogen industry in coastal cities lacking fresh water. If hydrogen can be produced by electrolyzing seawater and effectively coupled with the abundant renewable energy in the ocean, such as wind energy, solar energy, and tidal energy, it will help to further reduce the cost of hydrogen production and promote the sustainable development of the green hydrogen industry.

[0029] Direct electrolysis of seawater, as a promising hydrogen production technology, does not require pre-seawater desalination and purification treatment, and has lower infrastructure and capital requirements. However, the complex composition of seawater poses a major challenge to the development of efficient seawater electrolysis hydrogen production technology. For example, a large amount of chloride ions in seawater are prone to competing reactions with the oxygen evolution reaction (OER) and are prone to causing electrode corrosion. Therefore, the development of low-cost, highly selective, and stable OER electrocatalysts is crucial for promoting the development of industrial seawater electrolysis hydrogen production technology.

[0030] Based on this, the present invention provides an oxygen evolution catalyst resistant to seawater corrosion, including a metal carrier, a metal oxide layer covering the surface of the metal carrier, and a noble metal oxide and / or a multi-noble metal oxide supported on the surface of the metal oxide layer; the metal oxide in the metal oxide layer can form metal acid root anions in an aqueous medium.

[0031] In this embodiment, the metal oxide layer loaded on the surface of the metal support can form a stable heterostructure with noble metal oxides and / or multiple noble metal oxides, which can inhibit the oxidation and precipitation of noble metals to a certain extent. At the same time, the electronic structure of the active center noble metal oxides and / or multiple noble metal oxides can be regulated to endow them with higher catalytic activity and stronger stability. Moreover, the metal oxide layer has strong seawater corrosion resistance and can play a certain protective role for the metal support. Meanwhile, the metal oxide layer can optimize the adsorption energy of noble metals for Cl, reduce the adsorption of Cl, and electrostatically repel Cl by forming metal acid root anions - , thereby inhibiting the occurrence of the chlorine evolution reaction (CER), and improving the overall durability of the catalyst in the seawater medium. In addition, the synthesis process of this catalyst is simple, economical and can be prepared on a large scale. The prepared catalyst has both excellent electrocatalytic activity and seawater electrolysis stability.

[0032] Specifically, due to the heterostructure, the seawater corrosion-resistant oxygen evolution catalyst improves the catalytic activity of noble metal oxides and / or multiple noble metal oxides and inhibits the dissolution of noble metal atoms in noble metal oxides and / or multiple noble metal oxides. Moreover, a metal oxide layer is covered on the surface of the metal support, making the self-supported structure catalyst corrosion-resistant during the electrolysis of seawater and showing excellent OER electrocatalytic activity and stability.

[0033] In some embodiments, the metal support includes one of nickel foam, copper foam, titanium felt, and cobalt foam. The above-mentioned metal supports have a high specific surface area, can provide more loading sites, and improve the catalytic performance of the catalyst.

[0034] In a preferred embodiment, the metal support is nickel foam.

[0035] In some embodiments, the material of the metal oxide layer includes one or more of Cr2O3, CeO2, V2O5, and SnO2. The metal oxide layer of this material can form a stable heterostructure with noble metal oxides and / or multiple noble metal oxides loaded on its surface, inhibit the oxidation and precipitation of noble metals to a certain extent, and at the same time can regulate the electronic structure of the active center noble metal oxides and / or multiple noble metal oxides to endow them with higher catalytic activity and stronger stability. Moreover, the above-mentioned metal oxide layer has strong seawater corrosion resistance and can play a certain protective role for the metal support. Meanwhile, the metal oxide layer can optimize the adsorption energy of noble metals for Cl, reduce the adsorption of Cl, and electrostatically repel Cl by forming metal acid root anions - , thereby inhibiting the occurrence of CER and improving the overall durability of the catalyst in the seawater medium.

[0036] In some embodiments, the noble metal oxide includes one or more of RuO2 and IrO2; the multiple noble metal oxide is Ru x Ir 1-x O2, where x ranges from 0 to 1. The above noble metal oxide and / or multiple noble metal oxide in the heterostructure can further enhance its catalytic activity and the dissolution of the noble metal can be inhibited by the heterostructure. x can move within the range of 0 to 1, and each specific value can represent a specific catalyst.

[0037] In a preferred embodiment, the noble metal oxide is RuO2, and a single RuO2 is supported on the surface of the metal oxide layer.

[0038] In some embodiments, the thickness of the metal oxide layer is 0.5 μm - 5 μm; the loading amount of the noble metal oxide and / or multiple noble metal oxide in the seawater corrosion-resistant oxygen evolution catalyst is 0.5 wt% - 10 wt%. The metal oxide layer with this thickness has strong seawater corrosion resistance and can protect the metal support. Controlling the loading amount of the noble metal oxide and / or multiple noble metal oxide within the above range can improve the catalytic activity of the catalyst.

[0039] In addition, as Figure 1 shown, the present invention also provides a preparation method of a seawater corrosion-resistant oxygen evolution catalyst, including the steps:

[0040] Step S10: Mix a metal salt, an alkaline precipitant and a solvent to obtain a first solution;

[0041] Step S20: Mix the metal support with the first solution, and after a first hydrothermal reaction, perform a first annealing treatment to obtain a precursor material with a self-supporting structure;

[0042] Step S30: Mix at least one noble metal salt with a solvent to obtain a second solution;

[0043] Step S40: Mix the precursor material with the second solution, and after a second hydrothermal reaction, perform a second annealing treatment to obtain a seawater corrosion-resistant oxygen evolution catalyst.

[0044] In this embodiment, a metal oxide layer is grown on a metal support (MS) at room temperature by a simple hydrothermal method and an annealing method to obtain a precursor material with a self-supporting structure; then, a noble metal ion source and the precursor material with a self-supporting structure are placed in a reaction kettle and reacted by a hydrothermal method, and then annealed to prepare an oxygen evolution catalyst resistant to seawater corrosion with noble metal oxide and / or multi-component noble metal oxide loaded on the surface of the metal oxide layer. The synthesis process of this catalyst is simple, economical and can be prepared on a large scale; moreover, due to the heterogeneous structure of the constructed catalyst, the catalytic activity of the noble metal oxide and / or multi-component noble metal oxide is enhanced, and the dissolution of noble metals is inhibited; at the same time, the prepared catalyst with a self-supporting structure is corrosion-resistant during the electrolysis of seawater, showing excellent OER electrocatalytic activity and stability.

[0045] Specifically, by using the above preparation method, a metal oxide layer loaded on the surface of a metal support can form a stable heterogeneous structure with noble metal oxide and / or multi-component noble metal oxide, which can, to a certain extent, inhibit the oxidation and precipitation of noble metals, and at the same time, can regulate the electronic structure of the active center noble metal oxide and / or multi-component noble metal oxide, making it have higher catalytic activity and stronger stability. Moreover, the metal oxide layer has strong seawater corrosion resistance and can play a certain protective role for the metal support. At the same time, the metal oxide layer can optimize the adsorption energy of noble metals for Cl, reduce the adsorption of Cl, and form metal acid root anions to electrostatically repel Cl - , inhibiting the occurrence of the chlorine evolution reaction (CER), thereby improving the durability of the overall catalyst in a seawater medium.

[0046] In some embodiments, the metal salt includes one or more of chromium salts, cerium salts, vanadium salts, and tin salts; one or more of chromium salts, cerium salts, vanadium salts, and tin salts are used to provide a metal source for the metal oxide layer, and a metal oxide layer is prepared on the surface of the metal support.

[0047] In a preferred embodiment, the metal salt is a chromium salt, and the chromium salt includes chromium nitrate or chromium chloride or chromium sulfate.

[0048] In some embodiments, the noble metal salt includes one or more of ruthenium salts and iridium salts. The noble metal salt is used to provide catalytically active metal ions to form noble metal oxide on the surface of the metal oxide layer; when the noble metal salt includes both ruthenium salt and iridium salt at the same time, multi-component noble metal oxide can be formed on the surface of the metal oxide layer.

[0049] In a preferred embodiment, the ruthenium salt is potassium chlororuthenate or ruthenium chloride.

[0050] In some embodiments, the concentration of the second solution is 0.5 - 2 mM. Controlling it within this concentration range helps achieve the optimal ruthenium loading amount and reduce production costs.

[0051] In some embodiments, the alkaline precipitating agent includes one or more of urea, ammonia water, sodium hydroxide, hexamethylenetetramine, ammonium carbonate, sodium carbonate, and ammonium bicarbonate. The alkaline precipitating agent mainly provides an alkaline environment for slow hydrolysis, promoting the uniform precipitation of hydroxides and crystal growth.

[0052] In some embodiments, before the step S20, a pretreatment of the metal support is further included, including the steps of: putting the metal support into an acid solution for ultrasonic washing for 20 - 40 min to remove surface oxides and impurities, and then washing with deionized water to obtain a clean metal support.

[0053] In some embodiments, the acid solution is a hydrochloric acid solution with a concentration of 2 - 4 mol / L.

[0054] In some embodiments, the molar ratio of the metal salt to the alkaline precipitating agent is 1:(5 - 8).

[0055] In some embodiments, the temperature of the first hydrothermal reaction is 100°C - 200°C, and the time of the first hydrothermal reaction is 1 h - 10 h; by using the first hydrothermal treatment, a metal support with a self - supporting structure and wrapped with hydroxides on the outer layer can be obtained.

[0056] In some embodiments, the temperature of the first annealing treatment is 300°C - 500°C, the time of the first annealing treatment is 1 h - 3 h, and the heating rate of the first annealing treatment is 2°C / min - 5°C / min. Through the first annealing treatment, the hydroxides can be thermally decomposed to form metal oxides, which are uniformly distributed on the surface of the metal support to form a metal oxide layer. The first annealing treatment is carried out in an air atmosphere.

[0057] In a preferred embodiment, the temperature of the first hydrothermal reaction is 120°C, and the time of the first hydrothermal reaction is 2 h; the temperature of the first annealing treatment is 400°C, the time of the first annealing treatment is 2 h, and the heating rate of the first annealing treatment is 5°C / min.

[0058] In some embodiments, the temperature of the second hydrothermal reaction is 80°C - 100°C, and the time of the second hydrothermal reaction is 1 h - 2 h.

[0059] In some embodiments, the temperature of the second annealing treatment is 300°C - 500°C, the time of the second annealing treatment is 2h - 6h, and the heating rate of the second annealing treatment is 2°C / min - 5°C / min. A heterostructure is formed through the second annealing treatment, and the material components are evenly distributed. The second annealing treatment is carried out in an air atmosphere.

[0060] In a preferred embodiment, the temperature of the second annealing treatment is 400°C, the time of the second annealing treatment is 4h, and the heating rate of the second annealing treatment is 5°C / min.

[0061] In addition, the present invention also provides an application of a seawater corrosion-resistant oxygen evolution catalyst in electrolytic seawater hydrogen production.

[0062] In this embodiment, using the seawater corrosion-resistant oxygen evolution catalyst for electrolytic seawater hydrogen production has high catalytic activity, and this catalyst has seawater corrosion resistance, which can extend the service life of the catalyst and reduce the hydrogen production cost.

[0063] The following further gives examples to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be construed as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the protection scope of the present invention.

[0064] Example 1

[0065] In this example, nickel foam (NF) is used as the metal carrier, Cr2O3 as the metal oxide layer, and RuO2 as the noble metal oxide to prepare the RuO2 / Cr2O3 / NF catalyst. The specific steps are as follows:

[0066] Add 0.75 mmol of chromium nitrate nonahydrate and 5 mmol of urea to the inner lining of the reaction kettle. After adding 15 ml of deionized water, stir evenly, and then add the washed nickel foam (NF). React at 120°C for 2h to hydrothermally synthesize CrO x H y / NF.

[0067] Put CrO x H y / NF into a muffle furnace with a heating rate of 5°C / min, anneal at 400°C for 2h, and the gas atmosphere is air. After the annealing treatment, Cr2O3 / NF can be obtained.

[0068] Put Cr2O3 / NF into a container, add 5 ml of deionized water to it, add 0.1 mL of 40 mg / ml K2RuCl6 aqueous solution, and heat it at 90 °C for 1 h. Then take it out, wash, dry, and put it into a muffle furnace. Heat it at a heating rate of 5 °C / min at 400 °C for 4 h, and the gas atmosphere is air to obtain the RuO2 / Cr2O3 / NF catalyst.

[0069] The crystal phase structure diagram and scanning electron microscope image of the sample are as Figure 2 and Figure 3 shown, proving that RuO2 grows uniformly on the surface of Cr2O3.

[0070] All electrochemical tests were carried out on a CHI 760E electrochemical workstation. Select the prepared RuO2 / Cr2O3 / NF catalyst as the working electrode (with an area of 0.3 cm 2 ), a carbon rod as the counter electrode, and a mercury / mercuric oxide electrode as the reference electrode to form a three-electrode system. Electrochemical tests were carried out in 1 mol / L KOH solution and alkaline seawater (real seawater dissolved with 1 mol / L KOH) respectively. Linear sweep polarization curve tests were carried out on it at a scan rate of 10 mV / s. The test results are as attached Figure 4 shown, and the large current stability test in alkaline seawater is as attached Figure 5 shown. It can be seen that the prepared self-supporting structure catalyst RuO2 / Cr2O3 / NF exhibits excellent OER electrocatalytic activity and stability during the electrolysis of seawater.

[0071] In summary, the present invention provides a seawater corrosion-resistant oxygen evolution catalyst, its preparation method and application. The seawater corrosion-resistant oxygen evolution catalyst includes a metal carrier, a metal oxide layer covering the surface of the metal carrier, and a noble metal oxide and / or a multi-noble metal oxide loaded on the surface of the metal oxide layer; the metal oxide in the metal oxide layer can form metal acid root anions. The present invention can form a stable heterostructure between the metal oxide layer loaded on the surface of the metal carrier and the noble metal oxide and / or the multi-noble metal oxide, which can inhibit the oxidation and precipitation of noble metals to a certain extent, and at the same time can regulate the electronic structure of the active center noble metal oxide and / or the multi-noble metal oxide to make it have higher catalytic activity and stronger stability. Moreover, the metal oxide layer has strong seawater corrosion resistance and can play a certain protective role for the metal carrier. At the same time, the metal oxide layer can optimize the adsorption energy of noble metals for Cl, reduce the adsorption of Cl, and electrostatically repel Cl by forming metal acid root anions -, the occurrence of the chlorine evolution reaction (CER) is inhibited, thereby enhancing the overall durability of the catalyst in a seawater medium. In addition, the synthesis process of the catalyst is simple, economical, and can be prepared on a large scale. The prepared catalyst has both excellent electrocatalytic activity and seawater electrolysis stability.

[0072] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description. All such improvements and transformations shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A seawater corrosion-resistant oxygen evolution catalyst, characterized in that, It includes a metal support, a metal oxide layer covering the surface of the metal support, and a noble metal oxide and / or a multi-noble metal oxide supported on the surface of the metal oxide layer; the metal oxide in the metal oxide layer can form metal acid root anions in an aqueous medium.

2. The oxygen evolution catalyst resistant to seawater corrosion according to claim 1, characterized in that, The metal support includes one of nickel foam, copper foam, titanium felt, and cobalt foam.

3. The oxygen evolution catalyst resistant to seawater corrosion according to claim 1, characterized in that, The metal oxide includes one or more of Cr2O3, CeO2, V2O5, and SnO2; the noble metal oxide includes one or more of RuO2 and IrO2; the multi-component noble metal oxide is Ru x Ir 1-x O2, where x is 0-1.

4. The oxygen evolution catalyst resistant to seawater corrosion according to claim 1, wherein The thickness of the metal oxide layer is 0.5 μm - 5 μm; the loading amount of the noble metal oxide and / or the multi-noble metal oxide in the seawater corrosion-resistant oxygen evolution catalyst is 0.5 wt% - 10 wt%.

5. A method for preparing a seawater corrosion-resistant oxygen evolution catalyst according to any one of claims 1-4, characterized in that, It includes the steps: Mix a metal salt, an alkaline precipitant, and a solvent to obtain a first solution; Mix the metal support with the first solution, perform a first hydrothermal reaction, and then perform a first annealing treatment to obtain a precursor material with a self-supporting structure; Mix at least one noble metal salt with a solvent to obtain a second solution; Mix the precursor material with the second solution, perform a second hydrothermal reaction, and then perform a second annealing treatment to obtain a seawater corrosion-resistant oxygen evolution catalyst.

6. The preparation method of the seawater corrosion-resistant oxygen evolution catalyst according to claim 5, characterized in that, The metal salt includes one or more of chromium salts, cerium salts, vanadium salts, and tin salts; and / or, the noble metal salt includes one or more of ruthenium salts and iridium salts.

7. The preparation method of the seawater corrosion-resistant oxygen evolution catalyst according to claim 5, characterized in that, The alkaline precipitant includes one or more of urea, ammonia water, sodium hydroxide, hexamethylenetetramine, ammonium carbonate, sodium carbonate, and ammonium bicarbonate.

8. The preparation method of the seawater corrosion-resistant oxygen evolution catalyst according to claim 5, wherein, The temperature of the first hydrothermal reaction is 100°C - 200°C, and the time of the first hydrothermal reaction is 1 h - 10 h; and / or, the temperature of the first annealing treatment is 300°C - 500°C, the time of the first annealing treatment is 1 h - 3 h, and the heating rate of the first annealing treatment is 2°C / min - 5°C / min.

9. The preparation method of the seawater corrosion-resistant oxygen evolution catalyst according to claim 5, characterized in that, The temperature of the second annealing treatment is 300°C - 500°C, the time of the second annealing treatment is 2 h - 6 h, and the heating rate of the second annealing treatment is 2°C / min - 5°C / min.

10. Application of a seawater corrosion-resistant oxygen evolution catalyst according to any one of claims 1 - 4 in electrolysis of seawater for hydrogen production.

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