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Zinc cobalt oxide/graphene/carbon nanofiber composite material and preparation method thereof

A carbon nanofiber and graphene composite technology, which is applied in the field of cobalt zinc oxide/graphene/carbon nanofiber composite materials and its preparation, can solve the problem of affecting catalytic properties and energy storage cycle stability, and the active sites cannot be fully exposed and other problems, to achieve the effect of ingenious experimental design, easy operation, and simple preparation process

Inactive Publication Date: 2016-03-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure cobalt-zinc oxide particles are prone to agglomeration, which prevents the active sites from being fully exposed, seriously affecting its catalytic properties and cycle stability of energy storage.

Method used

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  • Zinc cobalt oxide/graphene/carbon nanofiber composite material and preparation method thereof
  • Zinc cobalt oxide/graphene/carbon nanofiber composite material and preparation method thereof
  • Zinc cobalt oxide/graphene/carbon nanofiber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1, This embodiment includes the following steps:

[0034] (1) Add 1g of polyacrylonitrile powder to 5mL N,N- Stir continuously in the dimethylformamide solvent to prepare a uniform viscous dispersion;

[0035] (2) Electrospin the obtained polyacrylonitrile dispersion, 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;

[0036] (3) Pre-oxidize the obtained polyacrylonitrile spun membrane in an air atmosphere, the pre-oxidation temperature is 250℃, and the heating rate is 1℃min -1 , The pre-oxidation time is 1.5h, and the pre-oxidized polyacrylonitrile nanofiber membrane is prepared;

[0037] (4) Put the obtained pre-oxidized polyacrylonitrile nanofiber membrane in 1mgmL -1 Soak in graphene oxide solution for 24 hours to prepare polyacrylonitrile nanofiber / graphene oxide composite film;

[0038] (5) The obtained polyacrylonitrile ...

Embodiment 2

[0041] Example 2, The mass of cobalt nitrate in Example 1 was changed to 290 mg, the mass of zinc nitrate was changed to 145 mg, and the rest were the same as in Example 1. The final composite material obtained was denoted as ZCS / GNS / CNF-2. Implementation results: Cobalt zinc oxide nanoparticles grow uniformly on graphene / carbon nanofibers; compared with ZCS / GNS / CNF-1, the cobalt zinc oxide nanoparticles in ZCS / GNS / CNF-2 have smaller sheets , The content is also less.

Embodiment 3

[0042] Example 3. The mass of cobalt nitrate in Example 1 is changed to 1160mg, the mass of zinc nitrate is changed to 580mg, and the rest are the same as in Example 1. The final composite material obtained is denoted as ZCS / GNS / CNF-2, and the final composite The material is denoted as ZCS / GNS / CNF-3. Implementation results: Cobalt and zinc oxide nanoparticles are uniformly grown on graphene / carbon nanofibers; compared with ZCS / GNS / CNF-1, the layers of cobalt and zinc oxide nanoparticles in ZCS / GNS / CNF-3 are larger , The content is also more.

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Abstract

The invention belongs to the technical field of transition metal oxide-carbon materials, and specifically provides a zinc cobalt oxide / graphene / carbon nanofiber composite material and a preparation method thereof. The preparation method provided by the invention comprises the following steps: preparing a polyacrylonitrile nanofiber membrane through electrospinning, coating graphene oxide on polyacrylonitrile nanofiber through a solution immersion process, preparing a graphene / carbon nanofiber composite membrane through high-temperature carbonization, and finally subjecting the graphene / carbon nanofiber to one-step hydrothermal process so as to realize in-situ growth of zinc cobalt oxide nanoparticles. The zinc cobalt oxide / graphene / carbon nanofiber composite material prepared by using the method provided by the invention has controllable morphology, high specific surface area and excellent conductivity, can be used as an ideal high-performance electrocatalytic material and an electrode material for new-energy devices like lithium ion batteries and solar cells.

Description

technical field [0001] The invention belongs to the technical field of transition metal selenide-carbon materials, and in particular relates to a cobalt-zinc oxide / graphene / carbon nanofiber composite material and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional material composed of carbon atoms with a thickness of only one atom. It has excellent physical and chemical properties, such as excellent mechanical properties, high electrical conductivity, and good thermal conductivity. It is considered to be the most One of the potential nanomaterials. As a one-dimensional carbon nanomaterial, carbon nanofiber has the advantages of good mechanical properties, large specific surface area and good chemical stability. These special properties make it widely used in catalyst supports, polymer nanocomposites, energy Flexible substrate materials for conversion and storage devices, etc. Electrospinning is a simple and effective technology for pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/524C04B35/622C04B41/85
CPCC04B35/524C04B35/62218C04B41/5027C04B41/85C04B2235/425C04B2235/48C04B2235/5212C04B2235/5256C04B41/4535C04B41/455
Inventor 刘天西张龙生樊玮缪月娥张由芳左立增
Owner FUDAN UNIV
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