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Molybdenum disulfide/graphene hollow composite microsphere and preparation method therefor

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

Active Publication Date: 2016-11-16
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 200Fg. -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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  • Molybdenum disulfide/graphene hollow composite microsphere and preparation method therefor
  • Molybdenum disulfide/graphene hollow composite microsphere and preparation method therefor
  • Molybdenum disulfide/graphene hollow composite microsphere and preparation method therefor

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Embodiment 1

[0033] Embodiment 1: the method provided by the invention is used to prepare molybdenum disulfide / graphene hollow composite microspheres ( figure 1 ):

[0034] (1) Using a slightly improved Silica colloidal microspheres with an average particle size of 200nm [(a) Wang, W.; Gu, B.; Liang, L.; Hamilton, W.A.J.Phys.Chem.B2003, 107, 3400-3404.(b ) Wang, W.; Gu, B.; Liang, L.; Hamilton, W. A. ​​J. Phys. Chem. B2003, 107, 12113-12117.].

[0035] (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.).

[0036] (3) 80 mg of the silica / graphene oxide composite microspheres in step (2) were ultrasonically dispersed in 55 mL of water, and then 5 mL of an aqueous solution containing 155 mg of sodium molybdate dihyd...

Embodiment 2

[0040] 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:

[0041] (1) Weigh 40 mg of molybdenum disulfide / graphene hollow composite microspheres synthesized in Example 1, 5 mg of acetylene black and 5 mg of polyvinylidene fluoride and mix them into an agate mortar, then add 350 μL of N-formazan base pyrrolidone and fully grind it into a slurry, and then evenly coat the slurry on the surface of nickel foam, the coating area is 1cm×1cm, and then put the nickel foam coated with active material into a vacuum drying oven at 60°C Fully dry for more than 6 hours to obtain the working electrode.

[0042] (2) be coated with the foamed nickel of active material in step (1) as working electrode, Hg / HgO electrode is as reference electrode, and Pt sheet electrode is as auxiliary electrode and is the potassium hydroxide aqueous solution of 2M as elec...

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Abstract

The invention relates to a molybdenum disulfide / graphene hollow composite microsphere with a layered porous hollow microsphere-shaped structure, and a synthetic method for the molybdenum disulfide / graphene hollow composite microsphere, and belongs to the technical field of micro-nano composite material preparation and synthesis. The method comprises the steps: firstly preparing a silicon oxide microsphere; secondly assembling a positive ion polyelectrolyte layer on the surface of the silicon oxide microsphere, and enabling the silicon oxide microsphere to be positively electrified; thirdly assembling a oxidized graphene layer on the surface of the positively electrified silicon oxide microsphere, and obtaining a silicon oxide / oxidized graphene composite microsphere; fourthly depositing and growing a molybdenum disulfide nanosheet on the surface of the silicon oxide / oxidized graphene composite microsphere through employing a hydrothermal method, reducing the wrapped oxidized graphene to graphene at the same time, and then obtaining a silicon oxide / graphene / molybdenum disulfide composite microsphere; finally removing a silicon oxide core through employing the hydrothermal method and excessive hydrofluoric acid, and forming the molybdenum disulfide / graphene hollow composite microsphere through synthesis. When the composite microsphere serves as the electrode material of a supercapacitor, the microsphere is large in specific capacitance, is excellent in circulating charging and discharging stability, and presents a good application prospect.

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 disul...

Claims

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Application Information

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