MnO2@MoS2 / RGO electrode material and preparation method and application thereof

Abstract

The application provides a MnO2@MoS2 / RGO electrode material and a preparation method and application thereof, and belongs to the technical field of electrode material preparation; in the application, reduced graphene oxide (RGO) and MnO2 with a sheet structure are compounded to obtain MoS2 / RGO, and then hollow MnO2 nanospheres are compounded to obtain the MnO2@MoS2 / RGO electrode material; the MnO2@MoS2 / RGO electrode material solves the agglomeration problem of MnO2 through secondary structure recombination, MnO2 is uniformly dispersed between the sheets to form a rich conductive network, and the close contact between the composite materials is ensured; the MnO2@MoS2 / RGO electrode material has high specific capacitance, and has a good application prospect in the fields of supercapacitors, micro-nano electronic devices, solar cell electrodes and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrode material preparation, and particularly relates to a MnO2@MoS2 / RGO electrode material and a preparation method and application thereof. BACKGROUND

[0002] Due to the consumption of traditional energy, a series of problems such as energy depletion and environmental pollution occur, and it is necessary to develop energy storage devices with high specific capacitance, high energy density, longer cycle life, and green low carbon. In recent years, supercapacitors have great potential in the application of energy storage devices due to their long cycle stability, high current density and high energy density.

[0003] Graphene has excellent high conductivity, large specific surface area and other properties, and has potential value in improving the electrochemical performance of supercapacitors, so graphene composite materials can be used as an ideal electrode material for supercapacitors. In recent years, there have been many studies on graphene "1+1" composite materials, i.e. graphene composite materials with another material, but there are still problems such as low specific capacitance, poor dispersibility and the like, which affect the transmission of electrons, further causing low electrochemical performance and limiting their application in supercapacitors.

[0004] MnO2 is a graphene-like material composed of two S layers and a metal Mo layer sandwiched between the two sulfur S layers, and the layers interact with each other by weak van der Waals force, and has the advantages of low cost, non-toxicity, excellent ion storage performance, high theoretical capacity (1370 F / g), and becomes one of the most promising electrode materials. However, due to the low conductivity of MnO2, its capacitance cannot reach the theoretical prediction value, which limits its application as a supercapacitor electrode material.

[0005] In the prior art, an electrode material with a layer-by-layer structure of single-layer or few-layer graphene and single-layer molybdenum disulfide is obtained by electrostatic adsorption self-assembly, or a binary mixed molybdenum cobalt sulfide nanosheet modified on reduced graphene oxide is used as a high-performance supercapacitor electrode. However, it still has the shortcomings of poor dispersibility of the material and low specific capacitance. SUMMARY

[0006] In view of the deficiencies in the prior art, the application provides a MnO2@MoS2 / RGO electrode material and a preparation method and application thereof.In the application, MoS2 / RGO is obtained by compounding reduced graphene oxide (RGO) and MnO2 with a sheet structure, and then hollow MnO2 nanospheres are compounded to obtain the MnO2@MoS2 / RGO electrode material; the MnO2@MoS2 / RGO electrode material solves the agglomeration problem of MnO2 through secondary structure recombination, MnO2 is uniformly dispersed between the sheet layers to form a rich conductive network, and the close contact between the composite materials is ensured; the MnO2@MoS2 / RGO electrode material has high specific capacitance and has good application prospects in the fields of supercapacitors, micro-nano electronic devices, solar cell electrodes and the like.

[0007] In the application, the MnO2@MoS2 / RGO electrode material is first provided; in the MnO2@MoS2 / RGO electrode material, graphene is a two-dimensional wrinkled sheet, MoS2 with a nanoflower shape is uniformly grown between graphene sheet layers, and hollow MnO2 nanospheres are grown between MoS2 / RGO sheet layers through hydrothermal synthesis, recombination with the MoS2 / RGO structure, and formation of the MnO2@MoS2 / RGO electrode material with a sandwich structure.

[0008] The application also provides a preparation method of the above MnO2@MoS2 / RGO electrode material, and specifically comprises the following steps:

[0009] (1) Preparation of GO:

[0010] Concentrated H2SO4 and H3PO4 are stirred and uniformly mixed, graphite powder is added and uniformly mixed, then KMnO4 is added in batches, and stirring is performed under an ice water bath condition; after the reaction is completed, a reaction solution is obtained; deionized water and H2O2 are added to the reaction solution, the reaction solution becomes yellow brown, and a precipitate is obtained; the precipitate is washed and dried to obtain GO;

[0011] (2) Preparation of MoS2 / RGO:

[0012] GO is ultrasonically dispersed in deionized water, then a surfactant aqueous solution, MoO3 and KSCN are added thereto, stirring and uniform mixing are performed, and then a hydrothermal reaction is performed; after the reaction is completed, a precipitate is obtained; the precipitate is washed and dried to obtain MoS2 / RGO;

[0013] (3) Preparation of the MnO2@MoS2 / RGO electrode material:

[0014] MoS2 / RGO is dispersed in deionized water, then KMnO4 and HCl are added and uniformly stirred and mixed, then a hydrothermal reaction is performed; after the reaction is completed, a precipitate is obtained; the precipitate is washed and dried to obtain the MnO2@MoS2 / RGO electrode material.

[0015] Further, in step (1), the amount ratio of concentrated H2SO4, H3PO4, graphite powder, KMnO4, deionized water and H2O2 is 12 mL:1 mL:1 g:1 g:200 ml:8 ml~1 mL:1 mL:4 g:8 g:300 ml:5 ml;

[0016] The concentration of H2O2 is 7~10 mol / L.

[0017] The stirring reaction condition is 18-26h.

[0018] Further, in step (2), the amount ratio of GO, deionized water, surfactant, MoO3 and KSCN is 0.01~0.04g:40~80mL:3~6mmol:1~3mmol:0.3~0.6mmol;

[0019] The surfactant includes any one of sodium dodecyl benzene sulfonate, sodium tetrapolypropylene benzene sulfonate, sodium diisooctyl succinate sulfonate and sodium dibutyl naphthalene sulfonate;

[0020] The hydrothermal reaction condition is 16~28h at 180~240 DEG C.

[0021] Further, in step (3), the amount range of MoS2 / RGO, deionized water, KMnO4 and HCl is 5~20mg:50~100mL:5.5~8.5mmol:0.01~0.1mmol;

[0022] The hydrothermal reaction condition is 8~16h at 130~180 DEG C.

[0023] The application also provides the application of the above-mentioned MnO2@MoS2 / RGO electrode material in preparing supercapacitors, micro-nano electronic devices and solar cell electrodes.

[0024] Compared with the prior art, the application has the beneficial effects that:

[0025] In the application, hollow MnO2 nanospheres are hydrothermally synthesized on a MoS2 / RGO substrate, and through secondary structure recombination, MnO2 hydrothermally grown is dispersed between the layers, the MoS2 / RGO layer spacing is increased, the agglomeration problem of the previously synthesized MnO2 is solved, the spherical MnO2 and the MoS2 / RGO layers form a rich conductive network, the full and close contact between the composite materials is ensured, the three materials synergize, and the dispersity and specific capacitance of the material are improved.

[0026] The prepared MnO2@MoS2 / RGO electrode material, the 'hollow' MnO2 nanomicrospheres increase the active surface area, provide abundant channels for chemical reaction, and the hollow structure is more conducive to the transfer and transportation of electrolyte ions; the '2+1' type electrode material formed by structure recombination has more conductive networks, thereby the ion diffusion rate can be improved, the charge transfer is accelerated, and the specific capacitance of the composite material is greatly improved, and the specific capacitance can reach 783 F g -1 .

[0027] The preparation method of the MnO2@MoS2 / RGO electrode material in the application is simple, efficient, low in cost, light in mass, and high in specific capacitance of the prepared electrode material, and has a good application prospect in the fields of micro-nano electronic devices, solar cell electrodes and the like. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a scanning electron microscope graph of the MnO2@MoS2 / RGO electrode material.

[0029] Figure 2 It is a Raman spectrum graph of the MnO2@MoS2 / RGO electrode material.

[0030] Figure 3 It is a transmission electron microscope graph of the MnO2@MoS2 / RGO electrode material.

[0031] Figure 4 It is an electrochemical test result graph of the MnO2@MoS2 / RGO electrode material of Example 1.

[0032] Figure 5 It is an electrochemical test result graph of the MnO2@MoS2 / RGO electrode material of Example 2.

[0033] Figure 6 It is an electrochemical test result graph of the MnO2@MoS2 / RGO electrode material of Example 3.

[0034] Figure 7 It is an electrochemical test result graph of the MnO2@MoS2 / RGO electrode material of Example 4.

[0035] Figure 8 It is an electrochemical test result graph of the MnO2@MoS2 / RGO electrode material of Example 5.

[0036] Figure 9 It is an electrochemical test result graph of the MnO2@MoS2 / RGO electrode material of Example 6. DETAILED DESCRIPTION

[0037] The application will be further described below in combination with the drawings and specific embodiments, but the protection scope of the application is not limited thereto.

[0038] (1) Preparation of GO:

[0039] In the reactor, 240 mL of concentrated H2SO4 and 27 mL of H3PO4 were stirred for 30 min and mixed uniformly, then 1.5 g of graphite powder was added, and 0.04 mol of KMnO4 was added in batches, and the reaction was stirred for 24 h under the condition of ice water bath. After the reaction was completed, 220 mL of deionized water below 5°C was added to the reaction solution, and then 0.03 mol of H2O2 was added. The color of the reaction solution changed to yellow brown instantaneously, and a precipitate was obtained. The precipitate was washed with distilled water and freeze-dried for 12 h to obtain GO.

[0040] (2) Preparation of MoS2 / RGO:

[0041] 0.02 g of GO was ultrasonically dispersed in 50 mL of deionized water, and then 5 mmol of sodium dodecylbenzenesulfonate, 2 mmol of MoO3 and 0.5 mmol of KSCN were added to the solution, and stirred for 20 min. Then, the above mixed solution was reacted in a high-pressure reaction kettle at 220°C for 24 h to obtain a precipitate. The precipitate was washed with deionized water and freeze-dried for 12 h to obtain MoS2 / RGO.

[0042] (3) Preparation of MnO2@MoS2 / RGO electrode material:

[0043] 10 mg of MoS2 / RGO was ultrasonically dispersed in 70 mL of deionized water, and then 7 mmol of KMnO4 and 0.07 mmol of HCl were added thereto and stirred to mix uniformly. Then, the mixed solution mixed uniformly was hydrothermally reacted at 150°C for 12 h. After the reaction was completed, a precipitate was obtained, which was washed with deionized water and freeze-dried for 12 h to obtain the MnO2@MoS2 / RGO electrode material.

[0044] Figure 1 The scanning electron microscope image of the MnO2@MoS2 / RGO electrode material is shown in the figure. As can be seen from the figure, RGO is a two-dimensional wrinkled sheet structure, and the dispersibility between the materials is good. MoS2 and MnO2 are hydrothermally synthesized between the RGO sheet layers to perform 2 times of structure recombination.

[0045] Figure 2 The Raman spectrum of the MnO2@MoS2 / RGO electrode material is shown in the figure. As can be seen from the figure, the characteristic peaks of MnO2, MoS2 and RGO are shown, which indicates the successful preparation of the MnO2@MoS2 / RGO electrode material. In addition, it can also be seen from the figure that the relative value of the peak changes, which indicates that the interlayer spacing of the electrode material after structure recombination is increased.

[0046] Figure 3The transmission electron microscope image of the MnO2@MoS2 / RGO electrode material is shown in the figure. It can be seen from the figure that the graphene is a two-dimensional wrinkled sheet, the nanoflower-like MoS2 is uniformly grown between the graphene sheet layers, the hollow MnO2 is grown between the MoS2 / RGO sheet layers by hydrothermal synthesis and reorganizes with the MoS2 / RGO structure, forming the MnO2@MoS2 / RGO electrode material with a sandwich structure.

[0047] The electrochemical performance of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrode materials was investigated by specific capacitance test in this embodiment, and the test results are shown in the figure. Figure 4

[0048] Figure 4 The electrochemical test result figure of the MnO2@MoS2 / RGO electrode material is shown in the figure. It can be seen from the figure that, compared with GO and MoS2 / RGO, the MnO2@MoS2 / RGO electrode has a significantly longest discharge time. When the scanning speed is 1A g -1 , the specific capacitances of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes are 94F g -1 , 412F g -1 , and 738F g -1 , respectively. It can be seen that the discharge time of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes gradually becomes longer, and the specific capacitance is improved to 738F g -1 . The electrochemical performance is obviously improved. The main reason is that the secondary structure reorganization between MoS2, RGO and MnO2 forms a conductive network, which improves the overall specific capacitance.

[0049] Example 2:

[0050] (1) Preparation of GO:

[0051] In the reactor, 120 mL of concentrated H2SO4 and 80 mL of H3PO4 were stirred for 30 min and mixed uniformly, then 4 g of graphite powder was added, and 0.06 mol of KMnO4 was added in batches. Stirring was carried out under ice water bath condition for 24 h. After the reaction was completed, 300 mL of deionized water below 5℃ was added to the reaction liquid, and then 0.04 mol of H2O2 was added. The color of the reaction liquid changed to yellow brown instantaneously, and a precipitate was obtained. The precipitate was washed with distilled water and freeze-dried for 12 h to obtain GO.

[0052] (2) Preparation of MoS2 / RGO:

[0053] ​Take 0.04g GO ultrasonic dispersion in 80mL deionized water, then add 5mmol of sodium tetrapolypropylene benzene sulfonate aqueous solution, 6mmol of MoO3 and 3mmol of KSCN, stir for 20min, then in a high-pressure reactor, the above mixed solution is reacted at 240℃ for 28h, the precipitate is obtained, then the precipitate is washed with deionized water, freeze-dried for 12h, and MoS2 / RGO is obtained.

[0054] (3) Preparation of MnO2@MoS2 / RGO electrode material:

[0055] Ultrasonic dispersion of 20mg MoS2 / RGO in 100mL deionized water, then add 8.5mmol of KMnO4 and 0.1mmol of HCl, stir and mix evenly, then the mixed solution is hydrothermally reacted at 180℃ for 16h, after the reaction is completed, the precipitate is obtained, washed with deionized water, freeze-dried for 12h, and the MnO2@MoS2 / RGO electrode material is obtained, and the electrochemical performance test results of the MnO2@MoS2 / RGO electrode material are shown in Figure 5 .

[0056] Figure 5 The electrochemical test results of the MnO2@MoS2 / RGO electrode material are shown in the figure, from which it can be seen that when the scanning speed is 1A g -1 , the specific capacitances of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes are 86F g -1 , 365F g -1 , 537F g -1 , it can be seen that the discharge time of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes gradually increases, and the specific capacitance increases to 537F g -1 .

[0057] Example 3:

[0058] (1) Preparation of GO:

[0059] In the reactor, 100mL of concentrated H2SO4 and 100mL of H3PO4 are stirred for 30min and mixed evenly, then 2g of graphite powder is added, and 2g of KMnO4 is added in batches, and stirred under ice water bath conditions for 24h, after the reaction is completed, 200mL of deionized water below 5℃ is added to the reaction solution, and then 0.01mol of H2O2 is added, the color of the reaction solution changes to yellow brown instantaneously, and the precipitate is obtained, washed with distilled water, and freeze-dried for 12h to obtain GO.

[0060] (2) Preparation of MoS2 / RGO:

[0061] Take 0.01g GO ultrasonic dispersion in 40mL deionized water, then add 3mmol of sodium diisooctyl sulfosuccinate aqueous solution, 1mmol of MoO3 and 0.3mmol of KSCN, stir for 20min, then in a high-pressure reactor, the above mixed solution is reacted at 180℃ for 16h, the precipitate is obtained, then the precipitate is washed with deionized water, freeze-dried for 12h, and MoS2 / RGO is obtained.

[0062] (3) Preparation of MnO2@MoS2 / RGO electrode material:

[0063] Ultrasonic dispersion of 5mg MoS2 / RGO in 50mL deionized water, then add 5.5mmol of KMnO4 and 0.01mmol of HCl, stir and mix evenly, then the mixed solution is hydrothermally reacted at 130℃ for 8h, after the reaction is completed, the precipitate is obtained, washed with deionized water, freeze-dried for 12h, and the MnO2@MoS2 / RGO electrode material is obtained, and the electrochemical performance test results of the MnO2@MoS2 / RGO electrode material are shown in Figure 6 .

[0064] Figure 6 The electrochemical test results of the MnO2@MoS2 / RGO electrode material are shown in the figure, and it can be seen from the figure that when the scanning speed is 1Ag -1 , the specific capacitances of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes are 68F g -1 , 248F g -1 , 431F g -1 , it can be seen that the discharge time of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes gradually increases, and the specific capacitance increases to 431F g -1 .

[0065] Example 4:

[0066] (1) Preparation of GO:

[0067] In the reactor, 200mL of concentrated H2SO4 and 40mL of H3PO4 are stirred for 30min, then 2g of graphite powder is added, and then 0.04mol of KMnO4 is added in batches, and the reaction is stirred for 24h under ice water bath condition, then 180mL of deionized water below 5℃ is added to the reaction solution, and then 0.05mol of H2O2 is added, the color of the reaction solution changes to yellow brown instantaneously, the precipitate is obtained, washed with distilled water, and freeze-dried for 12h to obtain GO.

[0068] (2) Preparation of MoS2 / RGO:

[0069] Take 0.05g GO ultrasonic dispersion in 60mL deionized water, then add 5mmol of sodium dodecyl benzene sulfonate aqueous solution, 2mmol of MoO3 and 0.5mmol of KSCN to it, stir for 20min, then, in a high-pressure reaction kettle, the above mixed solution is reacted at 200℃ for 24h, the precipitate is obtained, then the precipitate is washed with deionized water, freeze-dried for 12h, and MoS2 / RGO is obtained.

[0070] (3) Preparation of MnO2@MoS2 / RGO electrode material:

[0071] 8mg MoS2 / RGO is ultrasonically dispersed in 70mL deionized water, then 7mmol of KMnO4 and 0.08mmol of HCl are added to it, and the mixture is stirred and mixed uniformly, then the uniformly mixed mixture is hydrothermally reacted at 170℃ for 12h, and after the reaction is completed, the precipitate is obtained, washed with deionized water, and freeze-dried for 12h to obtain the MnO2@MoS2 / RGO electrode material, and the electrochemical performance test results of the MnO2@MoS2 / RGO electrode material are shown in Figure 7 .

[0072] Figure 7 The electrochemical test results of the MnO2@MoS2 / RGO electrode material are shown in the figure, and it can be seen from the figure that when the scanning speed is 1A g -1 , the specific capacitances of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes are 91F g -1 , 384F g -1 , 627F g -1 , it can be seen that the discharge time of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes gradually increases, and the specific capacitance increases to 627F g -1 .

[0073] Example 5:

[0074] (1) Preparation of GO:

[0075] 160mL of concentrated H2SO4 and 27mL of H3PO4 are added to the reactor and stirred for 30min to mix uniformly, then 1.5g of graphite powder is added, and 0.04mol of KMnO4 is added in batches, and stirred under ice water bath conditions for 24h, then 220mL of deionized water below 5℃ is added to the reaction solution, and 0.03mol of H2O2 is added, the color of the reaction solution changes to yellow brown instantaneously, the precipitate is obtained, washed with distilled water, and freeze-dried for 12h to obtain GO.

[0076] (2) Preparation of MoS2 / RGO:

[0077] Take 0.04g GO ultrasonic dispersion in 50mL deionized water, then add 5mmol of sodium dodecyl benzene sulfonate aqueous solution, 3mmol of MoO3 and 0.4mmol of KSCN, stir for 20min, then in a high pressure reactor, the above mixed solution is reacted at 220℃ for 20h, the precipitate is obtained, then the precipitate is washed with deionized water, freeze-dried for 12h, MoS2 / RGO is obtained.

[0078] (3) Preparation of MnO2@MoS2 / RGO electrode material:

[0079] Ultrasonic dispersion of 10mg MoS2 / RGO in 70mL deionized water, then add 7mmol of KMnO4 and 0.07mmol of HCl, stir and mix evenly, then the mixed solution is hydrothermally reacted at 170℃ for 12h, after the reaction is completed, the precipitate is obtained, washed with deionized water, freeze-dried for 12h, the MnO2@MoS2 / RGO electrode material is obtained, the electrochemical performance test results of the MnO2@MoS2 / RGO electrode material are shown in Figure 8 .

[0080] Figure 8 The electrochemical test results of the MnO2@MoS2 / RGO electrode material are shown in the figure, it can be seen from the figure that when the scanning speed is 1Ag -1 , the specific capacitances of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes are 90F g -1 , 399F g -1 , 671F g -1 , it can be seen that the discharge time of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes gradually increases, and the specific capacitance increases to 671F g -1 .

[0081] Example 6:

[0082] (1) Preparation of GO:

[0083] In the reactor, 170mL of concentrated H2SO4 and 15mL of H3PO4 are added and stirred for 30min, then 2.5g of graphite powder is added, and then 0.04mol of KMnO4 is added in batches, and stirred under ice water bath condition for 24h, after the reaction is completed, 220mL of deionized water below 5℃ is added to the reaction solution, and then 0.03mol of H2O2 is added, the color of the reaction solution changes to yellow brown instantaneously, the precipitate is obtained, washed with distilled water, freeze-dried for 12h, and GO is obtained.

[0084] (2) Preparation of MoS2 / RGO:

[0085] Take 0.02g GO ultrasonic dispersion in 50mL deionized water, then add 5mmol of sodium dodecyl benzene sulfonate aqueous solution, 3mmol of MoO3 and 0.8mmol of KSCN to it, stir for 20min, then, in a high-pressure reaction kettle, the above mixed solution is reacted at 220℃ for 24h, the precipitate is obtained, then the precipitate is washed with deionized water, freeze-dried for 12h, and MoS2 / RGO is obtained.

[0086] (3) Preparation of MnO2@MoS2 / RGO electrode material:

[0087] 8mg MoS2 / RGO is ultrasonic dispersed in 60mL deionized water, then 5mmol of KMnO4 and 0.07mmol of HCl are added to it, and the mixture is stirred and mixed uniformly, then the mixed solution after uniform mixing is hydrothermally reacted at 180℃ for 12h, and after the reaction is completed, the precipitate is obtained, washed with deionized water, and freeze-dried for 12h to obtain the MnO2@MoS2 / RGO electrode material, and the electrochemical performance test results of the MnO2@MoS2 / RGO electrode material are as shown in Figure 9 .

[0088] Figure 9 The electrochemical test results of the MnO2@MoS2 / RGO electrode material are shown in the figure, and it can be seen from the figure that when the scanning speed is 1Ag -1 , the specific capacitances of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes are 83F g -1 , 381F g -1 , 566F g -1 , it can be seen that the discharge time of GO, MoS2 / RGO and MnO2@MoS2 / RGO electrodes gradually increases, and the specific capacitance is increased to 566F g -1 .

[0089] In summary, in the present application, MoS2 and graphene are selected for structural recombination, the dispersibility is improved, and the specific surface area of the material is increased. At the same time, hollow MnO2 is grown on the MoS2 / RGO substrate by hydrothermal growth method, and the secondary structural recombination of “2” and “1” is carried out, and the dispersibility problem between the composite materials is solved again by intercalation, a conductive network is formed, and the electrochemical performance of the electrode material is improved. The “2+1” type hollow MnO2@MoS2 / RGO electrode material prepared by this method has a synergistic effect, and plays its own advantages, so that the material becomes a promising supercapacitor electrode material.

[0090] The above embodiments are preferred embodiments of the present application, but the present application is not limited to the above embodiments, and any obvious improvement, replacement or modification made by those skilled in the art without departing from the spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A method for preparing a MnO2@MoS2 / RGO electrode material, characterized in that: include: (1) Preparation of MoS2 / RGO: GO was ultrasonically dispersed in deionized water, and then a surfactant aqueous solution, MoO3, and KSCN were added thereto. After stirring and mixing, a hydrothermal reaction was carried out. After the reaction, a precipitate was obtained, which was washed and dried to obtain MoS2 / RGO. (2) Preparation of MnO2@MoS2 / RGO electrode materials: MoS2 / RGO is dispersed in deionized water, and then KMnO4 and HCl are added and stirred to mix evenly, followed by hydrothermal reaction. After the reaction is completed, a precipitate is obtained, which is washed and dried to obtain MnO2@MoS2 / RGO electrode material.

2. The method for preparing the MnO2@MoS2 / RGO electrode material according to claim 1, characterized in that: The preparation method of GO includes: Concentrated H2SO4 and H3PO4 were stirred and mixed evenly, graphite powder was added and mixed evenly, and then KMnO4 was added in batches. The mixture was stirred and reacted under ice-water bath conditions. After the reaction was completed, a reaction liquid was obtained. Deionized water and H2O2 were added to the reaction liquid. The reaction liquid turned yellow-brown and a precipitate was obtained. The precipitate was washed and dried to obtain GO.

3. The method for preparing the MnO2@MoS2 / RGO electrode material according to claim 2, wherein: The usage ratio of concentrated H2SO4, H3PO4, graphite powder, KMnO4, deionized water and H2O2 is 12mL:1mL:1g:1g:200ml:8ml~1mL:1mL:4g:8g:300ml:5ml; The concentration of H2O2 is 7-10 mol / L; The stirring reaction condition is 18-26h.

4. The method for preparing the MnO2@MoS2 / RGO electrode material according to claim 1, wherein: In step (1), the usage ratio of GO, deionized water, surfactant, MoO3 and KSCN is 0.01~0.04g:40~80mL:3~6mmol:1~3mmol:0.3~0.6mmol.

5. The method for preparing the MnO2@MoS2 / RGO electrode material according to claim 4, characterized in that: The surfactant is any one of sodium dodecylbenzenesulfonate, sodium dioctyl sulfosuccinate, and sodium dibutylnaphthalenesulfonate.

6. The method for preparing the MnO2@MoS2 / RGO electrode material according to claim 4, characterized in that: In step (1), the hydrothermal reaction is carried out at 180-240° C. for 16-28 hours.

7. The method for preparing the MnO2@MoS2 / RGO electrode material according to claim 1, wherein: In step (2), the ratio of MoS2 / RGO, deionized water, KMnO4 and HCl is 5~20 mg:50~100 mL:5.5~8.5 mmol:0.01~0.1 mmol.

8. The method for preparing the MnO2@MoS2 / RGO electrode material according to claim 1, wherein: In step (2), the hydrothermal reaction is carried out at 130-180° C. for 8-16 hours.

9. The MnO2@MoS2 / RGO electrode material prepared by the method according to any one of claims 1 to 8, characterized in that In the MnO2@MoS2 / RGO electrode material, graphene is in the form of two-dimensional wrinkled sheets, nanoflower-shaped MoS2 grows evenly between the graphene sheets, and hollow MnO2 microspheres grow between the MoS2 / RGO sheets through hydrothermal synthesis.

10. Use of the MnO2@MoS2 / RGO electrode material according to claim 9 in the preparation of supercapacitors, micro-nanoelectronic devices, and solar cell electrodes.

Images