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MoS2/GNRs composite material with loose three-dimensional winding structure, preparation method and application thereof

A technology of graphene nanobelts and composite materials, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as limited specific surface area, poor rate performance, and large capacity loss. Achieve the effect of good dispersion, high conductivity and small size

Active Publication Date: 2017-11-24
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, MoS 2 The low conductivity and limited specific surface area make it have the defects of large capacity loss and poor rate performance when it is used as an anode material for lithium-ion batteries.

Method used

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  • MoS2/GNRs composite material with loose three-dimensional winding structure, preparation method and application thereof
  • MoS2/GNRs composite material with loose three-dimensional winding structure, preparation method and application thereof
  • MoS2/GNRs composite material with loose three-dimensional winding structure, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0024] Take 3.531 g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2.521 g H 2 C 2 o 4 2H 2 O powder is placed in the agate grinder and mixed thoroughly and ground. Add 10.8 mL of deionized water to a 20 mL polytetrafluoroethylene autoclave, then add 3.045 g of CS(NH 2 ) 2 , stir well until the powder dissolves. Joined by (NH 4 ) 6 Mo 7 o 24 4H 2 O and H 2 C 2 o 4 2H 2 O Mix the ground mixture and stir well. then press Add graphene nanoribbons at a mass ratio of 100:10 (the mass fraction of graphene nanoribbons is 9.09wt%). After the mixture was hydrothermally reacted for 5 hours, it was centrifuged, deionized water and absolute ethanol were ultrasonically oscillated, and the product was washed 3 times, dried in vacuum at 70 °C, and annealed at 500 °C for 2 hours in a nitrogen atmosphere to obtain MoS 2 / GNRs (9.09 wt%) composite. The heating and cooling rates of composite materials annealed in nitrogen atmosphere are both 2 ℃·min -1 .

[0025] The crystalline phase of ...

Embodiment example 2

[0027] Take 3.531 g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2.521 g H 2 C 2 o 4 2H 2 O powder is placed in the agate grinder and mixed thoroughly and ground. Add 10.8 mL of deionized water to a 20 mL polytetrafluoroethylene autoclave, then add 3.045 g of CS(NH 2 ) 2 , stir well until the powder dissolves. Joined by (NH 4 ) 6 Mo 7 o 24 4H 2 O and H 2 C 2 o 4 2H 2 O the ground mixture, stir well. then press GNRs were added at a mass ratio of 100:30 (the mass fraction of graphene nanoribbons was 23.08 wt%). After the mixture was hydrothermally reacted for 5 hours, it was centrifuged, deionized water and absolute ethanol were ultrasonically oscillated, and the product was washed 3 times, dried in vacuum at 70 °C, and annealed at 500 °C for 2 hours in a nitrogen atmosphere to obtain MoS 2 / GNRs((23.08wt%) composite material. During the annealing process of the composite material, the heating and cooling rates were 2 ℃·min -1 .

[0028] Adopt X-ray powder diffraction te...

Embodiment example 3

[0030] Take 3.531 g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2.521 g H 2 C 2 o 4 2H 2 O powder, mix well and grind. Add 10.8 mL of deionized water to a 20 mL polytetrafluoroethylene autoclave, and then add 3.045 g of CS(NH 2 ) 2 , stir well until the powder dissolves. Joined by (NH 4 ) 6 Mo 7 o 24 4H 2 O and H 2 C 2 o 4 2H 2 O the ground mixture, stir well. then press GNRs were added at a mass ratio of 100:40 (the mass fraction of graphene nanoribbons was 28.57 wt%). After the mixture was hydrothermally reacted for 5 hours, it was centrifuged, washed, dried in vacuum at 70 °C, and annealed at 500 °C for 2 hours in a nitrogen atmosphere to obtain MoS 2 / GNRs((28.57 wt%) composite material. The heating and cooling rate of the composite material annealed in nitrogen atmosphere is 2 ℃·min -1 .

[0031] Adopt X-ray powder diffraction test to analyze the crystalline phase of prepared product, the result is as follows image 3 Shown in a. Compared with the standard spec...

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Abstract

The invention discloses a MoS2 / GNRs composite material with a loose three-dimensional winding structure. The composite material is of a loose three-dimensional network structure formed by mutual winding and interweaving of quasi-one-dimensional GNRs; two-dimensional layered MoS2 with fewer layers and large interlayer spacing grows in the structure dispersedly, a large amount of gap channels are arranged and are beneficial to diffusion of electrolyte in a solution, and the own good electrical conductivity of nanoribbons is beneficial to fast transmission of electrons in the composite material. A preparation method of the composite material comprises the following steps: adopting (NH4)6Mo7O24.4 H2O, CS(NH2)2, H2C2O4.2H2O and graphene nanoribbons as materials with the amount ratio of Mo / S / H2C2O4 being 1:2:1, adopting a hydrothermal method to carry out annealing treatment under the atmosphere of nitrogen gas to prepare and obtain the MoS2 / GNRs composite material with the loose three-dimensional winding structure.

Description

technical field [0001] The invention belongs to the field of graphene materials and molybdenum disulfide composite materials, and specifically relates to a MoS with a loose three-dimensional winding structure 2 / GNRs composite materials, and related preparation methods and applications. What is adopted is a preparation method with simple process and little pollution. The composite material can be used as an electrode material of a lithium ion battery and an electrocatalyst for hydrogen evolution reaction of electrolyzed water. Background technique [0002] In recent years, MoS 2 As a new type of material, it has been widely studied, especially when it is used as a negative electrode material for lithium-ion batteries, a catalyst, a lubricant, and an electrochemical double-layer capacitor material, it has shown excellent performance. MoS 2 It has a two-dimensional layered structure, the S-Mo-S atoms in the layer are closely combined through covalent bonds, and the layers ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B01J27/051
CPCB01J27/051B82Y30/00H01M4/366H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 庄乃锋胡晓琳范梓涵吴璇陈新陈建中
Owner FUZHOU UNIV
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