Hydrogen peroxide production piezoelectric core-shell heterojunction, preparation method and application thereof
By preparing a core-shell heterojunction of barium titanate-nitrogen-doped carbon-molybdenum disulfide, the problems of low charge separation efficiency and insufficient material stability in piezoelectric catalysis technology were solved, and efficient and low-energy hydrogen peroxide preparation was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Hangzhou Gongshu District University of Technology Future Technology Research Institute
- Filing Date
- 2026-03-10
- Publication Date
- 2026-07-03
AI Technical Summary
Existing piezoelectric catalysis technology faces challenges in the preparation of hydrogen peroxide, such as low charge separation efficiency, poor selectivity of two-electron oxygen reduction, limited oxygen mass transfer, and insufficient material stability. These challenges result in low catalytic efficiency and make it difficult to achieve efficient, low-energy-consumption, and green synthesis.
A piezoelectric core-shell heterojunction with a three-layer core-shell structure consisting of barium titanate as the core, nitrogen-doped carbon layer as the intermediate layer, and molybdenum disulfide nanosheets as the outer shell is adopted. Molybdenum disulfide is grown in situ via hydrothermal method to form a catalyst with strong piezoelectric response and abundant active sites. Combined with the electron bridging and buffering effect of the carbon layer, efficient mechanical energy capture and charge separation are achieved.
It significantly improved the yield and selective catalytic ability of hydrogen peroxide, achieved efficient conversion of mechanical energy into chemical energy across the entire chain, and enhanced the stability and catalytic efficiency of the material.
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Figure CN122321912A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of piezoelectric catalytic hydrogen peroxide production technology, and particularly relates to a piezoelectric core-shell heterojunction for hydrogen peroxide production, its preparation method, and its application. Background Technology
[0002] Hydrogen peroxide (H2O2), as an important green oxidant and energy carrier, is widely used in chemical synthesis, environmental remediation, medical disinfection, semiconductor cleaning, and new energy fields. Traditionally, it is mainly produced on a large scale through the anthraquinone process. While this method is mature, it has significant drawbacks: complex process flow, high energy consumption, reliance on precious metal catalysts and organic solvents, and involvement of high-pressure hydrogen operation, posing significant safety hazards. Furthermore, the production process generates toxic byproducts and large amounts of wastewater, contradicting the principles of green chemistry. To address the needs of distributed, small-scale, and clean production, the development of efficient, low-energy-consumption, and environmentally friendly novel hydrogen peroxide preparation technologies has become an urgent priority.
[0003] Piezoelectric catalysis utilizes the inherent piezoelectric effect of materials to convert widely available mechanical energy in the environment (such as ultrasound, water flow, vibration, etc.) into charge carriers and surface potential required for chemical reactions, providing a new pathway for the green synthesis of hydrogen peroxide. Its core advantages lie in its sustainable energy source (no need for light or external bias, directly utilizing waste energy), mild reaction conditions (room temperature and pressure), and clean process (typically requiring only water and oxygen as raw materials). Theoretically, it also has the potential for low energy consumption and simple equipment, meeting the needs of distributed and on-site production. However, in practical applications for hydrogen peroxide preparation, this technology still faces a series of key scientific challenges and bottlenecks: low charge separation efficiency, poor selectivity for two-electron oxygen reduction, limited oxygen mass transfer, and insufficient material stability, which restrict its catalytic efficiency and practical application.
[0004] Existing patent document 1, "High-Temperature and High-Dielectric Polymer-Based Composite Dielectric Material and its Preparation Method and Application" (publication number CN111892805A), uses molybdenum disulfide particles, whose active sites are not easily exposed, and the mechanical energy that can be captured is limited, which in turn affects the intensity of the generated piezoelectric response.
[0005] Existing patent document 2, "A method for preparing barium titanate / cobalt tetroxide composite material for piezoelectric catalytic hydrogen peroxide production" (publication number CN117943013A), uses cobalt tetroxide that is not grown in situ, which will cause the cobalt tetroxide to fall off under ultrasonic action, and cobalt ion leaching under acidic conditions will also cause pollution.
[0006] Existing patent document 3, "Preparation of molybdenum disulfide-coated barium titanate nanomaterial and its piezoelectric photocatalytic application" (publication number CN119702009A), does not have a carbon layer pre-coating on the barium titanate, which prevents molybdenum ions and sulfur ions from being pre-adsorbed on the barium titanate surface. This results in molybdenum disulfide not growing completely on the barium titanate surface or having a low molybdenum disulfide loading. Furthermore, piezoelectric photocatalysis, which is mainly photocatalysis with piezoelectric catalysis as a supplement, leads to more energy loss and low energy utilization.
[0007] Existing patent document four, “A piezoelectric heterojunction catalyst for producing hydrogen peroxide and its preparation method and application” (publication number CN119926388A), has a narrow pH adjustment range for the reaction solution, is sensitive to precursor concentration and temperature, and is prone to generating impurity phases (such as Bi2O3). The addition of sodium dodecylbenzenesulfonate may introduce carbon residues, which may cover active sites or affect interfacial charge transport. High-temperature calcination is required to remove these residues, but calcination may lead to nanosheet aggregation or phase transformation. Summary of the Invention
[0008] The purpose of this invention is to solve the aforementioned technical problems existing in the prior art, and to provide a piezoelectric core-shell heterojunction for hydrogen peroxide production, its preparation method, and its application. The outermost layer of the prepared piezoelectric core-shell heterojunction has a single-layer, dispersed nanosheet morphology, which can capture more mechanical energy, thereby generating a stronger piezoelectric response. At the same time, the nanosheet morphology can expose more active sites, which is beneficial to piezoelectric catalytic reactions. This solves the technical problem that the heterojunction catalysts prepared by existing processes have weak piezoelectric response and active sites, making it difficult to produce high yields of hydrogen peroxide.
[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0010] A method for preparing a hydrogen peroxide-producing piezoelectric core-shell heterojunction, characterized by comprising the following steps:
[0011] S1. First, mix NaOH and KOH in the aqueous phase, then add BaCl2·2H2O and TiO2 in sequence to obtain a mixture.
[0012] S2. The mixture in S1 is subjected to a hydrothermal reaction to obtain barium titanate piezoelectric material;
[0013] S3. The barium titanate piezoelectric material in S2 is polymerized with dopamine hydrochloride to obtain a nitrogen-doped carbon layer-encapsulated barium titanate piezoelectric catalyst.
[0014] S4. The nitrogen-doped carbon layer in S3 is used to encapsulate barium titanate piezoelectric catalyst, Na2MoO4·2H2O and CH4N2S and disperse them in the aqueous phase to obtain a piezoelectric core-shell heterojunction precursor.
[0015] S5. The piezoelectric core-shell heterojunction precursor in S4 is subjected to a hydrothermal reaction to obtain a piezoelectric core-shell heterojunction with molybdenum disulfide grown in situ.
[0016] A hydrogen peroxide-producing piezoelectric core-shell heterojunction, characterized in that it is prepared by the above-described preparation method.
[0017] The application of the above-mentioned piezoelectric core-shell heterojunction in the production of hydrogen peroxide is characterized by the following method: dispersing the piezoelectric core-shell heterojunction in deionized water and carrying out a piezoelectric catalytic reaction under ultrasonic excitation to generate hydrogen peroxide.
[0018] The present invention, by adopting the above-described technical solution, has the following beneficial effects:
[0019] The fabricated piezoelectric core-shell heterojunction has a three-layer core-shell structure with barium titanate as the core, nitrogen-doped carbon layer as the intermediate layer, and molybdenum disulfide nanosheets as the outer shell. This structure cleverly combines the advantages of two piezoelectric materials:
[0020] 1. Barium titanate has a strong piezoelectric coefficient and can be used as a core for efficient "mechanical energy to electrical energy" conversion, generating a strong polarized electric field.
[0021] 2. Molybdenum disulfide not only has a good piezoelectric response, but its larger specific surface area and abundant edge active sites can efficiently adsorb and activate oxygen molecules, significantly promote the two-electron oxygen reduction pathway, and selectively generate hydrogen peroxide.
[0022] 3. The middle carbon layer plays a dual role as an "electron bridge" and a "buffer layer". It can accelerate the directional migration of BaTiO3 polarized charges to the active surface of MoS2 and inhibit recombination. It can also enhance the mechanical and chemical stability of the heterojunction. The nitrogen in the carbon layer can fix Mo in molybdenum disulfide, thus enhancing the stability of the material.
[0023] 4. This synergistic system achieves full-chain optimization from efficient mechanical energy capture and charge separation to surface selective catalysis, providing a new approach to overcome the activity and selectivity bottlenecks in piezoelectric synthesis of hydrogen peroxide. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings:
[0025] Figure 1 SEM images of the piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3;
[0026] Figure 2 TEM images of the piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3;
[0027] Figure 3 This is a schematic diagram of the core-shell heterojunction obtained in this invention;
[0028] Figure 4 XRD patterns of the piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3;
[0029] Figure 5 Raman diagrams of the piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3;
[0030] Figure 6 XPS images of the piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3;
[0031] Figure 7 XPS images of the piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3;
[0032] Figure 8 The graphs show the piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3, and their performance in producing hydrogen peroxide via piezoelectric catalysis. Detailed Implementation
[0033] A method for preparing a hydrogen peroxide-producing piezoelectric core-shell heterojunction includes the following steps:
[0034] S1. Dissolve NaOH and KOH in deionized water, with each NaOH and KOH weighing 8-12g and having a mass ratio of 51.5 / 48.5. Add 18-25mL of deionized water and disperse evenly under magnetic stirring. Then add BaCl2·2H2O, with an addition amount of 2-2.5mmol. Continue stirring and dispersing. Finally, add TiO2, with an addition amount of 1-1.5mmol. Continue stirring until evenly dispersed for 0.5-1h to obtain the mixture.
[0035] S2. Transfer the mixture from S1 to a reactor for hydrothermal reaction. The reactor volume is 50-100 mL, the reaction temperature is 180-200℃, and the reaction time is 20-24 h. After the reaction, wash the reaction product 3-6 times with anhydrous ethanol and ultrapure water respectively. After washing, dry the product at 50-70℃ for 3-6 h to obtain barium titanate piezoelectric material.
[0036] S3. The barium titanate piezoelectric material from S2 is dispersed in a Tris buffer solution with a mass of 0.5-1 g and a concentration of 10-20 mmol / L. The pH of the Tris buffer solution is ≥8.5. Then, dopamine hydrochloride is added with a mass of 0.05-0.1 g. The polymerization reaction is carried out in an oil bath at a temperature of 60-100℃ for 6-12 h. After the reaction, the reaction product is washed 3-6 times with anhydrous ethanol and ultrapure water, respectively. After washing, it is dried at a temperature of 50-70℃ for 3-6 h. After drying, a nitrogen-doped carbon layer-coated barium titanate (NC@BTO) piezoelectric catalyst is obtained.
[0037] S4. The nitrogen-doped carbon layer-coated barium titanate piezoelectric catalyst from S3 is dispersed in deionized water. The amount of nitrogen-doped carbon layer-coated barium titanate piezoelectric catalyst added is 0.5-1 g, and the volume of deionized water is 20-30 mL. Then, Na2MoO4·2H2O and CH4N2S are added. The amount of Na2MoO4·2H2O added is 10-20 mmol, and the amount of CH4N2S added is 40-80 mmol. The reaction time is 0.5-1 h. After uniform dispersion, the piezoelectric core-shell heterojunction precursor is obtained.
[0038] S5. The piezoelectric core-shell heterojunction precursor from S4 is transferred to a reactor for hydrothermal reaction. The reactor volume is 50-100 mL, the reaction temperature is 180-200℃, and the reaction time is 20-24 h. After the reaction, the reaction product is washed 3-6 times with anhydrous ethanol and ultrapure water, respectively. After washing, it is dried at 50-70℃ for 3-6 h. After drying, the in-situ grown molybdenum disulfide piezoelectric core-shell heterojunction (MoS2-NC@BTO) is obtained.
[0039] The synthesized piezoelectric core-shell heterojunction possesses a three-layer core-shell structure: barium titanate as the core, a nitrogen-doped carbon layer as the intermediate layer, and molybdenum disulfide nanosheets as the outer shell. This structure cleverly combines the advantages of two piezoelectric materials: barium titanate has a strong piezoelectric coefficient, serving as an efficient "mechanical energy-to-electrical energy" conversion core to generate a powerful polarization electric field; while molybdenum disulfide not only possesses excellent piezoelectric response, but its larger specific surface area and abundant edge active sites can efficiently adsorb and activate oxygen molecules, significantly promoting the two-electron oxygen reduction pathway and selectively generating hydrogen peroxide. The intermediate carbon layer plays a dual role as an "electron bridge" and a "buffer layer," accelerating the directional migration of BaTiO3 polarized charges to the MoS2 active surface and inhibiting recombination, while also enhancing the mechanical and chemical stability of the heterojunction. The nitrogen in the carbon layer can fix Mo in molybdenum disulfide, enhancing the material's stability. This synergistic system achieves full-chain optimization from efficient mechanical energy capture and charge separation to surface-selective catalysis, providing a new approach to overcoming the activity and selectivity bottlenecks in piezoelectric hydrogen peroxide synthesis.
[0040] This invention uses a hydrothermal reaction method, which makes it easier to control the morphology of the material.
[0041] The application of the above-mentioned piezoelectric core-shell heterojunction in the production of hydrogen peroxide is as follows: the piezoelectric core-shell heterojunction is dispersed in deionized water, the amount of piezoelectric core-shell heterojunction added is 0.25-1 g / L, the volume of deionized water is 50-80 mL, and the piezoelectric catalytic reaction is carried out under ultrasonic excitation with a power of 40-300 W for a reaction time of 10-60 min to generate hydrogen peroxide.
[0042] Example 1
[0043] Fabrication of piezoelectric core-shell heterostructure (MoS2-NC@BTO):
[0044] S1. Dissolve 9.27g NaOH and 8.73g KOH in 20mL of deionized water and disperse evenly under magnetic stirring. Then add 2mmol BaCl2·2H2O and continue stirring to disperse. Finally, add 1.33mmol TiO2 and continue stirring for 1h until evenly dispersed to obtain the mixture.
[0045] S2. Transfer the mixture to a 100mL reactor and react at 200℃ for 24h. After the reaction is complete, wash the reaction product three times with anhydrous ethanol and ultrapure water respectively, and dry at 70℃ for 6h to obtain barium titanate piezoelectric material.
[0046] S3. 1g of barium titanate piezoelectric material was dispersed in a Tris buffer solution with a concentration of 10mmol / L and pH=8.5, and then 0.1g of dopamine hydrochloride was added. The reaction was carried out in an oil bath at 60℃ for 12h. After the reaction was completed, the reaction product was washed three times with anhydrous ethanol and ultrapure water, and dried at 70℃ for 6h to obtain a nitrogen-doped carbon layer-coated barium titanate (NC@BTO) piezoelectric catalyst.
[0047] S4. 0.5 g of nitrogen-doped carbon layer-coated barium titanate piezoelectric catalyst was dispersed in 30 mL of deionized water, and then 10 mmol Na2MoO4·2H2O and 40 mmol CH4N2S were added. The reaction was carried out for 1 h to obtain the piezoelectric core-shell heterojunction precursor.
[0048] S5. The piezoelectric core-shell heterojunction precursor was transferred to a 50 mL reactor and reacted at 200 °C for 24 h. After the reaction, the reaction product was washed three times with anhydrous ethanol and ultrapure water, respectively, and dried at 70 °C for 6 h to finally obtain the in-situ grown molybdenum disulfide piezoelectric core-shell heterojunction (MoS2-NC@BTO).
[0049] Example 2
[0050] Fabrication of piezoelectric core-shell heterostructure (MoS2-NC@BTO):
[0051] S1. Dissolve 10.3g NaOH and 9.7g KOH in 25mL of deionized water and disperse evenly under magnetic stirring. Then add 2.5mmol BaCl2·2H2O and continue stirring to disperse. Finally, add 1.5mmol TiO2 and continue stirring for 1h until evenly dispersed to obtain the mixture.
[0052] S2. Transfer the mixture to a 50mL reactor and react at 180℃ for 24h. After the reaction is complete, wash the reaction product three times with anhydrous ethanol and ultrapure water respectively, and dry at 60℃ for 6h to obtain barium titanate piezoelectric material.
[0053] S3. 0.5 g of barium titanate piezoelectric material was dispersed in a Tris buffer solution with a concentration of 15 mmol / L and pH=9, and then 0.05 g of dopamine hydrochloride was added. The reaction was carried out in an oil bath at 80 °C for 12 h. After the reaction was completed, the reaction product was washed three times with anhydrous ethanol and ultrapure water, and dried at 60 °C for 6 h to obtain a nitrogen-doped carbon layer-coated barium titanate (NC@BTO) piezoelectric catalyst.
[0054] S4. 0.8 g of nitrogen-doped carbon layer-coated barium titanate piezoelectric catalyst was dispersed in 30 mL of deionized water, and then 15 mmol Na2MoO4·2H2O and 60 mmol CH4N2S were added. The reaction was carried out for 1 h to obtain the piezoelectric core-shell heterojunction precursor.
[0055] S5. The piezoelectric core-shell heterojunction precursor was transferred to a 100 mL reactor and reacted at 180 °C for 24 h. After the reaction, the reaction product was washed three times with anhydrous ethanol and ultrapure water, and dried at 60 °C for 6 h to finally obtain the in-situ grown molybdenum disulfide piezoelectric core-shell heterojunction (MoS2-NC@BTO).
[0056] Comparative Example 1
[0057] Preparation of nitrogen-doped carbon layer-encapsulated barium titanate (NC@BTO) piezoelectric catalyst:
[0058] (1) Dissolve 9.27g NaOH and 8.73g KOH in 20mL of deionized water and disperse evenly under magnetic stirring. Then add 2mmol BaCl2·2H2O and continue stirring to disperse. Finally add 1.33mmol TiO2 and continue stirring for 1h until evenly dispersed to obtain the mixture.
[0059] (2) The mixture was transferred to a 100 mL reactor and reacted at 200 °C for 24 h. After the reaction was completed, the reaction product was washed three times with anhydrous ethanol and ultrapure water respectively, and dried at 70 °C for 6 h to obtain barium titanate piezoelectric material.
[0060] (3) 1g of barium titanate piezoelectric material was dispersed in a Tris buffer solution with a concentration of 10mmol / L and pH=8.5, and then 0.1g of dopamine hydrochloride was added. The reaction was carried out in an oil bath at 60℃ for 12h. After the reaction was completed, the reaction product was washed three times with anhydrous ethanol and ultrapure water, and dried at 70℃ for 6h to obtain nitrogen-doped carbon layer-coated barium titanate (NC@BTO) piezoelectric catalyst.
[0061] Comparative Example 2
[0062] Preparation of barium titanate piezoelectric catalyst:
[0063] (1) Dissolve 9.27g NaOH and 8.73g KOH in 20mL of deionized water and disperse evenly under magnetic stirring. Then add 2mmol BaCl2·2H2O and continue stirring to disperse. Finally add 1.33mmol TiO2 and continue stirring for 1h until evenly dispersed to obtain the mixture.
[0064] (2) The mixture was transferred to a 50 mL reactor and reacted at 200 °C for 24 h. After the reaction was completed, the reaction product was washed three times with anhydrous ethanol and ultrapure water respectively, and dried at 70 °C for 6 h to obtain barium titanate piezoelectric material.
[0065] Comparative Example 3
[0066] Preparation of molybdenum disulfide piezoelectric catalyst:
[0067] (1) 10 mmol Na2MoO4·2H2O and 40 mmol CH4N2S were dispersed in 30 mL of deionized water and reacted for 1 h to obtain the MoS2 piezoelectric catalyst precursor.
[0068] (2) The MoS2 piezoelectric catalyst precursor was transferred to a 50 mL reactor and reacted at 200 °C for 24 h. After the reaction was completed, the reaction product was washed three times with anhydrous ethanol and ultrapure water, and dried at 70 °C for 6 h to obtain the MoS2 piezoelectric catalyst.
[0069] Comparison of material characterization between Example 1 and Comparative Examples 1-3:
[0070] like Figure 1 a and Figure 2 As shown in Figure a, the BaTiO3 piezoelectric material exhibits a nanocubic morphology with uniform particle size of approximately 200 nm and a smooth surface free of any impurities.
[0071] In NC@BTO piezoelectric materials, the cubic morphology is retained, but the surface is now covered with a carbon layer approximately 10 nm thick, such as... Figure 1 b and Figure 2 As shown in b.
[0072] like Figure 1 c and Figure 2 As shown in Figure c, the MoS2 piezoelectric catalyst exhibits a sheet-like structure with multiple layers stacked. Subsequently, MoS2 nanosheets are uniformly grown on the carbon layer, ultimately forming a clear three-layer core-shell structure, as shown in Figure c. Figure 1 d、 Figure 2 d、 Figure 3 As shown.
[0073] like Figures 4 to 7 As shown, the successful synthesis of piezoelectric phase BaTiO3 was verified by X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The carbon layer is amorphous carbon, and the loaded MoS2 nanosheets have both 1T and 2H phases, which will be beneficial to electron transfer and carrier separation, thereby improving the piezoelectric catalytic efficiency.
[0074] Application of the materials prepared in Examples 1 and Comparative Examples 1-3 in hydrogen peroxide production:
[0075] Take 100 mg each of MoS2-NC@BTO, NC@BTO, BTO and MoS2 piezoelectric catalysts prepared in Example 1 and Comparative Examples 1-3, add them to 50 mL of deionized water, disperse them evenly, and trigger the piezoelectric catalytic reaction with an ultrasonic power of 200 W. Take samples at regular intervals, filter them through a 0.22 μm polytetrafluoroethylene filter membrane, and determine the concentration of hydrogen peroxide with a UV spectrophotometer. The longest reaction time is 60 min. Three replicate groups are set up for each reaction.
[0076] Experimental results are as follows Figure 8 As shown, the efficiency of NC@BTO and BTO piezoelectric catalysts in producing hydrogen peroxide is very limited, with concentrations of only 24.32 μM and 17.68 μM, respectively, within 60 min. Barium titanate without any modification exhibits limited piezoelectric performance; although the addition of a carbon layer provides some improvement, the effect is still not significant. Furthermore, MoS2 alone does not show better piezoelectric performance, with a hydrogen peroxide concentration of only 28.61 μM within 60 min. Meanwhile, the physical mixture of NC@BTO and MoS2 has a similar hydrogen peroxide production effect to MoS2 alone, indicating that "coreless" grown MoS2 cannot exhibit excellent piezoelectric performance. MoS2-NC@BTO, however, exhibits extremely excellent hydrogen peroxide production, reaching a concentration of 58.24 μM within 60 min. Therefore, the core-shell heterojunction prepared in Example 1 perfectly leverages the advantages of both catalysts, improving hydrogen peroxide yield.
[0077] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.
Claims
1. A method for preparing a hydrogen peroxide producing piezoelectric core-shell heterojunction, characterized by, The process includes the following steps: S1, first, mix NaOH and KOH in an aqueous phase, then add BaCl2·2H2O and TiO2 sequentially to obtain a mixture; S2, subject the mixture in S1 to a hydrothermal reaction to obtain a barium titanate piezoelectric material; S3, subject the barium titanate piezoelectric material in S2 to a polymerization reaction with dopamine hydrochloride to obtain a nitrogen-doped carbon layer-encapsulated barium titanate piezoelectric catalyst; S4, disperse the nitrogen-doped carbon layer-encapsulated barium titanate piezoelectric catalyst, Na2MoO4·2H2O and CH4N2S in an aqueous phase to obtain a piezoelectric core-shell heterojunction precursor; S5, subject the piezoelectric core-shell heterojunction precursor in S4 to a hydrothermal reaction to obtain an in-situ grown molybdenum disulfide piezoelectric core-shell heterojunction.
2. The method of claim 1, wherein the method comprises: The piezoelectric core-shell heterojunction in step S5 has a three-layer core-shell structure with barium titanate as the core, nitrogen-doped carbon layer as the middle layer, and molybdenum disulfide nanosheets as the outer shell.
3. The method of claim 1, wherein the method comprises: In step S1, the mass of both NaOH and KOH is 8-12g, and the mass ratio of NaOH to KOH is 51.5 / 48.5; the aqueous phase is deionized water, and the volume of deionized water is 18-25mL; the amount of BaCl2·2H2O added is 2-2.5mmol; and the amount of TiO2 added is 1-1.5mmol.
4. The method of claim 1, wherein the method comprises: In step S2, the hydrothermal reaction temperature is 180-200℃ and the reaction time is 20-24h; in step S5, the hydrothermal reaction temperature is 180-200℃ and the reaction time is 20-24h.
5. The method of claim 1, wherein the method further comprises: The reaction products of the hydrothermal reaction in step S2, the polymerization reaction in step S3, and the hydrothermal reaction in step S5 were all subjected to the following operations: the reaction products were washed with anhydrous ethanol and ultrapure water, respectively, and then dried.
6. The method of claim 1, wherein the method further comprises: In step S3, 0.5-1 g of barium titanate piezoelectric material is dispersed in a Tris buffer solution with a concentration of 10-20 mmol / L and a pH ≥ 8.5; and 0.05-0.1 g of dopamine hydrochloride is added.
7. The method of claim 1, wherein the method further comprises: In step S4, the amount of nitrogen-doped carbon layer-coated barium titanate piezoelectric catalyst added is 0.5-1g; the aqueous phase is deionized water, and the volume of deionized water is 20-30mL; the amount of Na2MoO4·2H2O added is 10-20mmol; and the amount of CH4N2S added is 40-80mmol.
8. A hydrogen peroxide producing piezoelectric core-shell heterojunction, characterized in that, It is prepared by any one of the preparation methods described in claims 1 to 7.
9. Use of a piezoelectric core-shell heterojunction according to claim 8 for the production of hydrogen peroxide, characterized in that, The application method is as follows: the piezoelectric core-shell heterojunction is dispersed in deionized water and subjected to a piezoelectric catalytic reaction under ultrasonic excitation to generate hydrogen peroxide.
10. Use of a piezoelectric core-shell heterojunction according to claim 9 for the production of hydrogen peroxide, characterized in that: The amount of piezoelectric core-shell heterojunction added is 0.25-1 g / L, the volume of deionized water is 50-80 mL, the ultrasonic power is 40-300 W, and the reaction time is 10-60 min.