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A kind of molybdenum disulfide/graphene hollow composite microsphere and preparation method thereof

A technology of molybdenum disulfide and composite microspheres, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors, can solve problems such as poor conductivity, unsatisfactory stability, and limited specific capacitance, and achieve favorable Effects of diffusion and transport, excellent electrochemical performance, and good electrical conductivity

Active Publication Date: 2018-03-30
芽米科技(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these reported molybdenum disulfide-based materials are used as supercapacitor electrode materials, their specific capacitance is very limited, and it is often difficult to exceed 200 F g ‒1 , and the stability is often unsatisfactory
The reason lies in the poor conductivity of molybdenum disulfide itself and the low specific surface area caused by the easy aggregation of layered molybdenum disulfide during the material preparation process, which greatly limits the electron transport and the diffusion of electrolyte ions during charge and discharge. , thereby affecting the electrochemical performance of the material

Method used

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  • A kind of molybdenum disulfide/graphene hollow composite microsphere and preparation method thereof
  • A kind of molybdenum disulfide/graphene hollow composite microsphere and preparation method thereof
  • A kind of molybdenum disulfide/graphene hollow composite microsphere and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: the method provided by the invention is used to prepare molybdenum disulfide / graphene hollow composite microspheres ( figure 1 ):

[0035] (1) Silica colloidal microspheres with an average particle size of 200 nm were prepared by a slightly improved Stöber method [(a) Wang, W.; Gu, B.; Liang, L.; Hamilton, W. A. J. Phys. Chem. B 2003, 107 , 3400-3404. (b) Wang, W.; Gu, B.; Liang, L.; Hamilton, W. A. J. Phys. Chem. B 2003, 107 , 12113-12117.].

[0036] (2) A layer of graphene oxide was modified on the surface of the silica microspheres prepared in step (1) by means of ultrasonic-assisted interfacial self-assembly to obtain silica / graphene oxide composite microspheres with an average size of 200 nm ( Xiao, W.; Zhang, Y.; Liu, B. ACS Appl. Mater. Interfaces 2015, 7 , 6041-6046.).

[0037] (3) Ultrasonic disperse 80 mg of the silica / graphene oxide composite microspheres in step (2) in 55 mL of water, and then add dropwise 5 mL of 155 mg of sodium mo...

Embodiment 2

[0041] Embodiment 2: The molybdenum disulfide / graphene hollow composite microsphere synthesized in embodiment 1 is used as a supercapacitor electrode material to test its electrochemical performance:

[0042] (1) Weigh 40 mg molybdenum disulfide / graphene hollow composite microspheres synthesized in Example 1, 5 mg acetylene black and 5 mg polyvinylidene fluoride respectively and mix them into an agate mortar, then add 350 μL of N-methylpyrrolidone and fully ground into a slurry, and then the slurry was evenly coated on the surface of the nickel foam, the coating area was 1 cm × 1 cm, and then the nickel foam coated with the active material was put into Vacuum oven, 60 o C and fully dried for more than 6 h to obtain the working electrode.

[0043] (2) The nickel foam coated with the active material in step (1) is used as the working electrode, the Hg / HgO electrode is used as the reference electrode, the Pt sheet electrode is used as the auxiliary electrode and the potassium hy...

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Abstract

The invention relates to a molybdenum disulfide / graphene composite material with a hierarchical porous hollow microsphere structure and a synthesis method thereof, belonging to the technical field of preparation and synthesis of micro-nano composite materials. First prepare silica microspheres; then assemble a layer of cationic polyelectrolyte on its surface to positively electrify it; then assemble a layer of graphene oxide on the surface of positively electrified silica microspheres to obtain a silica / graphene oxide composite Microspheres; then use the hydrothermal method to deposit and grow molybdenum disulfide nanosheets on its surface, and at the same time reduce the coated graphene oxide to graphene to obtain silica / graphene / molybdenum disulfide composite microspheres; finally, Molybdenum disulfide / graphene hollow composite microspheres were synthesized by removing the silicon dioxide inner core with excess hydrofluoric acid by hydrothermal method. When the composite material is used as a supercapacitor electrode material, it has a large specific capacitance and excellent cycle charge-discharge stability, showing broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of preparation and synthesis of micro-nano composite materials, and in particular relates to a molybdenum disulfide / graphene composite material having a hollow microsphere structure and a preparation method thereof, which is used as an electrode material of a supercapacitor. Background technique [0002] Due to their excellent physicochemical properties, layered transition metal dichalcogenides such as molybdenum disulfide, vanadium disulfide, tin disulfide, tungsten disulfide, etc. have received more and more attention in the field of supercapacitors. In particular, molybdenum disulfide-based composite materials have become a hot spot in current research and development. Many MoS2-based supercapacitor electrode materials with different structures and morphologies such as flower-like MoS2 nanospheres, mesoporous MoS2 nanomaterials, MoS2 hollow microspheres, MoS2 nanoclusters, MoS2 / carbon, molybdenum disulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/86
CPCY02E60/13
Inventor 肖巍周文杰张艳华
Owner 芽米科技(广州)有限公司
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