Graphene hollow nano fiber and preparation method thereof

A hollow nano, graphene technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of long radial diffusion distance of ions, unfavorable application performance, etc., and achieve volumetric energy density The effect of improvement, reduction of preparation cost, and easy cleaning

Active Publication Date: 2014-11-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the size limitation of the template, the diameter of the graphene solid fiber is still relatively large, and the distance for ion diffusion in its radial direction is still long, which is not conducive to further improving the application performance.

Method used

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  • Graphene hollow nano fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Zinc carbonate fiber template with a diameter of 6nm and an aspect ratio of 1000:1. Put it in the reactor, raise the temperature to 600°C under the atmosphere of argon as the carrier, and then pass the process gas (a mixture of hydrogen, argon and CO, the volume ratio is 0.5:0.5:1) at the same temperature break down. After reacting for 1 hour, the graphene hollow nanofiber product was directly obtained. Turn off the carbon source, keep the flow and ratio of hydrogen and argon carrier gas constant, and cool down to room temperature. The inner diameter of the obtained product is 6nm, the outer diameter is 7nm, the aspect ratio is 1000:1, and the specific surface area is 2600m 2 / g.

Embodiment 2

[0034] Using zinc sulfate fiber template, its diameter is 698nm, aspect ratio is 20:1. It is placed in a reactor, and after the temperature is raised to 1000 ° C under the atmosphere of nitrogen as the carrier, the process gas (hydrogen, nitrogen and methane, CO 2 The mixed gas, the volume ratio is 0.5:0.5:3:3) decomposes at the same temperature. After 2 hours of reaction, the graphene hollow nanofiber product is directly obtained, the carbon source is turned off, the flow rate and ratio of the hydrogen-nitrogen carrier gas are kept constant, and the temperature is lowered to room temperature. The inner diameter of the obtained product is 698nm, the outer diameter is 700nm, the aspect ratio is 20:1, and the specific surface area is 2300m 2 / g.

Embodiment 3

[0036] Zinc hydroxide fiber template with a diameter of 6nm and an aspect ratio of 2000:1. Put it in the reactor, raise the temperature to 400°C under the atmosphere of hydrogen as the carrier, and then pass in the mixed gas of process gas (hydrogen, acetylene, methanol, the volume ratio is 1:10) to decompose at the same temperature. After reacting for 0.01 hour, the graphene hollow nanofiber product is directly obtained, the carbon source is turned off, the flow rate of the hydrogen carrier gas is kept constant, and the temperature is lowered to room temperature. The inner diameter of the obtained product is 6nm, the outer diameter is 7nm, the aspect ratio is 2000:1, and the specific surface area is 300m 2 / g.

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Abstract

The invention relates to a graphene hollow nano fiber and a preparation method thereof. The external diameter of the graphene hollow nano fiber is 7-700nm, the internal diameter is 6-698nm, the length-diameter ratio is 20:1-2000:1, and the specific area is 300-2600 m<2> / g. The preparation method comprises the following steps: by using an inorganic fiber as a template, heating to 400-1000 DEG C in a carrier gas, introducing a carbon source, and decomposing at the same temperature to directly form the graphene hollow fiber or form a carbon-inorganic template composition fiber; and cooling the composition fiber, treating with acid or alkali, filtering, washing and drying. The preparation method is simple; and the product has the advantages of high purity, complete structure and high mechanical strength, and is suitable to be used as a separation or adsorbing material, an electrode material for electrochemical energy storage or a conducting agent.

Description

technical field [0001] The invention belongs to the technical field of carbon materials and their preparation, in particular to a graphene hollow nanofiber and a preparation method thereof. Background technique [0002] Carbon nanotubes are a kind of nanomaterials with a hollow structure. They have a rich specific surface area. At the same time, their inner cavity can be filled with various substances. They are used as multifunctional materials such as electricity, force, magnetism, and dielectrics, and are suitable for transparent conductive displays. Materials, electrode materials for electrochemical energy storage or catalyst supports, and adsorption materials. However, media such as gases or various ions cannot diffuse through the radial direction of carbon nanotubes coaxial with the carbon layer, which limits its application range. In addition, carbon nanotubes are often prepared with metal catalysts, and their metal residues often affect their cycle life in aspects su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00B82Y40/00
Inventor 骞伟中田佳瑞崔超婕
Owner TSINGHUA UNIV
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