Porous hollow carbon nanofiber as well as preparation method and application thereof

A carbon nanofiber and nanocomposite fiber technology, applied in the field of carbon fiber materials, can solve the problems of unstable fiber structure and excessively wide distribution of porous pore sizes, and achieve the effects of narrow pore size distribution, simple pore-forming methods, and increased specific surface area

Inactive Publication Date: 2013-08-07
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The primary purpose of the present invention is to overcome the problems of too wide porous pore size distribution and unstable fiber structure, and provide a method for preparing porous hollow carbon nanofibers with narrow pore size distribution

Method used

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  • Porous hollow carbon nanofiber as well as preparation method and application thereof
  • Porous hollow carbon nanofiber as well as preparation method and application thereof
  • Porous hollow carbon nanofiber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) At 20°C, stir 1.0g of cobalt acetate until it is completely dissolved in 20ml of DMF, then add 2.5g of PAN to it, and stir evenly to obtain a wine-red transparent liquid as the outer layer fluid; take pure dimethyl silicone oil as Inner fluid.

[0035] (2) At 20°C, input the prepared PAN / cobalt acetate solution and pure simethicone oil into the outer layer and inner layer of the coaxial electrospinning nozzle at flow rates of 0.6ml / h and 0.25ml / h, respectively, for Coaxial electrospinning, the spinning voltage is 14KV, the spun fiber is received by aluminum foil paper, and the receiving distance is 15cm, and the simethicone (core)-PAN / cobalt acetate (shell) nanocomposite fiber is obtained.

[0036] (3) The obtained core-shell nanocomposite fibers were placed in petroleum ether for ultrasonic washing (ultrasonic frequency: 100 W) to obtain PAN / cobalt acetate hollow nanocomposite fibers.

[0037](4) Pre-oxidize the obtained hollow nanocomposite fiber in air, the pre-...

Embodiment 2

[0041] In addition to replacing the cobalt acetate used in step (1) with nickel acetate, the spinning voltage in step (2) was set to 13KV, the pre-oxidation time in step (4) was set to 1h, and the Except that the carbonization temperature was set to 900° C., the same procedure as in Example 1 was carried out to obtain porous hollow carbon nanofibers. The TEM and SEM pictures of the fiber are as follows image 3 , 4 As shown, the average diameter of the carbon fiber is 400nm, the porous diameter is 20nm, and the hollow diameter is 100nm.

Embodiment 3

[0043] In addition to replacing 1.0g of cobalt acetate used in step (1) with 1.5g of zinc acetate, setting the pre-oxidation time in step (4) to 1h, and setting the carbonization temperature in step (5) to 900°C, other In the same manner as in Example 1, porous hollow carbon nanofibers were obtained. The TEM and SEM pictures of the fiber are as follows Figure 5 , 6 As shown, the average diameter of the carbon fiber is 400nm, the porous diameter is 30nm, and the hollow diameter is 200nm.

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Abstract

The invention discloses a method for preparing porous hollow carbon nanofiber by using metal salt pore-forming. The method comprises the following steps of: mixing metal salt with polyacrylonitrile to prepare outer-layer fluid; preparing inner-layer fluid by using soluble or volatile oil; respectively inputting the outer-layer fluid and the inner-layer fluid into the outer layer and the inner layer of a coaxial electrospinning spray head at a constant flow velocity and velocity ratio to carry out coaxial electrostatic spinning to obtain core-shell nano composite fiber; and carrying out ultrasonic washing, pre-oxidation, carbonization and ultrasonic pickling on the obtained core-shell nano composite fiber to obtain the porous hollow carbon nanofiber. The porous hollow carbon nanofiber prepared by using the preparation method has extremely wide application values in terms of gas adsorption, catalysis and battery electrode materials.

Description

technical field [0001] The invention belongs to the field of carbon fiber materials, and in particular relates to a porous hollow carbon nanofiber and a preparation method and application thereof. Background technique [0002] Carbon fiber is a microcrystalline graphite material obtained by carbonization and graphitization of organic fibers. It has excellent properties such as high temperature resistance, friction resistance, corrosion resistance, high strength, high modulus, thermal conductivity, and electrical conductivity. It is widely used in construction, chemical industry, Industry, aerospace and other fields. In recent years, with the development of industry, the demand for carbon fiber with large specific surface area is increasing, and the development of nanotechnology makes it possible. The ultra-fine and porous carbon fiber can greatly increase its specific surface area while maintaining the excellent characteristics of carbon fiber, so that it has new applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F1/08
Inventor 吴艳波宋铁犇于洪全毕军
Owner DALIAN JIAOTONG UNIVERSITY
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