Ruthenium oxide combined single-layer hexagonal boron nitride electrode and preparation method and application thereof

Abstract

The invention belongs to the technical field of electro-catalysis, and relates to a ruthenium oxide combined single-layer hexagonal boron nitride electrode as well as a preparation method and application thereof. An acidic oxygen evolution reaction catalytic material ruthenium oxide is used as a basic electrode, a multi-layer stacked configuration material of solute / single-layer hexagonal boron nitride / copper foil is firstly obtained by using a transfer strategy, then is subjected to ammonium persulfate solution etching and water cleaning treatment, is transferred to the surface of the ruthenium oxide electrode, is soaked in an organic solvent to remove the solute, and then is subjected to vacuum drying to obtain the composite electrode. The ruthenium oxide catalyst combined single-layer hexagonal boron nitride electrode is obtained. The introduction of the single-layer hexagonal boron nitride can effectively inhibit dissolution and structural damage of ruthenium oxide under acidic high potential, so that the reaction stability of the catalyst in the water electrolysis anode oxygen evolution reaction is remarkably improved, and the catalytic activity is improved.

Description

Technical Field

[0001] This invention belongs to the field of electrocatalysis technology, and relates to a ruthenium oxide-bonded monolayer hexagonal boron nitride electrode, its preparation method, and its application. Background Technology

[0002] The petrochemical industry is a pillar industry of the national economy, with a large economic scale and high industrial linkages. Represented by coal chemical, natural gas chemical, petrochemical, and fine chemical industries, it ultimately produces products such as ammonia, methanol, olefins, ethylene glycol, and hydrogen peroxide through chemical unit processes including coking, gas liquefaction, chemical synthesis, and purification and separation. Hydrogen plays a crucial role as an intermediate feedstock in these processes. Currently, approximately 95% of hydrogen is produced through fossil fuel reforming, a process that faces problems such as carbon dioxide emissions. Electrolysis of water using renewable energy can achieve large-scale, low-cost, and pollution-free green hydrogen production, becoming key to achieving zero-carbon emissions in the future clean energy industry. Currently, proton exchange membrane (PEM) water electrolysis reactors are considered the most promising hydrogen production technology due to their high current density and adaptability to intermittent energy sources. The core of the PEM water electrolysis reactor is the anodic acidic oxygen evolution reaction, which provides the protons and electrons required for the reaction. Therefore, the commercialization of this technology places high demands on highly stable and highly active anolyte acidic oxygen evolution catalysts, which will have a significant impact on the overall reaction efficiency and cost of proton exchange membrane water electrolysis reactors.

[0003] Currently, compared to precious metal iridium-based catalysts, commercial ruthenium oxide is an attractive catalyst for the oxygen evolution reaction (OER) at the anolyte, offering advantages such as higher reserves, lower cost, and higher activity. However, commercial ruthenium oxide undergoes a high-potential oxidation reaction in acidic environments, where ruthenium may be further oxidized to higher valence states (such as Ru). 4+ →Ru 5+ / Ru 6+ / Ru 7+ These high-valence ruthenium species are easily soluble in acidic electrolytes, leading to the loss of active species. Simultaneously, the strongly acidic environment directly erodes the ruthenium oxide lattice, especially at grain boundaries or defects, causing ruthenium oxide particles to pulverize or peel off. Ultimately, its poor stability hinders its practical application in proton exchange membrane water electrolysis reactors. Therefore, the development of highly stable ruthenium oxide catalysts is crucial for the iteration and practical operation of proton exchange membrane water electrolysis technology. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, the present invention aims to provide a ruthenium oxide-bonded monolayer hexagonal boron nitride electrode, its preparation method, and its application, thereby overcoming the shortcomings of the prior art. The present invention employs the following technical solutions to achieve its objective:

[0005] One aspect of the present invention provides a ruthenium oxide-bonded monolayer hexagonal boron nitride electrode, comprising a substrate and a catalyst composite layer disposed on the surface of the substrate, wherein the catalyst composite layer is composed of a ruthenium oxide layer in contact with the substrate and a monolayer hexagonal boron nitride covering the surface of the ruthenium oxide layer.

[0006] The substrate material is a commonly used electrode material for acidic oxygen evolution anodes in water electrolysis, including one or more of titanium, titanium alloys, tantalum, niobium, iridium, and cobalt.

[0007] A second aspect of this invention provides a method for preparing a ruthenium oxide-bonded monolayer hexagonal boron nitride electrode, comprising the following steps:

[0008] A ruthenium oxide layer is first prepared on the substrate surface by a coating method;

[0009] Then, the monolayer hexagonal boron nitride in the copper foil loaded with monolayer hexagonal boron nitride is transferred to the surface of the ruthenium oxide layer through an interface transfer strategy.

[0010] Preferably, the preparation method includes the following steps:

[0011] (1) A slurry containing ruthenium oxide particles is coated on the surface of a substrate to obtain a ruthenium oxide catalytic electrode;

[0012] (2) An auxiliary dispersion containing a solute is coated onto the surface of a single layer of hexagonal boron nitride loaded on a copper foil to obtain a multilayer stacked material of solute / single layer of hexagonal boron nitride / copper foil.

[0013] (3) Remove the copper foil in the multilayer stacked configuration material, and then transfer the solute / monolayer hexagonal boron nitride to the surface of the ruthenium oxide catalytic electrode to form a solute / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode. Then, remove the surface solute by organic solvent treatment to obtain the target ruthenium oxide-bonded monolayer hexagonal boron nitride electrode.

[0014] The following is a detailed description of step (1):

[0015] The slurry comprises ruthenium oxide particles, alcohol solvents, and Nafion solution.

[0016] The ruthenium oxide particles can be purchased directly and do not require post-processing.

[0017] Ruthenium oxide particles are nanoparticles with an average particle size of 1–500 nm, preferably 5–200 nm, and even more preferably 10–100 nm.

[0018] Nafion solution is a solution formed by dissolving Nafion in a solvent, which can be one or more of an alcohol solvent or water. The Nafion concentration of the Nafion solution is 0.1–1.0 wt.%, and commercially available products can be used directly. The alcohol solvent is a monobasic saturated alcohol containing 2–6 carbon atoms, specifically one or more of ethanol, n-propanol, isopropanol, n-butanol, and isobutanol.

[0019] In the slurry, the concentration of ruthenium oxide particles is 1-20 mg / mL, and the volume ratio of alcohol solvent to Nafion solution is 1:1-9:1.

[0020] The preparation method of the slurry includes: mixing ruthenium oxide particles, alcohol solvent and Nafion solution, ultrasonically dispersing for 1 to 6 hours, and then stirring for 8 to 30 hours until the ruthenium oxide particles are uniformly dispersed in alcohol solvent and Nafion solution.

[0021] The slurry is coated onto the electrode surface. The coating methods include, but are not limited to, spin coating, blade coating, spray coating, and brush coating. After drying at room temperature, a ruthenium oxide catalyst film is formed on the electrode surface.

[0022] Preferably, in the ruthenium oxide catalytic electrode, the loading of ruthenium oxide particles is 0.2–5.0 mg·cm³. -2 .

[0023] The following is a detailed description of step (2):

[0024] The auxiliary dispersion comprises a solute and an organic solvent. The solute is selected from one or more of polymethyl methacrylate (PMMA), methyl methacrylate, and polyvinyl alcohol, preferably polymethyl methacrylate. The organic solvent is a solvent for dissolving the solute and is selected from one or more of acetone, chloroform, and anisole, preferably acetone. The mass fraction of the solute in the auxiliary dispersion is 2-6 wt.%.

[0025] The monolayer hexagonal boron nitride loaded on copper foil is a copper foil monolayer boron nitride material synthesized by chemical vapor deposition, and can be directly used as purchased material.

[0026] An auxiliary dispersion was uniformly coated onto the surface of a single layer of hexagonal boron nitride using a spin coater to obtain a multilayer stacked material of solute / single layer hexagonal boron nitride / copper foil. The spin coater speed was 1000–3000 rpm, and the spin coat time was 30–90 seconds. After the coating step, a further high-temperature treatment was performed at a temperature of 120–180°C for 1–4 hours. This further high-temperature treatment ensured that the auxiliary dispersion uniformly covered the surface of the single layer of hexagonal boron nitride and increased the interaction force between the single layer of hexagonal boron nitride and the solute, making it easier to separate from the copper foil, ultimately ensuring the transfer of high-quality, high-flatness single layer hexagonal boron nitride.

[0027] The following is a detailed description of step (3):

[0028] Removing copper foil from the multilayer stacked material includes: immersing the multilayer stacked material in an ammonium persulfate solution with a concentration of 0.5–2.0 mol / L for 20–120 min to remove copper foil, and then transferring it to water to remove copper impurities, with the water treatment being repeated 3–5 times.

[0029] The solute / monolayer hexagonal boron nitride obtained by removing the copper foil is directly transferred to the surface of the ruthenium oxide catalytic electrode through the water surface to form a solute / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode. Then, it is further subjected to high temperature treatment at a temperature of 120-180°C for 1-4 hours. The high temperature treatment enhances the interaction force between the monolayer hexagonal boron nitride and the ruthenium oxide layer.

[0030] The solute / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode is treated with an organic solvent to remove the surface solute. The organic solvent is the organic solvent in the auxiliary dispersion, which can solvent the surface solute. The organic solvent treatment includes: soaking the solute / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode in organic solvent for 10-60 min, repeated 2-4 times.

[0031] A third aspect of this invention provides an application of a ruthenium oxide-bonded monolayer hexagonal boron nitride electrode as an oxygen evolution anode in acidic water electrolysis.

[0032] This invention uses commercial ruthenium oxide as a reference acidic anolyte oxygen evolution electrocatalyst, and uniformly introduces a monolayer hexagonal boron nitride protective layer on its surface to form the target electrocatalyst. A complete monolayer hexagonal boron nitride is transferred to the surface of the commercial ruthenium oxide catalyst using a polymethyl methacrylate transfer strategy, constituting an electrocatalyst combining commercial ruthenium oxide catalyst with monolayer hexagonal boron nitride. The prepared commercial ruthenium oxide catalyst combined with monolayer hexagonal boron nitride electrode is used as the working electrode in a three-electrode testing system connected to an electrochemical workstation. Ag / AgCl is used as the reference electrode, and a platinum sheet is used as the counter electrode. Linear sweep voltammetry and multi-current... The Steps program was used to test the electrochemical activity and stability of commercial ruthenium oxide and commercial ruthenium oxide catalysts combined with monolayer hexagonal boron nitride electrocatalysts. It was found that the introduction of monolayer hexagonal boron nitride improved the oxygen evolution activity of commercial ruthenium oxide catalysts in water electrolysis and significantly enhanced the reaction stability. Further structural characterization of the commercial ruthenium oxide electrocatalysts before and after the reaction was performed using techniques such as electron microscopy, demonstrating that monolayer hexagonal boron nitride effectively avoided the instability phenomena such as dissolution that occurred in commercial ruthenium oxide catalysts during the acidic anodic oxygen evolution reaction.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The commercial ruthenium oxide catalyst provided by the present invention is combined with a single-layer hexagonal boron nitride electrode. An interface transfer strategy is used to completely transfer the single-layer hexagonal boron nitride to the interface of the commercial ruthenium oxide catalyst layer, forming a stable composite electrocatalytic material, which lays the structural foundation for improving performance.

[0035] (2) The commercial ruthenium oxide catalyst provided by the present invention is combined with a single-layer hexagonal boron nitride electrode. The single-layer hexagonal boron nitride serves as an epitaxial protective layer for the commercial ruthenium oxide, which can effectively suppress the dissolution and structural damage of ruthenium oxide under acidic high potential, thereby significantly improving the reaction stability of the catalyst in the oxygen evolution reaction at the anode of water electrolysis.

[0036] (3) The commercial ruthenium oxide catalyst provided by the present invention, combined with a single-layer hexagonal boron nitride electrode, makes it easier for reactants and intermediates to undergo adsorption and desorption processes without affecting electron transport, thereby accelerating the catalytic efficiency of the reaction and ultimately improving the catalytic activity.

[0037] (4) The oxygen evolution anode of the present invention, which includes both a ruthenium oxide layer and a single layer of hexagonal boron nitride, has better catalytic activity and, in particular, better reaction stability than the oxygen evolution anode that only includes a ruthenium oxide catalyst layer, providing a better choice of catalytic material for acidic oxygen evolution reaction. Attached Figure Description

[0038] Figure 1 The X-ray diffraction patterns of the catalyst layers in Example 1 and Comparative Example 1 are shown below.

[0039] Figure 2 High-resolution transmission electron microscope images of the catalyst layers in Example 1 and Comparative Example 1;

[0040] Figure 3 The above are the Linear Sweep Voltammetry polarization curves of the catalyst layer before and after the reaction in Comparative Example 1.

[0041] Figure 4 Linear Sweep Voltammetry polarization curves of the catalyst layers in Example 1 and Comparative Example 1;

[0042] Figure 5 The results are the Multi-Current Steps test results for the catalyst layers of Example 1 and Comparative Example 1. Detailed Implementation

[0043] In the description of this invention, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, and includes both a and b. "Multiple" includes two, three, four, five, or more.

[0044] The technical solution of the present invention will be further described and illustrated below with reference to specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of helping to understand the present invention and are not intended to limit the specific scope of the present invention. Furthermore, the accompanying drawings used herein are merely for better illustrating the content disclosed in the present invention and do not limit the scope of protection. Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commonly used in the art, and the methods used in the embodiments are all conventional methods in the art.

[0045] Example 1

[0046] The oxygen evolution anode in this embodiment is prepared by the following method:

[0047] (1) 10 mg of commercial ruthenium oxide powder (average particle size: 20-30 nm), 900 μl of ethanol, and 100 μl of Nafion solution (0.5 wt.%) were mixed and ultrasonically dispersed for 4 h, followed by magnetic stirring at 300 rpm for 24 h to prepare a uniform catalyst slurry. The catalyst slurry was then uniformly coated onto the surface of a conductive titanium felt substrate using a spin-drop coating method. After drying at room temperature to evaporate the solvent, a ruthenium oxide catalytic electrode was obtained. The ruthenium oxide loading was 1 mg cm⁻¹. -2 ;

[0048] (2) Commercial copper foil containing monolayer hexagonal boron nitride was flattened, and a polymethyl methacrylate-acetone dispersion with a mass fraction of 4 wt.% was prepared. The polymethyl methacrylate-acetone dispersion was run at 3000 rpm for 60 s to uniformly coat the surface of monolayer hexagonal boron nitride, thus obtaining a multilayer stacked material of PMMA / monolayer hexagonal boron nitride / copper foil. The multilayer stacked material was subjected to high-temperature treatment at 120°C for 4 h.

[0049] (3) The above PMMA / monolayer hexagonal boron nitride / copper foil multilayer stacked material was floated on the surface of a 1.0M ammonium persulfate aqueous solution (copper foil side below), and the bottom copper foil was removed after 90 min. The PMMA / monolayer hexagonal boron nitride was then transferred to ultrapure water and washed repeatedly 3 times to remove residual copper. Then, the PMMA / monolayer hexagonal boron nitride was transferred to the surface of the ruthenium oxide catalytic electrode through the aqueous solution interface and subjected to high temperature treatment at 120°C for 4 hours to obtain the PMMA / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode. The above material was soaked in acetone solvent for 40 min and repeated 3 times to completely remove the top polymethyl methacrylate layer and obtain the final product h-BN@RuO2 electrode.

[0050] Example 2

[0051] The oxygen evolution anode in this embodiment is prepared by the following method:

[0052] (1) 8 mg of commercial ruthenium oxide powder (average particle size: 20-30 nm), 800 μl of ethanol, and 200 μl of Nafion solution (0.5 wt.%) were mixed and ultrasonically dispersed for 5 h, followed by magnetic stirring at 400 rpm for 30 h to prepare a homogeneous catalyst slurry. This catalyst slurry was then uniformly coated onto the surface of a conductive titanium felt substrate using a spin-drop coating method. After drying, a ruthenium oxide catalytic electrode was obtained, with a ruthenium oxide layer loading of 1.0 mg cm⁻¹. -2 ;

[0053] (2) A commercial copper foil containing a single layer of hexagonal boron nitride was flattened, and a polymethyl methacrylate-acetone dispersion with a mass fraction of 5 wt.% was prepared. The polymethyl methacrylate-acetone dispersion was run at 3500 rpm for 50 s to uniformly coat the surface of the single layer of hexagonal boron nitride, thus obtaining a multilayer stacked material of PMMA / single layer of hexagonal boron nitride / copper foil. The multilayer stacked material was subjected to high temperature treatment at 160°C for 2 h.

[0054] (3) The above PMMA / monolayer hexagonal boron nitride / copper foil multilayer stacked material was floated on the surface of a 1.5M ammonium persulfate aqueous solution (copper foil side below), and the bottom copper foil was removed after 100 min. The PMMA / monolayer hexagonal boron nitride was further transferred to ultrapure water and washed repeatedly 3 times to remove residual copper. Then, the PMMA / monolayer hexagonal boron nitride was transferred to the surface of the ruthenium oxide catalytic electrode through the aqueous solution interface and subjected to high temperature treatment at 160°C for 2 hours to obtain the PMMA / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode. The above material was soaked in acetone solvent for 50 min and repeated 3 times to completely remove the top layer of polymethyl methacrylate and obtain the final product h-BN@RuO2 electrode.

[0055] Comparative Example 1

[0056] The oxygen evolution anode of Comparative Example 1 was prepared by the following method:

[0057] (1) 10 mg of commercial ruthenium oxide powder (average particle size: 20-30 nm), 900 μl of ethanol, and 100 μl of Nafion solution (0.5 wt.%) were mixed and ultrasonically dispersed for 4 h, followed by magnetic stirring at 300 rpm for 24 h to prepare a uniform catalyst slurry. The catalyst slurry was then uniformly coated onto the surface of a conductive titanium felt substrate using a spin-drop coating method. After drying at room temperature to evaporate the solvent, a ruthenium oxide catalytic electrode was obtained. The loading of the ruthenium oxide layer was 1 mg cm⁻¹. -2 .

[0058] Using Example 1 and Comparative Example 1 as working electrodes, Ag / AgCl as reference electrodes, and a platinum sheet electrode as counter electrodes, a three-electrode system was formed. Oxygen evolution at the anode (OER) was tested under acidic conditions of 0.5 M H₂SO₄. Linear Sweep Voltammetry and Multi-Current Steps were performed using a Shanghai Chenhua CHI 760E electrochemical workstation.

[0059] Figure 1 The X-ray diffraction patterns of the catalyst layers in Example 1 and Comparative Example 1 show that the characteristic peaks of the sample in Example 1 are the same as those in Comparative Example 1, indicating that the introduction of the monolayer material did not change the crystal structure of the original commercial ruthenium oxide material and maintained the original characteristic peaks; high-resolution transmission electron microscopy (HRTEM) is also shown. Figure 2 As shown, the catalyst layer of Example 1 has the same lattice spacing and crystal face as Comparative Example 1 after undergoing the acidic anodic oxygen evolution reaction. This indicates that the crystal structure of commercial ruthenium oxide is protected after the introduction of a single layer of hexagonal boron nitride, and no structural collapse or other phenomena occur.

[0060] Figure 3 The Linear Sweep Voltammetry polarization curves of the catalyst layer before and after the reaction in Comparative Example 1 show that after the acidic anodic oxygen evolution reaction, the catalyst layer of Comparative Example 1 experiences a decline in catalytic performance due to the instability of the commercial ruthenium oxide catalyst, resulting in a significant reduction in electrochemical activity.

[0061] Figure 4 The Linear Sweep Voltammetry polarization curves of the catalyst layers in Example 1 and Comparative Example 1 show that, compared to the catalyst in Comparative Example 1, the anodic oxygen evolution activity of the catalyst in Example 1 is significantly improved, indicating that the introduction of a monolayer of hexagonal boron nitride can effectively enhance electrochemical activity. Further... Figure 5 As shown, the potential (V) of Comparative Example 1 increased significantly over time, indicating that its catalyst activity decreased drastically over time and its electrochemical stability was poor; while the potential of Example 1 was stable, indicating that its catalyst had better stability during the oxygen evolution reaction. The above data show that the introduction of monolayer hexagonal boron nitride is beneficial to optimizing the stability of the oxygen evolution reaction of commercial ruthenium oxide catalysts in the acidic anode.

[0062] All aspects, embodiments, and features of this invention should be considered illustrative in all respects and not limiting of the invention; the scope of the invention is defined only by the claims. Other embodiments, modifications, and uses will become apparent to those skilled in the art without departing from the spirit and scope of the invention as claimed.

[0063] In the preparation method of this invention, the order of the steps is not limited to the listed order. For those skilled in the art, variations in the order of the steps without creative effort are also within the scope of protection of this invention. Furthermore, two or more steps or actions can be performed simultaneously.

[0064] Finally, it should be noted that the specific embodiments described herein are merely illustrative examples of the invention and are not intended to limit the implementation of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them; it is neither necessary nor possible to exemplify all embodiments here. However, these obvious variations or modifications derived from the essential spirit of the invention still fall within the scope of protection of the invention, and interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A ruthenium oxide-bonded monolayer hexagonal boron nitride electrode, characterized in that, It includes a substrate and a catalyst composite layer disposed on the surface of the substrate, the catalyst composite layer being composed of a ruthenium oxide layer in contact with the substrate and a monolayer of hexagonal boron nitride covering the surface of the ruthenium oxide layer.

2. The ruthenium oxide-bonded monolayer hexagonal boron nitride electrode according to claim 1, characterized in that, The base material is one or more of titanium, titanium alloy, tantalum, niobium, iridium, and cobalt.

3. The method for preparing a ruthenium oxide-bonded monolayer hexagonal boron nitride electrode as described in claim 1, characterized in that, Includes the following steps: A ruthenium oxide layer is first prepared on the substrate surface by a coating method; Then, the monolayer hexagonal boron nitride in the copper foil loaded with monolayer hexagonal boron nitride is transferred to the surface of the ruthenium oxide layer through an interface transfer strategy.

4. The preparation method according to claim 3, characterized in that, The preparation method includes the following steps: (1) A slurry containing ruthenium oxide particles is coated on the surface of a substrate to obtain a ruthenium oxide catalytic electrode; (2) An auxiliary dispersion containing a solute is coated onto the surface of a single layer of hexagonal boron nitride loaded on a copper foil to obtain a multilayer stacked material of solute / single layer of hexagonal boron nitride / copper foil. (3) Remove the copper foil in the multilayer stacked configuration material, and then transfer the solute / monolayer hexagonal boron nitride to the surface of the ruthenium oxide catalytic electrode to form a solute / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode. Then, remove the surface solute by organic solvent treatment to obtain the target ruthenium oxide-bonded monolayer hexagonal boron nitride electrode.

5. The preparation method according to claim 4, characterized in that, Ruthenium oxide particles are nanoparticles with an average particle size of 1–500 nm; And / or, the slurry comprises ruthenium oxide particles, an alcohol solvent, and a Nafion solution, wherein the concentration of ruthenium oxide particles in the slurry is 1–20 mg / mL, and the volume ratio of the alcohol solvent to the Nafion solution is 1:1–9:1; And / or, the preparation method of the slurry includes: mixing ruthenium oxide particles, an alcohol solvent and a Nafion solution, ultrasonically dispersing for 1 to 6 hours, and then stirring for 8 to 30 hours until the ruthenium oxide particles are uniformly dispersed in the alcohol solvent and the Nafion solution.

6. The preparation method according to claim 4, characterized in that, The auxiliary dispersion includes a solute and an organic solvent, wherein the solute is selected from one or more of polymethyl methacrylate, methyl methacrylate and polyvinyl alcohol, and the organic solvent is selected from one or more of acetone, chloroform and anisole; And / or, the mass fraction of the solute in the auxiliary dispersion is 2-6 wt.%.

7. The preparation method according to claim 4, characterized in that, The auxiliary dispersion was uniformly coated onto a single layer of hexagonal boron nitride using a spin coater. The spin coater speed was 1000-3000 rpm and the spin coat time was 30-90 seconds. After the coating step in step (2), a high-temperature treatment is performed. The temperature of the high-temperature treatment is 120-180°C and the treatment time is 1-4 hours.

8. The preparation method according to claim 4, characterized in that, The step of removing copper foil from the multilayer stacked material includes: immersing the multilayer stacked material in an ammonium persulfate solution with a concentration of 0.5–2.0 mol / L for 20–120 min to remove copper foil, and then transferring it to water to remove copper impurities; And / or, the solute / monolayer hexagonal boron nitride is transferred to the surface of the ruthenium oxide catalytic electrode through the water surface to form a solute / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode, and then further subjected to high-temperature treatment at a temperature of 120-180°C for a time of 1-4 hours.

9. The preparation method according to claim 4, characterized in that, In step (3), the organic solvent treatment includes: soaking the solute / monolayer hexagonal boron nitride / ruthenium oxide catalytic electrode in organic solvent for 10 to 60 minutes, repeating 2 to 4 times.

10. The application of the ruthenium oxide-bonded monolayer hexagonal boron nitride electrode as described in claim 1 as an oxygen evolution anode in acidic water electrolysis.

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