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A hollow sandwich structure molybdenum disulfide-based nanocomposite material and its preparation method

A technology of nanocomposite materials and laminated structures, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as insufficient active sites, easy aggregation of sheets, and limited improvement. Achieve the effects of improving electrochemical performance, increasing specific surface area, and improving conductivity

Active Publication Date: 2021-08-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But MoS 2 The sheets are easy to agglomerate, resulting in insufficient exposed active sites, and electrons in MoS 2 The transition efficiency between nanosheet layers is low; secondly, bulk MoS 2 The poor conductivity of the material and the low electron transfer efficiency seriously restrict the application in the field of electrochemistry.
[0003] CN201710397526.1 discloses the preparation method of carbon composite material, this method will MoS 2 It is made into a hollow structure and the outer layer is covered with a carbon layer. Although it can improve conductivity and reduce agglomeration to a certain extent, the degree of improvement is limited, and it still cannot overcome the constraints and limitations of its application in the field of electrochemistry.

Method used

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  • A hollow sandwich structure molybdenum disulfide-based nanocomposite material and its preparation method
  • A hollow sandwich structure molybdenum disulfide-based nanocomposite material and its preparation method
  • A hollow sandwich structure molybdenum disulfide-based nanocomposite material and its preparation method

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preparation example Construction

[0038] The invention provides a hollow sandwich structure MoS 2 A method for preparing a base nanocomposite, the method comprising the following steps:

[0039] Step 1, prepare SiO 2 Microsphere powder, as a growth template for subsequent material preparation;

[0040] Step 2, the appropriate amount of SiO 2The microsphere powder and a certain mass of PDA are dissolved in an appropriate amount of Tris buffer solution, mixed and ultrasonically dispersed to obtain a mixed solution A;

[0041] Step 3, transfer the mixed solution A to a magnetic stirrer, add a certain amount of ammonium persulfate solution, and continue stirring for a certain period of time;

[0042] Step 4, collect the product of step 3, and carry out annealing treatment, obtain black powder sample A, set aside;

[0043] Step 5, take an appropriate amount of sample A and mix molybdate and thiourea powder in a certain amount of glucose solution, and ultrasonically stir until it is in a uniform state to obtain ...

Embodiment 1

[0067] Take 1g of SiO 2 The nano-microsphere material was dissolved in 50 mL of Tris buffer solution with a concentration of 50 mmol / L and 200 mg of dopamine hydrochloride, and ultrasonicated for 25 min until the solution was uniformly dispersed. The obtained homogeneously mixed solution was transferred to a magnetic stirrer, and 10 mL of ammonium persulfate solution with a concentration of 65 mg / mL was added dropwise while stirring, and the stirring was continued for 12 h. Then it was collected by centrifugation at 8000r / min, washed four times with ultrapure aqueous solution and twice with ethanol solution, and the centrifugation time was 5 minutes each time. Finally, put the precipitate collected by washing into a vacuum oven and keep it at 60°C for vacuum drying for 10 hours. Under an argon atmosphere, it was annealed at 550°C for 3 hours. After cooling, a black powdery sample A was obtained for future use. Get 55mg sample A and 80mg (NH 4 ) 2 Mo 2 o 7 , 160mg thiourea...

Embodiment 2

[0069] Take 1.5g of SiO 2For the nanosphere material, dissolve it and 250mg of dopamine hydrochloride in 45mL, 40mmol / L Tris buffer solution, and sonicate for 25min until the solution is uniformly dispersed. The obtained homogeneous mixed solution was transferred to a magnetic stirrer, and 18 mL of ammonium persulfate solution with a concentration of 70 mg / mL was added dropwise while stirring, and the stirring was continued for 12 h. Then it was collected by centrifugation at 8000r / min, washed four times with ultrapure aqueous solution and twice with ethanol solution, and the centrifugation time was 5 minutes each time. Finally, put the precipitate collected by washing into a vacuum oven and keep it at 60°C for vacuum drying for 10 hours. Under an argon atmosphere, it was annealed at 550°C for 3 hours. After cooling, a black powdery sample A was obtained for future use. Get 60mg sample A and 100mg (NH 4 ) 2 Mo 2 o 7 , 20mgNi(CHCOO) 2 4H 2 0, 200mg thiourea, it is dissol...

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Abstract

The present invention belongs to two-dimensional MoS 2 The technical field of preparation of base nanocomposite materials relates to a hollow sandwich laminated molybdenum disulfide based nanocomposite material and its preparation method. It is a hollow structure and includes carbon layers, MoS 2 layers and carbon layers. Using SiO 2 The microspheres are used as templates, which are sequentially coated with carbon layers, MoS 2 layer and carbon layer, then etched SiO 2 Hollow sandwich structure MoS was prepared 2 based nanocomposites. The unique hollow sandwich laminated structure of the obtained product is conducive to exposing more active sites, improving electrical conductivity, reducing agglomeration, and improving the electrocatalytic performance of the material. Therefore, the preparation of this composite material offers the possibility of its potential application in many fields.

Description

technical field [0001] The present invention belongs to two-dimensional MoS 2 The technical field of nano-composite material preparation relates to a hollow sandwich structure MoS 2 Nanocomposite materials and methods for their preparation. Background technique [0002] MoS 2 It is a two-dimensional layered nanomaterial with a graphene-like structure, which is a typical representative of the transition metal chalcogenide family. The atoms in the layers are bonded by covalent bonds, and the layers interact by van der Waals forces. It has many advantages in the fields of energy, sensing, etc. For example, it is easier to modify the electrode surface, has hydrogen adsorption free energy similar to metal platinum, can exist stably in strong acidic solutions, and is rich in resources. But MoS 2 The sheets are easy to agglomerate, resulting in insufficient exposed active sites, and electrons in MoS 2 The transition efficiency between nanosheet layers is low; secondly, bulk M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J27/051
CPCB01J27/0515B01J27/24B01J35/0033
Inventor 马飞罗巧梅王琛
Owner XI AN JIAOTONG UNIV
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