A platinum monatomic-loaded nickel-vanadium layered double hydroxide electrocatalyst, a preparation method and application thereof

Abstract

The application belongs to the technical field of catalytic materials, and particularly relates to a platinum monatomic atom supported nickel vanadium layered double hydroxide electrocatalyst as well as a preparation method and application thereof. The application discloses a preparation method of a nickel vanadium layered double hydroxide (Pt1 / NiV-LDH) electrocatalyst with an ultra-low platinum (Pt) monatomic atom load and application of the electrocatalyst in chlorine-resistant hydrogen production under an industrial current density. The Pt1 / NiV-LDH electrocatalyst is composed of a reaction active substance and a carrier, wherein the reaction active substance is a Pt monatomic atom, and the carrier is a nickel vanadium layered double hydroxide nanomaterial. The application in-situ oxidizes and designs and synthesizes a high-efficiency Pt1 / NiV-LDH catalyst by using a simple solvothermal method with H2PtCl6.6H2O as a Pt source. The catalyst exhibits excellent electrocatalytic hydrogen evolution (HER) performance in an alkaline electrolyte. Moreover, the catalyst has a relatively high mass activity, exhibits excellent alkaline HER catalytic activity and stability under an industrial current density, and is suitable for market promotion and application.

Description

Technical Field

[0001] This invention belongs to the field of catalytic materials technology, and relates to a nickel-vanadium layered double hydroxide electrocatalyst supported on platinum single atoms, its preparation method and application, specifically relating to a preparation method of a nickel-vanadium layered double hydroxide (Pt1 / NiV-LDH) electrocatalyst with ultra-low Pt single atom loading and its application in chlorine-resistant hydrogen production at industrial current densities. Background Technology

[0002] Hydrogen energy, as a novel green and zero-carbon clean energy source, plays a crucial role in achieving carbon peaking and contributing to carbon neutrality. While water electrolysis is an important method for producing "green hydrogen," its production is limited by the scarcity of freshwater resources. Researchers have therefore turned their attention to the abundant seawater, but the complex composition of seawater presents numerous challenges to direct hydrogen production technology. Under electrolysis conditions, the generated insoluble precipitates and chloride ions lead to low efficiency and poor stability of the electrocatalyst. Furthermore, the lack of hydrogen protons in alkaline electrolytes means that the protons required for adsorption must be provided by water molecules. This increased water dissociation step under alkaline conditions severely limits the efficiency of HER (hydrogen electrolysis). Therefore, developing highly efficient HER catalysts for high current densities and direct seawater electrolysis is of great significance.

[0003] Among numerous catalysts, single-atom catalysts (SACs) not only possess extremely low metal loading and near 100% atom utilization, but their unique electronic and geometric structures also endow them with ultra-high selectivity. Furthermore, the strong interactions between atoms and the metal support can accelerate charge transfer during the catalytic reaction, enhancing catalytic activity. These advantages have made them a research hotspot. However, single atoms have high surface free energy, and in actual reactions, isolated atoms can easily migrate and aggregate into clusters or nanoparticles, affecting the catalytic performance of the catalyst. Therefore, finding suitable support materials to reduce or avoid the migration and aggregation of single atoms is crucial to achieving optimal catalytic performance of SACs. Summary of the Invention

[0004] In view of this, the present invention discloses a nickel-vanadium layered double hydroxide electrocatalyst supported on platinum single atoms, its preparation method and application, specifically disclosing a preparation method of a nickel-vanadium layered double hydroxide (Pt1 / NiV-LDH) electrocatalyst with ultra-low Pt single atom loading and its application in chlorine-resistant hydrogen production at industrial current densities.

[0005] It should be noted that nickel-based layered double hydroxides (Ni-LDH) are advantageous for stabilizing intrinsically active noble metal single atoms due to their stable layered structure, tunable composition, abundant active sites, and large amount of surface oxygen. Furthermore, doping with the high-valence transition metal vanadium (V) can stabilize the surface oxygen of Ni-LDH to prevent structural collapse, attract surrounding electrons to effectively modulate the electronic structure of adjacent 3d metals, and alter the d-band center of the transition metal-based catalyst. This optimizes the adsorption and desorption of catalytic reaction intermediates by each metal active site, thereby improving the catalytic performance of the active sites. Supporting noble metal single atoms on V-doped Ni-LDH (NiV-LDH) can significantly improve the stability of single-atom catalysts and maximize the unique advantages of each metal active site to enhance catalytic activity. Based on these reasons, designing and preparing electrocatalysts that disperse Pt single atoms on ultrathin NiV-LDH nanosheets to improve their catalytic activity and stability in water electrolysis for hydrogen production is feasible and a pressing technical problem that needs to be solved.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first technical objective of this invention is to provide a method for preparing a nickel-vanadium layered double hydroxide electrocatalyst supported on platinum single atoms, comprising the following steps:

[0008] Step (1): Preprocess NF, with a size of 2×4cm 2 The NF was successively immersed in hydrochloric acid and sonicated, then in deionized water and finally in ethanol and sonicated, and then air-dried for later use.

[0009] Step (2): Dissolve chloroplatinic acid in an ethylene glycol solution containing urea, and then mix the solution with a deionized aqueous solution containing nickel nitrate and vanadium trichloride and stir until homogeneous;

[0010] Step (3): Immerse the NF pretreated in step (1) into the mixed solution obtained in step (2), and then transfer it to a polytetrafluoroethylene-lined stainless steel reactor for reaction;

[0011] Step (4): After the reaction in step (3) is completed, the obtained sample is washed several times with deionized water and ethanol, and then vacuum dried to finally obtain the Pt1 / NiV-LDH electrocatalyst supported on NF.

[0012] Optionally, the immersion ultrasound operation in step (1) is as follows: first, a 2×4cm sample is placed in an ultrasound chamber. 2 The NF was immersed in 3 mol / L hydrochloric acid and sonicated for 15 minutes, then sonicated in deionized water for 6 minutes, and finally sonicated in ethanol for 5 minutes.

[0013] Optionally, in step (2), the mass ratio of chloroplatinic acid to urea is 0.01:0.12, the mass-volume ratio of urea to ethylene glycol solution is 120mg:20mL, and the total number of nickel nitrate and vanadium trichloride ions is 1.6mmol.

[0014] Optionally, the reaction temperature in step (3) is 120°C and the reaction time is 12h.

[0015] Specifically, it includes the following steps:

[0016] Step (1): Preprocess NF, first, the size is 2×4cm 2 The NF was immersed in 3 mol / L hydrochloric acid and sonicated for 15 minutes, then sonicated in deionized water for 6 minutes, and finally sonicated in ethanol for 5 minutes, and then air-dried for later use.

[0017] Step (2): Dissolve 0.01g H2PtCl6·6H2O in 20mL of ethylene glycol solution containing 120mg urea, then mix the solution with 20mL of deionized water solution containing Ni(NO3)2·6H2O and VCl3 (total ion count of 1.6mmol) and stir until homogeneous.

[0018] Step (3): Immerse the pretreated NF in the mixed solution obtained in step (2), then transfer it to a 100 mL polytetrafluoroethylene-lined stainless steel reactor and react at 120 °C for 12 h;

[0019] Step (4): After the reaction in step (3) is completed, the obtained sample is washed several times with deionized water and ethanol, and then vacuum dried for 6 hours to finally obtain the Pt1 / NiV-LDH electrocatalyst supported on NF.

[0020] This invention employs a simple solvothermal method to design and synthesize a highly efficient Pt1 / NiV-LDH catalyst using H2PtCl6·6H2O as the Pt source for in-situ oxidation. This catalyst exhibits excellent HER performance in a series of alkaline electrolytes, including 1M KOH, 1M KOH + 0.5 / 1.0 / 2.0M NaCl, and 1M KOH + natural seawater. Furthermore, the electrocatalyst synthesized in this invention has an almost zero onset potential in alkaline media and exhibits a 20.98s overpotential at 200mV. -1 Its ultra-high turnover frequency (TOF) value is 3.8 times that of commercial Pt / C, its mass activity is 9 times that of commercial Pt / C electrodes, and it exhibits excellent alkaline HER catalytic activity and stability at industrial current densities.

[0021] It should be noted that the nanomaterial electrocatalysts prepared in this invention have a larger specific surface area and a higher density of catalytic active sites compared to traditional bulk electrocatalysts, thus exhibiting superior electrocatalytic activity. However, conventional nanomaterial electrocatalysts are prone to dissolution in strong acid or strong base electrolytes, resulting in the loss of active components and reduced stability. The hierarchical superstructured nanocatalysts composed of ultrasmall or ultrathin nanomaterials with nanostructures can overcome this drawback. These hierarchical superstructured nanocatalysts not only possess a high density of active sites but also exhibit structural stability similar to bulk materials, which will contribute to improved electrocatalytic performance.

[0022] Furthermore, the volcano plot illustrates the relationship between the catalytic activity of a material and its hydrogen adsorption free energy. Pt is very close to the top of the volcano plot curve, possessing a suitable hydrogen adsorption free energy; therefore, Pt-based electrocatalysts typically exhibit ultra-high catalytic activity in HER processes. In addition, thanks to Pt's unique electronic structure, its 5d orbital is located furthest from the Fermi level, which facilitates electron transport and migration through Pt, thereby enhancing electron transfer between surface active sites and reactants, making it easier for reaction intermediates to adsorb onto its surface and form activated intermediates.

[0023] The second technical objective of this invention is to provide a nickel-vanadium layered double hydroxide electrocatalyst supported on platinum single atoms, prepared as described above. The electrocatalyst is a nickel-vanadium layered double hydroxide Pt1 / NiV-LDH, specifically an ultrathin NiV-LDH nanosheet supported on Pt single atoms, i.e., an ultrathin NiV-LDH nanosheet modified with Pt single atoms. The Pt1 / NiV-LDH electrocatalyst consists of a reactive material and a support, wherein the reactive material is a Pt single atom, and the support is a nickel-vanadium layered double hydroxide nanomaterial.

[0024] Furthermore, the electrocatalyst is synthesized in situ using conductive substrate nickel foam (NF) as a self-supporting support and a simple solvothermal method with chloroplatinic acid hexahydrate (H2PtCl6·6H2O) as the Pt source.

[0025] This invention designs and synthesizes a highly efficient Pt1 / NiV-LDH catalyst by using a simple solvothermal method with H2PtCl6·6H2O as the Pt source for in-situ oxidation. This catalyst exhibits excellent electrocatalytic hydrogen evolution (HER) performance in alkaline electrolytes; moreover, it has high mass activity and shows excellent alkaline HER catalytic activity and stability at industrial current densities, making it suitable for commercial promotion and application.

[0026] The third technical objective of this invention is to provide an application of the nickel-vanadium layered double hydroxide electrocatalyst supported on platinum single atoms prepared by the method described above in electrocatalytic hydrogen production.

[0027] Specifically, the application of the nickel-vanadium layered double hydroxide electrocatalyst supported on platinum single atoms in chlorine-resistant hydrogen production at industrial current densities.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] (1) This invention discloses a method for preparing an ultra-low Pt single-atom loading nickel-vanadium layered double hydroxide (Pt1 / NiV-LDH) electrocatalyst and its application in chlorine-resistant hydrogen production at industrial current density; the material is an ultra-thin nanosheet NiV-LDH loaded with Pt single atoms (Pt1 / NiV-LDH), and the electrocatalyst is synthesized in situ by in-situ oxidation using conductive substrate nickel foam (NF) as a self-supporting support and a simple solvothermal method with chloroplatinic acid hexahydrate (H2PtCl6·6H2O) as the Pt source.

[0030] (2) This invention uses a Pt1 / NiV-LDH self-supporting electrode, avoiding the difficulties in charge transfer caused by the blockage of active sites and increased interfacial resistance due to the use of binders, as well as the uncontrollable side reactions that may occur due to the degradation of the binder itself. Furthermore, the Pt1 / NiV-LDH electrocatalyst can achieve a 2000 mA / cm² overpotential in a 1M KOH + 2M NaCl solution with only a 207 mV overpotential. -2 The Pt1 / NiV-LDH electrocatalyst exhibits excellent resistance to hydrogen evolution under chlorine conditions. In a 1M KOH seawater solution, the Pt1 / NiV-LDH electrocatalyst requires only 130 and 215 mV overpotentials to achieve current densities of 1000 and 2000 mA cm⁻¹, respectively. -2 Industrial-grade current density, and at 500 mA cm⁻¹ -2 It exhibits high stability exceeding 500 hours. Furthermore, an anion exchange membrane (AEMWE) electrolytic cell assembled using Pt1 / NiV-LDH as the cathode electrode requires only low voltages of 1.55V and 1.62V to achieve 500 and 1000 mA cm⁻¹, respectively. -2 The current density shows that the nickel-vanadium layered double hydroxide (Pt1 / NiV-LDH) electrocatalyst with ultra-low Pt single atom loading disclosed in this invention has great potential for practical application.

[0031] In summary, the Pt1 / NiV-LDH electrocatalyst exhibits excellent chlorine resistance during seawater electrolysis and demonstrates excellent alkaline HER catalytic activity and stability at industrial-grade current densities. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This is a flowchart of the preparation process of Pt1 / NiV-LDH electrocatalyst.

[0034] Figure 2 X-ray diffraction and Raman spectra of NiV-LDH and Pt1 / NiV-LDH electrocatalysts.

[0035] Figure 3 In the figure, ab) is the spherical aberration electron microscopy of the Pt1 / NiV-LDH electrocatalyst; c) is the fitting of the fine absorption spectrum of Pt single atom X-rays; dh) is the elemental mapping spectrum of each component of the Pt1 / NiV-LDH electrocatalyst.

[0036] Figure 4 Scanning electron microscope (SEM) images of Pt1 / NiV-LDH electrocatalysts with different Pt contents.

[0037] Figure 5 a) Polarization curves for evaluating the high current density hydrogen production performance of Pt1 / NiV-LDH electrocatalysts with different Pt contents in water electrolysis; b) Histograms for evaluating the hydrogen production performance of Pt1 / NiV-LDH electrocatalysts with different Pt contents in water electrolysis.

[0038] Figure 6 This is a comparison of polarization curves before and after cycle stability testing of Pt1 / NiV-LDH electrocatalyst and commercial Pt / C electrocatalyst.

[0039] Figure 7 Catalytic performance (a) and stability (b) of anion exchange membrane electrolyzer (AEM) assembled with Pt1 / NiV-LDH catalyst and NiFe-LDH.

[0040] Figure 8 Polarization curves show the catalytic performance of Pt1 / NiV-LDH catalyst in electrolysis of brine (a) and alkaline seawater (b). Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] The term "embodiment" used herein, as an example, is not necessarily to be construed as superior to or better than other embodiments. Performance testing in the embodiments of this application, unless otherwise specified, employs conventional testing methods in the art. It should be understood that the terminology used in this application is merely for describing particular implementations and is not intended to limit the scope of this disclosure.

[0043] Unless otherwise stated, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; other experimental methods and technical means not specifically mentioned herein refer to experimental methods and technical means commonly used by one of ordinary skill in the art.

[0044] To better illustrate the content of this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In the embodiments, some methods, means, instruments, and devices well-known to those skilled in the art are not described in detail in order to highlight the main points of this application.

[0045] Without conflict, the technical features disclosed in the embodiments of this application can be combined arbitrarily, and the resulting technical solution belongs to the content disclosed in the embodiments of this application.

[0046] This invention discloses a nickel-vanadium layered double hydroxide electrocatalyst supported on platinum single atoms, its preparation method and application, specifically involving a method for preparing a nickel-vanadium layered double hydroxide (Pt1 / NiV-LDH) electrocatalyst with ultra-low Pt single atom loading and its application in chlorine-resistant hydrogen production at industrial current densities.

[0047] To better understand the present invention, the following embodiments are provided for further detailed description of the present invention, but they should not be construed as limiting the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above-described invention are also considered to fall within the protection scope of the present invention.

[0048] Example 1

[0049] A method for preparing a Pt single-atom modified ultrathin NiV-LDH nanosheet (Pt1 / NiV-LDH) electrocatalyst, the specific process is as follows: Figure 1 As shown, it includes the following steps:

[0050] Step (1): Preprocess NF, first, the size is 2×4cm 2 The nickel foam was immersed in 3M hydrochloric acid and sonicated for 15 minutes, then sonicated in deionized water for 6 minutes, and finally sonicated in ethanol for 5 minutes, and then air-dried for later use.

[0051] Step (2): Dissolve 0.01 g H2PtCl6·6H2O in 20 mL of ethylene glycol solution containing 120 mg urea. Then, mix the above solution with an aqueous solution containing Ni(NO3)2·6H2O and VCl3 (total ion count of 1.6 mmol) and stir until homogeneous.

[0052] Step (3): Immerse the pretreated NF into the mixed solution obtained in step (2), then transfer it to a 100 mL polytetrafluoroethylene-lined stainless steel reactor and react at 120 °C for 12 h.

[0053] Step (4): After the reaction, the sample was washed several times with deionized water and ethanol, and then vacuum dried for 6 hours to finally prepare the Pt1 / NiV-LDH electrocatalyst supported on NF.

[0054] Application Example 1: Testing the HER catalytic performance of Pt1 / NiV-LDH electrocatalyst in alkaline medium

[0055] like Figure 2-4 As shown, the crystal structure and microstructure of the obtained Pt1 / NiV-LDH electrocatalyst were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, spherical aberration electron microscopy, and fine X-ray absorption spectroscopy. These characteristics confirmed that Pt1 / NiV-LDH exists in the form of nanosheets, and the introduction of Pt did not alter the crystal structure of NiV-LDH, with Pt atoms fixed on the surface of NiV-LDH as single atoms.

[0056] The HER performance of Pt1 / NiV-LDH electrocatalysts was tested in 1.0 M KOH solution. Figure 5 and Figure 6 As shown, Pt1 / NiV-LDH (Pt1 / NiV-LDH) with a Pt content of 0.39 wt% exhibits the best HER catalytic performance, requiring only 9 and 46 mV to achieve 10 and 100 mA cm⁻¹, respectively. -2 The current density. Furthermore, the Pt1 / NiV-LDH catalyst requires only 84 and 130 mV overpotentials to achieve 500 and 1000 mA cm⁻¹, respectively. -2 The high current density is much lower than that of NiV-LDH (322mV@500mA cm⁻¹). -2 381mV@1000mA cm -2Pt / C electrode (181mV@500mA cm) -2 279mV@1000mA cm -2 Even at 2000mAcm -2 At ultra-high current densities, Pt1 / NiV-LDH requires only an extremely low overpotential of 243 mV, indicating its excellent HER catalytic activity and demonstrating the potential for industrial application of the Pt1 / NiV-LDH catalyst.

[0057] Application Example 2: Performance Test of Full Electrolysis of Water

[0058] To investigate the practical application potential of the Pt1 / NiV-LDH catalyst in water electrolysis, Pt1 / NiV-LDH was used as the cathode electrode, and NiFe layered double hydroxide (NiFe-LDH) was used as the anode electrode. Tests were conducted in an AEMWE using 1 MkOH as the electrolyte. Figure 7 As shown, at an operating temperature of 60℃, NiFe-LDH(+)||Pt1 / NiV-LDH(-) exhibits a low onset potential of 1.45V, and its current density can reach 500 and 1000 mA / cm at voltages of 1.55V and 1.62V, respectively. -2 It is superior to most reported electrocatalysts.

[0059] Furthermore, at an operating temperature of 25℃, NiFe-LDH(+)||Pt1 / NiV-LDH(-) at 1000 mA / cm² -2 It can operate stably for about 100 hours at industrial-grade current density. Figure 7 Although a slight decay occurred, the decay rate was only 0.05 mVh. -1 This indicates that Pt1 / NiV-LDH has excellent stability and practical applications.

[0060] Application Example 3: Testing the HER catalytic performance of Pt1 / NiV-LDH electrocatalyst in alkaline seawater medium.

[0061] The practical performance of Pt1 / NiV-LDH electrocatalyst for seawater electrolysis was evaluated in alkaline seawater (1M KOH + 0.5M NaCl) and alkaline natural seawater (1M KOH + seawater). Figure 8 As shown, the self-supported Pt1 / NiV-LDH electrocatalyst maintained excellent catalytic activity in 1M KOH + 0.5M NaCl solution, requiring only 85mV and 129mV overpotentials to reach 500 and 1000 mAcm, respectively. -2 The current density indicates that it has good tolerance to chloride ions.

[0062] Furthermore, by testing Pt1 / NiV-LDH in 1MKOH solution with different Cl... - The corrosion resistance was evaluated by measuring the HER concentration.

[0063] Test results show that: with Cl - Increase in concentration (≥1.0 MCl) - The corresponding HER overpotential increases slightly, especially at low current densities (≤500 mA / cm). -2 However, when the operating current density exceeds 1000 mA / cm²... -2 When the HER overpotential of the Pt1 / NiV-LDH catalyst increases with Cl, - The concentration decreased significantly with increasing concentration, indicating that the Pt1 / NiV-LDH catalyst has good corrosion resistance.

[0064] In addition, the HER performance of the Pt1 / NiV-LDH catalyst in alkaline natural seawater (1MKOH+seawater) was evaluated.

[0065] Test results show that the Pt1 / NiV-LDH electrocatalyst can operate at both low and high current densities (from 10 to 2000 mA / cm²). -2 It still exhibits excellent catalytic activity, with overpotentials of only 130 and 215 mV reaching 1000 and 2000 mA / cm, respectively. -2 The industrial-grade current density is far lower than that of Pt / C (362mV@1000mAcm). -2 551mV@2000mAcm -2 ), Pt foil (587mV@1000mAcm -2 851mV@2000mAcm -2 These results demonstrate the highly efficient HER catalytic activity exhibited by the Pt1 / NiV-LDH electrocatalyst in seawater electrolysis. This invention provides a new approach for the design and preparation of electrocatalysts for direct seawater electrolysis.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Use of a platinum monatomically supported nickel vanadium layered double hydroxide electrocatalyst for the production of hydrogen at industrial current densities resistant to chlorine, characterized in that, The electrocatalyst is Pt1 / NiV-LDH, which is an ultrathin nanosheet NiV-LDH supported Pt monatomic atom, i.e., a Pt monatomic atom modified ultrathin NiV-LDH nanosheet; and the electrocatalyst takes a conductive substrate nickel foam (NF) as a self-supporting carrier, and is in-situ oxidized and synthesized by using a simple solvothermal method with hexahydrate chloroplatinic acid (H2PtCl6·6H2O) as a Pt source.

2. The use of a platinum single atom supported nickel vanadium layered double hydroxide electrocatalyst according to claim 1 for the hydrogen evolution under industrial current densities, characterized in that, The preparation method of the electrocatalyst specifically comprises the following steps: Step (1): Pretreatment of NF, the NF with size of 2 x 4 cm 2 was sequentially immersed in hydrochloric acid, deionized water and ethanol under ultrasonication, and then air dried for use; Step (2): dissolving chloroplatinic acid in a glycol solution containing urea, then mixing and stirring the solution with a deionized aqueous solution containing nickel nitrate and vanadium trichloride uniformly; The mass ratio of chloroplatinic acid to urea is 0.01:0.12, the mass-volume ratio of urea to glycol solution is 120 mg:20 mL, and the total ion number of nickel nitrate and vanadium trichloride is 1.6 mmol; Step (3): immersing the NF pretreated in step (1) into the mixed solution obtained in step (2), and then transferring to a polytetrafluoroethylene-lined stainless steel reaction kettle for reaction; Step (4): after the reaction in step (3) is completed, the obtained sample is washed with deionized water and ethanol several times, and then vacuum dried, to obtain the Pt1 / NiV-LDH electrocatalyst loaded on the NF.

3. Use of a platinum single atom supported nickel vanadium layered double hydroxide electrocatalyst according to claim 2 for the production of hydrogen at industrial current densities, characterized in that, The immersion sonication in step (1) was performed by first immersing a 2 x 4 cm 2 piece of NF in 3 mol / L hydrochloric acid for 15 minutes, then in deionized water for 6 minutes, and finally in ethanol for 5 minutes.

4. The use of a platinum single atom supported nickel vanadium layered double hydroxide electrocatalyst according to claim 2 for the hydrogen evolution under industrial current densities, characterized in that, The reaction temperature in step (3) is 120°C, and the reaction time is 12 h.

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