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High-concentration molybdenum disulfide nanometer sheet dispersion liquid, and preparation method and application thereof

A nano-dispersion, molybdenum disulfide technology, applied in the direction of molybdenum sulfide, electrodes, electrical components, etc., can solve the problems of poor stability, easy agglomeration of molybdenum sulfide nanosheets, etc., and achieve an easy-to-operate, suitable for large-scale, effective and fast preparation method Effect

Inactive Publication Date: 2017-04-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-concentration molybdenum disulfide nanosheet dispersion and its preparation method and application. The method is easy to operate, the reaction temperature is low, the preparation process is environmentally friendly, the product quality is good, the performance is stable, the process is simple, It has good reproducibility and is easy to implement. A high-concentration molybdenum sulfide dispersion with excellent electrochemical properties is prepared, which solves the problem that the molybdenum sulfide nanosheets prepared by the prior art are easy to agglomerate and has poor stability, and expands the use of molybdenum disulfide in Applications in hydrogen evolution and applications in electrochemistry

Method used

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  • High-concentration molybdenum disulfide nanometer sheet dispersion liquid, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Add 2 g of molybdenum sulfide (molybdenite) to 1000 ml of N-vinylpyrrolidone, use an experimental cell pulverizer for continuous ultrasonication for 8 hours (the ultrasonic program is 7 seconds at work, 3 seconds at intervals), and the supernatant is taken Liquid centrifugation to obtain a uniform dispersion, which is molybdenum sulfide nanosheets; wherein, the concentration of the dispersion is 0.6mg / ml;

[0033] (2) Take the above dispersion, centrifuge at 8000 rpm for 20 minutes, pour off the upper suspension, add N-vinylpyrrolidone and re-sonicate for 30 minutes to disperse evenly;

[0034] (3) Take the above-mentioned dispersion and centrifuge at a speed of 1500 rpm for 20 minutes, and take the upper layer suspension to be the molybdenum sulfide nanosheet dispersion.

[0035] (4) Take the above-mentioned dispersion liquid by suction filtration, wash with 30mL deionized water and 30mL ethanol alternately for 3 times and then wash with 150mL deionized water to ob...

Embodiment 2

[0043] (1) Add 3g of molybdenum sulfide ore (molybdenite) to 800 ml of dimethylformamide, use an experimental ultrasonic cleaning machine to ultrasonicate for 8 hours (the ultrasonic program is to work for 1 hour, intermittently for 30 minutes), and take the supernatant Centrifuge to obtain a uniform dispersion, which is molybdenum sulfide nanosheets; wherein, the concentration of the dispersion is 0.5mg / ml;

[0044] (2) Take the above dispersion, centrifuge at 9000 rpm for 15 minutes, pour off the upper suspension, add dimethylformamide and re-sonicate for 25 minutes to disperse evenly;

[0045] (3) Take the above-mentioned dispersion liquid and centrifuge it at a speed of 2000 rpm for 30 minutes, and take the upper suspension liquid to be the molybdenum sulfide nanosheet dispersion liquid.

[0046] (4) Take the above-mentioned dispersion liquid by suction filtration, wash with 30mL deionized water and 30mL ethanol alternately for 3 times and then wash with 150mL deionized wa...

Embodiment 3

[0049] (1) Get the binder polyvinylidene fluoride (PVDF) solution (solvent is N-methylpyrrolidone) of molybdenum sulfide nanoplate dispersion liquid 5mL, 2.35mg conductive carbon black and 100mg 2wt% in embodiment 2, they are in Grind by hand in a mortar for 5 minutes and set aside.

[0050] (2) Use a glass rod to evenly coat the prepared slurry above on the fully dried current collector (copper foil). After the coating is uniform, move the current collector into an electric blast drying oven at 70°C to dry for 6 hours. After fully drying The electrode sheets are stamped into small discs with a certain diameter by a manual button cell slicer.

[0051] (3) In the glove box, use the above-mentioned electrode sheet as the negative electrode and the lithium sheet as the positive electrode, select the Celgard-2400 diaphragm, and assemble the 2032 button cell with LB303 electrolyte. Finally, the assembled battery is sealed with a button-type automatic sealing machine, and the elect...

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Abstract

The invention relates to high-concentration molybdenum disulfide nanometer sheet dispersion liquid, and a preparation method and application thereof. The concentration of the dispersion liquid is 1 to 20mg / mL. The preparation method comprises the following steps of adding molybdenites into an organic solvent; performing ultrasonic treatment for 5 to 30h to obtain the molybdenum disulfide nanometer sheet dispersion liquid; performing centrifugal screening and suction filtration to obtain molybdenum disulfide nanometer sheets; transferring the molybdenum disulfide nanometer sheets into a low-boiling point solvent by a solvent transferring method; performing ultrasonic dispersion; and obtaining the high-concentration molybdenum disulfide nanometer sheet dispersion liquid. The method provided by the invention is simple, and achieves an environment-friendly effect; and the preparation method for preparing the high-concentration molybdenum disulfide nanometer sheet dispersion liquid solves the problems of easy glomeration and poor stability of the molybdenum disulfide nanometer sheets produced and prepared in the prior art.

Description

technical field [0001] The invention belongs to the field of transition metal chalcogenide materials and their preparation, and in particular relates to a high-concentration molybdenum disulfide nanosheet dispersion and its preparation method and application. Background technique [0002] Due to the strong intralayer covalent bonding force and relatively weak interlayer van der Waals force in layered materials, the two-dimensional (2D) structure provides excellent electron transport paths in the plane and avoids interlayer interactions. Poor three-dimensional (3D) transfer process. Therefore, graphene-like 2D materials show fantastic electronic, optical, and mechanical properties due to their unique structures. Molybdenum disulfide (MoS 2 ) because of its electrical conductivity and active edge positions make it a promising catalyst for the hydrogen evolution reaction (HER), which is a layered hexagonal structure with weak van der Waals bonds similar to graphite, which bin...

Claims

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Application Information

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IPC IPC(8): C01G39/06C25B1/02C25B11/06H01M4/58
CPCC01G39/06C01P2004/03C01P2004/04C01P2006/40C25B1/02C25B11/04H01M4/5815Y02E60/10
Inventor 刘天西王开张超张凌隽李乐杨静赵哲
Owner DONGHUA UNIV
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