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Vulcanized cobalt-nickel/graphene/carbon nano fiber composite material and preparation method thereof

A carbon nanofiber, cobalt-nickel sulfide technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problems affecting catalytic properties and energy storage cycle stability, active sites cannot be fully exposed, etc. The experimental design is clever, easy to operate, and the effect of high specific surface area

Inactive Publication Date: 2016-02-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure nickel cobalt sulfide particles are easy to agglomerate, so that the active sites cannot be fully exposed, which seriously affects its catalytic properties and cycle stability of energy storage.

Method used

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  • Vulcanized cobalt-nickel/graphene/carbon nano fiber composite material and preparation method thereof
  • Vulcanized cobalt-nickel/graphene/carbon nano fiber composite material and preparation method thereof
  • Vulcanized cobalt-nickel/graphene/carbon nano fiber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1, This embodiment includes the following steps:

[0036] (1) Add 1g polyacrylonitrile powder to 5mL N,N- In dimethylformamide solvent, stirring continuously, a uniform viscous dispersion was prepared.

[0037] (2) The obtained polyacrylonitrile dispersion is subjected to electrospinning, and the adjustment process parameters are: electrostatic field voltage 20kV, spinning speed 0.3mmmin -1 , the receiving distance is 20cm, and the polyacrylonitrile nanofiber membrane is prepared.

[0038] (3) Pre-oxidize the obtained polyacrylonitrile spun membrane in an air atmosphere, the pre-oxidation temperature is 250°C, and the heating rate is 1°C min -1 , the preoxidation time is 1.5h, and the preoxidized polyacrylonitrile nanofiber membrane is prepared.

[0039] (4) Chopped 100mg of pre-oxidized polyacrylonitrile nanofiber membrane and put into 20mL of 1mgmL -1 The graphene oxide solution is mechanically stirred to prepare a uniform graphene oxide / polyacrylonitril...

Embodiment 2

[0045] Example 2, The quality of the cobalt nitrate in embodiment 1 becomes 116mg, the quality of nickel nitrate becomes 58mg, the quality of thiourea becomes 100mg, all the other are the same as embodiment 1, the composite material finally obtained is recorded as NiCo 2 S 4 / GNS / CNF-2. Implementation results: cobalt-nickel sulfide nanosheets grow uniformly on graphene / carbon nanofiber airgel; 2 S 4 / GNS / CNF-1 compared to NiCo 2 S 4 The cobalt-nickel sulfide nanosheets in / GNS / CNF-2 have smaller sheets and less content.

Embodiment 3

[0046] Example 3, The quality of the cobalt nitrate in embodiment 1 becomes 464mg, the quality of nickel nitrate becomes 232mg, the quality of thiourea becomes 400mg, all the other are the same as embodiment 1, the composite material finally obtained is recorded as NiCo 2 S 4 / GNS / CNF-3. Implementation results: cobalt-nickel sulfide nanosheets grow uniformly on graphene / carbon nanofiber airgel; 2 S 4 / GNS / CNF-1 compared to NiCo 2 S 4 The cobalt-nickel sulfide nanosheets in / GNS / CNF-3 have larger sheets and more content.

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Abstract

The invention belongs to the technical field of transition metal sulfide-carbon materials, and particularly relates to a vulcanized cobalt-nickel / graphene / carbon nano fiber composite material and a preparation method thereof. The preparation method includes the steps that polyacrylonitrile nano fibers are prepared through electrostatic spinning, oxidized graphene / polyacrylonitrile nano fiber aerogel is prepared through mechanical stirring and freezing drying, then graphene / carbon nano fiber aerogel is prepared through high-temperature carbonization, and finally, vulcanized cobalt-nickel nanosheets grow in situ on the graphene / carbon nano fiber aerogel through the one-step hydrothermal method. The vulcanized cobalt-nickel / graphene / carbon nano fiber composite material prepared through the method has the advantages that the material has a three-dimensional porous space structure, conductivity is good and chemical properties are stable, and can serve as an ideal high-performance electro-catalysis material and electrode materials of new energy devices such as lithium ion batteries and solar batteries.

Description

technical field [0001] The invention belongs to the technical field of transition metal sulfide-carbon materials, and in particular relates to a cobalt-nickel sulfide / graphene / carbon nanofiber composite material and a preparation method thereof. technical background [0002] Graphene has excellent physical and chemical properties, such as high electrical conductivity, excellent mechanical properties, high specific surface area, light weight and low density, and good chemical stability. These special properties make it widely used in catalyst supports, polymer nanocomposites, flexible substrate materials for energy conversion and storage devices, etc. It is considered to be one of the top ten new materials with the greatest potential in the future. However, graphene sheets are easy to stack, so that the excellent properties of graphene cannot be fully utilized. This patent adopts electrospinning process, mechanical stirring and freeze-drying method to combine graphene oxide ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/36H01G11/30
CPCY02E60/10
Inventor 刘天西张龙生樊玮缪月娥张由芳左立增顾华昊
Owner FUDAN UNIV
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