Nanohoneycomb electrolytic water catalyst and preparation method thereof

Abstract

The application belongs to the technical field of hydrogen production by electrolysis of water, and particularly relates to a nano-honeycomb-shaped water electrolysis catalyst and a preparation method thereof. O2 generated after thermal decomposition of a strong oxidant is used as a self-sacrificial template to participate in synthesis of the catalyst. After the synthesis is completed, the O2 template is removed through ultrasonic waves to obtain the nano-honeycomb-shaped water electrolysis catalyst. The application optimizes the electronic structure of a multi-metal sulfide, improves the activity and stability of the catalyst in the HER process, and improves the water electrolysis performance.

Description

Technical Field

[0001] This invention relates to the field of water electrolysis for hydrogen production technology, specifically to a nano-honeycomb water electrolysis catalyst and its preparation method. Background Technology

[0002] Hydrogen energy boasts numerous advantages, including high energy density, wide applicability, and suitability for large-scale energy storage. Producing green hydrogen through water electrolysis using renewable energy sources can achieve zero-carbon emissions in hydrogen production. However, the hydrogen evolution reaction (HER) remains a critical bottleneck in water electrolysis for hydrogen production, with its slow kinetics being a significant drawback. Pt / C is the most effective electrocatalyst for improving HER performance, but its high price and scarcity hinder its industrial application. Therefore, there is an urgent need to develop inexpensive, efficient, and durable HER electrocatalysts to replace precious metal catalysts.

[0003] Polymetallic sulfide catalysts have attracted much attention due to their thermodynamic high-entropy effect, lattice distortion effect, slow diffusion effect, and cocktail effect. However, during water electrolysis, polymetallic sulfides, constrained by their structure, inevitably undergo metal dissolution and phase separation, resulting in poor stability. Therefore, it is urgent to design their structures to effectively improve the electrocatalytic activity and stability of polymetallic sulfides. Summary of the Invention

[0004] To address the problems existing in the prior art, the main objective of this invention is to propose a nano-honeycomb electrolytic water catalyst and its preparation method, thereby optimizing the electronic structure of polymetallic sulfides and improving the catalyst's activity and stability in the HER process.

[0005] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0006] A nano-honeycomb water electrolysis catalyst, wherein the catalyst is a (NiCoMoMn)S water electrolysis catalyst and has a honeycomb morphology.

[0007] To solve the above-mentioned technical problems, according to another aspect of the present invention, the present invention provides the following technical solution:

[0008] A method for preparing the above-mentioned nano-honeycomb water electrolysis catalyst involves using O2 generated after the thermal decomposition of a strong oxidant as a self-sacrificing template to participate in the synthesis of the catalyst. After the synthesis is completed, the O2 template is removed by ultrasonication to obtain the nano-honeycomb water electrolysis catalyst.

[0009] As a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, the preparation method includes the following steps:

[0010] S1. Dissolve nickel, cobalt, molybdenum, manganese, and sulfur sources in deionized water and mix ultrasonically until completely dissolved to form solution A; mix hydrogen peroxide solution and nitric acid solution thoroughly under mechanical stirring to form solution B;

[0011] S2. Under mechanical stirring, heat solution B to a certain temperature, and while stirring, add solution A dropwise to solution B to form solution C, and continue stirring for a certain period of time;

[0012] S3. Heat solution C to a certain temperature and stir continuously for a certain time under the action of condensation;

[0013] S4. After the reaction is complete, the nano-honeycomb water electrolysis catalyst is prepared by sonication, washing, drying and calcination.

[0014] In a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, in step S1, the nickel source, cobalt source, molybdenum source, manganese source, and sulfur source are respectively derived from nickel nitrate, cobalt nitrate, ammonium molybdate, manganese sulfate, and thiourea, and the molar ratio of nickel, cobalt, molybdenum, manganese, and sulfur in the nickel source, cobalt source, molybdenum source, manganese source, and sulfur source is (2.5-5.5):(2.0-4.5):(1.5-3.5):(1.5-3.0):(3.0-4.5).

[0015] In a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, in step S1, the concentration of the hydrogen peroxide solution is 20-50 vol%, the concentration of the nitric acid solution is 2.5-8.5 vol%, and the volume ratio of the hydrogen peroxide solution to the nitric acid solution is 10:(1.5-5.5).

[0016] In a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, in step S2, the temperature is 35-55°C and the stirring time is 1.5-2.5 h.

[0017] In a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, in step S3, the temperature is 95-125°C and the stirring time is 18-24h.

[0018] In a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, in step S4, the ultrasonic time is 5-7 hours and the ultrasonic frequency is 20-50 kHz.

[0019] In a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, in step S4, the drying temperature is 50-70°C and the drying time is 10-14h.

[0020] In a preferred embodiment of the preparation method of the nano-honeycomb electrolytic water catalyst of the present invention, in step S4, the calcination temperature is 250-450°C and the calcination time is 1.5-4.5 h.

[0021] To solve the above-mentioned technical problems, according to another aspect of the present invention, the present invention provides the following technical solution:

[0022] Application of the above-mentioned nano-honeycomb water electrolysis catalyst in the field of water electrolysis.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention proposes a nano-honeycomb water electrolysis catalyst and its preparation method. O2 generated after the thermal decomposition of a strong oxidant is used as a self-sacrificing template to participate in the synthesis of the catalyst. After the synthesis is completed, the O2 template is removed by ultrasound to obtain the nano-honeycomb water electrolysis catalyst. This invention optimizes the electronic structure of polymetallic sulfides, improves the activity and stability of the catalyst in the HER process, and improves the water electrolysis performance. Attached Figure Description

[0025] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a TEM image of the catalyst prepared in Example 1 of the present invention;

[0027] Figure 2 The above are linear sweep voltammetry curves of the catalysts prepared in the various embodiments and comparative examples of this invention.

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions described below in conjunction with the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The main objective of this invention is to propose a nano-honeycomb electrolysis catalyst and its preparation method, which has at least the following advantages:

[0031] (1) The catalyst prepared by this invention uses low-cost raw materials, has a short operation cycle, high repeatability, and is easy to scale up.

[0032] (2) This invention provides a simple preparation method, in which O2 generated by the thermal decomposition of a strong oxidant is used as a self-sacrificing template to participate in the synthesis of the catalyst. After the chemical reaction is completed, the O2 template is removed by ultrasound to prepare a nano-honeycomb (NiCoMoMn)S water electrolysis catalyst. This catalyst is then applied to the field of hydrogen production by water electrolysis, enriching the synthesis and preparation technology of polymetallic sulfides and greatly expanding its commercial application value.

[0033] According to one aspect of the present invention, the present invention provides the following technical solution:

[0034] A nano-honeycomb water electrolysis catalyst, wherein the catalyst is a (NiCoMoMn)S water electrolysis catalyst and has a honeycomb morphology.

[0035] According to another aspect of the present invention, the present invention provides the following technical solution:

[0036] A method for preparing the above-mentioned nano-honeycomb electrolytic water catalyst uses O2 generated after the thermal decomposition of a strong oxidant as a self-sacrificing template to participate in the synthesis of the catalyst. After the synthesis is completed, the O2 template is removed by ultrasound to obtain the nano-honeycomb electrolytic water catalyst. This method solves the problems of low electrocatalytic activity, complex structural design, and cumbersome preparation process of polymetallic sulfides.

[0037] Preferably, the preparation method includes the following steps:

[0038] S1. Dissolve nickel, cobalt, molybdenum, manganese, and sulfur sources in deionized water and mix ultrasonically until completely dissolved to form solution A; mix hydrogen peroxide solution and nitric acid solution thoroughly under mechanical stirring to form solution B;

[0039] S2. Under mechanical stirring, heat solution B to a certain temperature, and while stirring, add solution A dropwise to solution B to form solution C, and continue stirring for a certain period of time;

[0040] S3. Heat solution C to a certain temperature and stir continuously for a certain time under condensation; condensation is achieved by circulating cooling water in the condenser tube to prevent the evaporation of solution C.

[0041] S4. After the reaction is complete, the nano-honeycomb water electrolysis catalyst is prepared by sonication, washing, drying and calcination.

[0042] Preferably, in step S1, the nickel source, cobalt source, molybdenum source, manganese source, and sulfur source are respectively derived from nickel nitrate, cobalt nitrate, ammonium molybdate, manganese sulfate, and thiourea, and the molar ratio of nickel, cobalt, molybdenum, manganese, and sulfur in the nickel source, cobalt source, molybdenum source, manganese source, and sulfur source is (2.5-5.5):(2.0-4.5):(1.5-3.5):(1.5-3.0):(3.0-4.5).

[0043] Preferably, in step S1, the concentration of the hydrogen peroxide solution is 20-50 vol%, the concentration of the nitric acid solution is 2.5-8.5 vol%, and the volume ratio of the hydrogen peroxide solution to the nitric acid solution is 10:(1.5-5.5).

[0044] Preferably, in step S2, the temperature is 35-55°C and the stirring time is 1.5-2.5 hours.

[0045] Preferably, in step S3, the temperature is 95–125°C, and the stirring time is 18–24 hours.

[0046] Preferably, in step S4, the ultrasound duration is 5-7 hours and the ultrasound frequency is 20-50 kHz.

[0047] Preferably, in step S4, the drying temperature is 50–70°C and the drying time is 10–14 hours.

[0048] Preferably, in step S4, the calcination temperature is 250–450°C and the calcination time is 1.5–4.5 h.

[0049] According to another aspect of the present invention, the present invention provides the following technical solution:

[0050] Application of the above-mentioned nano-honeycomb water electrolysis catalyst in the field of water electrolysis.

[0051] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0052] Example 1

[0053] A method for preparing a nano-honeycomb electrolysis catalyst includes: weighing 1.566g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, and 1.328g (NH4)6Mo7O. 240.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 20 vol% hydrogen peroxide solution and 15 mL of 2.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 25 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 105 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was complete, the solution was ultrasonicated at 50 kHz for 5 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to prepare a nano-honeycomb (NiCoMoMn)S water electrolysis catalyst. Its TEM image is shown below. Figure 1 As shown, the catalyst morphology is honeycomb-like.

[0054] Example 2

[0055] The difference from Example 1 is that Ni(NO3)3·6H2O, Co(NO3)3·6H2O, and (NH4)6Mo7O are used. 24 The amounts of MnSO4·H2O and SC(NH2)2 used are different.

[0056] Weigh 1.672g Ni(NO3)3·6H2O, 1.551g Co(NO3)3·6H2O, 1.438g(NH4)6Mo7O 24 1.026 g MnSO4·H2O and 2.165 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 20 vol% hydrogen peroxide solution and 15 mL of 2.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 25 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 105 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was completed, the solution was ultrasonicated at a frequency of 50 kHz for 5 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to prepare a nano-honeycomb (NiCoMoMn)S water electrolysis catalyst.

[0057] Example 3

[0058] The difference from Example 1 is that the concentrations of the hydrogen peroxide solution and the nitric acid solution are different.

[0059] Weigh 1.566g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, 1.328g(NH4)6Mo7O24 0.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 25 vol% hydrogen peroxide solution and 15 mL of 3.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 25 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 105 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was completed, the solution was ultrasonicated at a frequency of 20 kHz for 7 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to prepare a nano-honeycomb (NiCoMoMn)S water electrolysis catalyst.

[0060] Example 4

[0061] The difference from Example 1 is that the temperature of solution B is different.

[0062] Weigh 1.566g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, 1.328g(NH4)6Mo7O 24 0.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 20 vol% hydrogen peroxide solution and 15 mL of 2.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 35 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 105 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was completed, the solution was ultrasonicated at a frequency of 30 kHz for 6 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to prepare a nano-honeycomb (NiCoMoMn)S water electrolysis catalyst.

[0063] Example 5

[0064] The difference from Example 1 is that the temperature of solution C is different.

[0065] Weigh 1.566g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, 1.328g(NH4)6Mo7O 240.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 20 vol% hydrogen peroxide solution and 15 mL of 2.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 25 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 115 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was complete, the solution was ultrasonicated at a frequency of 50 kHz for 5 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to prepare a nano-honeycomb (NiCoMoMn)S water electrolysis catalyst.

[0066] Comparative Example 1

[0067] The difference from Example 1 is that: Ni(NO3)3·6H2O, Co(NO3)3·6H2O, (NH4)6Mo7O 24 The amounts of MnSO4·H2O and SC(NH2)2 used are different.

[0068] Weigh 3.665g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, 4.330g(NH4)6Mo7O 24 0.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 20 vol% hydrogen peroxide solution and 15 mL of 2.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 25 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 105 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was complete, the solution was ultrasonicated at a frequency of 50 kHz for 5 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to obtain the product.

[0069] Comparative Example 2

[0070] The difference from Example 1 is that the concentrations of the hydrogen peroxide solution and the nitric acid solution are different.

[0071] Weigh 1.566g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, 1.328g(NH4)6Mo7O 240.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 5 vol% hydrogen peroxide solution and 15 mL of 1 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 25 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 105 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was complete, the solution was ultrasonicated at 50 kHz for 5 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to obtain the product.

[0072] Comparative Example 3

[0073] The difference from Example 1 is that the temperature of solution B is different.

[0074] Weigh 1.566g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, 1.328g(NH4)6Mo7O 24 0.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 20 vol% hydrogen peroxide solution and 15 mL of 2.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 20 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 105 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was complete, the solution was ultrasonicated at 50 kHz for 5 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to obtain the product.

[0075] Comparative Example 4

[0076] The difference from Example 1 is that the temperature of solution C is different.

[0077] Weigh 1.566g Ni(NO3)3·6H2O, 1.451g Co(NO3)3·6H2O, 1.328g(NH4)6Mo7O 240.926 g MnSO4·H2O and 1.996 g SC(NH2)2 were dissolved in deionized water and ultrasonically mixed until completely dissolved to form solution A. 100 mL of 20 vol% hydrogen peroxide solution and 15 mL of 2.5 vol% nitric acid solution were prepared and mixed with stirring to form solution B. The temperature of solution B was raised to 25 °C under mechanical stirring. While stirring, solution A was added dropwise to solution B to form solution C, and stirring was continued for 1.5 h. Solution C was heated to 140 °C and reacted continuously for 20 h under mechanical stirring and condensation. After the reaction was complete, the solution was ultrasonicated at a frequency of 50 kHz for 5 h, repeatedly washed, dried at 50 °C for 10 h, and then calcined at 250 °C for 2 h to obtain the product.

[0078] The electrochemical performance of the products prepared in Examples 1-5 and Comparative Examples 1-4 was detected using linear voltammetry to obtain the hydrogen evolution performance of water electrolysis, such as... Figure 2 As shown. From Figure 2 Linear sweep voltammetry curves show that, at the same current density, the hydrogen evolution overpotential of Examples 1-5 is much lower than that of Comparative Examples 1-4. This indicates that the polymetallic sulfide water electrolysis catalyst of the present invention uses O2 generated after the thermal decomposition of a strong oxidant as a self-sacrificing template in the catalyst synthesis. After the chemical reaction is completed, the O2 template is removed by ultrasonication, and a nano-honeycomb structure of the (NiCoMoMn)S water electrolysis catalyst is designed, achieving low energy consumption and high hydrogen evolution efficiency of the water electrolysis hydrogen production membrane electrode. Meanwhile, Comparative Examples 1-2 cannot continue water electrolysis hydrogen production at higher current densities, indicating that the nano-honeycomb (NiCoMoMn)S water electrolysis catalyst of the present invention can achieve high current density water electrolysis hydrogen production.

[0079] This invention uses O2 generated from the thermal decomposition of a strong oxidant as a self-sacrificing template to participate in the synthesis of the catalyst. After the synthesis is completed, the O2 template is removed by ultrasound to prepare a nano-honeycomb electrolytic water catalyst. This invention optimizes the electronic structure of polymetallic sulfides, improves the activity and stability of the catalyst in the HER process, and improves the performance of water electrolysis.

[0080] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A nano-honeycomb water electrolysis catalyst, characterized in that, The catalyst is a (NiCoMoMn)S water electrolysis catalyst with a honeycomb morphology. The method for preparing the nano-honeycomb water electrolysis catalyst involves using O2 generated after the thermal decomposition of a strong oxidant as a self-sacrificing template to participate in the synthesis of the catalyst. After the synthesis is completed, the O2 template is removed by ultrasonication to obtain the nano-honeycomb water electrolysis catalyst. The preparation method includes the following steps: S1. Dissolve nickel, cobalt, molybdenum, manganese, and sulfur sources in deionized water and ultrasonically mix until completely dissolved to form solution A; mix hydrogen peroxide solution and nitric acid solution thoroughly under mechanical stirring to form solution B; the molar ratio of nickel, cobalt, molybdenum, manganese, and sulfur in the nickel, cobalt, molybdenum, manganese, and sulfur sources is (2.5–5.5):(2.0–4.5):(1.5–3.5):(1.5–3.0):(3.0–4.5); the concentration of the hydrogen peroxide solution is 20–50 vol%, the concentration of the nitric acid solution is 2.5–8.5 vol%, and the volume ratio of hydrogen peroxide solution to nitric acid solution is 10:(1.5–5.5); S2. Under mechanical stirring, heat solution B to 35-55℃, and while stirring, add solution A dropwise to solution B to form solution C, and continue stirring for a certain period of time; S3. Heat solution C to 95-125℃ and stir continuously for a certain period of time under condensation. S4. After the reaction is complete, the nano-honeycomb water electrolysis catalyst is prepared by sonication, washing, drying and calcination.

2. A method for preparing the nano-honeycomb electrolytic water catalyst according to claim 1, characterized in that, Includes the following steps: S1. Dissolve nickel, cobalt, molybdenum, manganese, and sulfur sources in deionized water and ultrasonically mix until completely dissolved to form solution A; mix hydrogen peroxide solution and nitric acid solution thoroughly under mechanical stirring to form solution B; the molar ratio of nickel, cobalt, molybdenum, manganese, and sulfur in the nickel, cobalt, molybdenum, manganese, and sulfur sources is (2.5–5.5):(2.0–4.5):(1.5–3.5):(1.5–3.0):(3.0–4.5); the concentration of the hydrogen peroxide solution is 20–50 vol%, the concentration of the nitric acid solution is 2.5–8.5 vol%, and the volume ratio of hydrogen peroxide solution to nitric acid solution is 10:(1.5–5.5); S2. Under mechanical stirring, heat solution B to 35-55℃, and while stirring, add solution A dropwise to solution B to form solution C, and continue stirring for a certain period of time; S3. Heat solution C to 95-125℃ and stir continuously for a certain period of time under condensation. S4. After the reaction is complete, the nano-honeycomb water electrolysis catalyst is prepared by sonication, washing, drying and calcination.

3. The preparation method of the nano-honeycomb electrolytic water catalyst according to claim 2, characterized in that, In step S1, the nickel source, cobalt source, molybdenum source, manganese source, and sulfur source are respectively derived from nickel nitrate, cobalt nitrate, ammonium molybdate, manganese sulfate, and thiourea.

4. The preparation method of the nano-honeycomb electrolytic water catalyst according to claim 2, characterized in that, In step S2, the stirring time continues for 1.5 to 2.5 hours.

5. The method for preparing the nano-honeycomb electrolytic water catalyst according to claim 2, characterized in that, In step S3, the stirring time is 18-24 hours.

6. The method for preparing the nano-honeycomb electrolytic water catalyst according to claim 2, characterized in that, In step S4, the ultrasonic time is 5-7 hours and the ultrasonic frequency is 20-50 kHz; the drying temperature is 50-70°C and the drying time is 10-14 hours; the calcination temperature is 250-450°C and the calcination time is 1.5-4.5 hours.

7. The application of the nano-honeycomb water electrolysis catalyst according to claim 1 in the field of water electrolysis.

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