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Active carbon nanofiber and preparation method thereof

A nanofiber and activated carbon technology, applied in the field of material science, can solve the problems of large amount of activator, inability to achieve uniform activation, and high cost, and achieve the effect of improving activation efficiency

Active Publication Date: 2016-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has the potential problem that the activator is only distributed on the surface of the fiber and the activation is not uniform, and the diameter of the obtained carbon fiber is in the micron order.
[0005] To sum up, the current chemical activation method to prepare carbon nanofibers with polyacrylonitrile as the precursor has the disadvantages of high cost, excessive amount of activator or inability to achieve uniform activation.

Method used

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  • Active carbon nanofiber and preparation method thereof
  • Active carbon nanofiber and preparation method thereof
  • Active carbon nanofiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 1 g of polyacrylonitrile to 10 g of N,N-dimethylformamide, stir at 60° C. for 2 hours, then cool naturally to obtain a yellow transparent and clear solution.

[0029] (2) Add 0.1 g of phosphorous acid into the above solution, and stir for 2 hours until the phosphorous acid is completely dissolved to obtain an electrospinning precursor liquid.

[0030] (3) The electrospinning method is adopted to prepare polyacrylonitrile nanofibers containing phosphorous acid, and the specific parameters are as follows: the syringe needle used is No. 25, the applied voltage is 20kV, a flat plate collector is adopted, the needle point is 15 cm away from the collector, and the injection speed 1mL / min, spinning time 12 hours.

[0031] (4) The polyacrylonitrile / phosphorous acid nanofibers prepared by the electrospinning method were pre-oxidized at 300° C. for 30 min in an air atmosphere.

[0032] (5) Put the pre-oxidized nanofibers into the atmosphere protection furnace, at 800 ° C...

Embodiment 2

[0036] (1) Add 1 g of polyacrylonitrile to 10 g of N,N-dimethylformamide, stir at 60° C. for 2 hours, then cool naturally to obtain a yellow transparent and clear solution.

[0037] (2) Add 0.05 g of phosphorous acid into the above solution, and stir for 2 hours until the phosphorous acid is completely dissolved to obtain an electrospinning precursor liquid.

[0038] (3) The electrospinning method is adopted to prepare polyacrylonitrile nanofibers containing phosphorous acid, and the specific parameters are as follows: the syringe needle used is No. 25, the applied voltage is 20kV, a flat plate collector is adopted, the needle point is 15 cm away from the collector, and the injection speed 1mL / min, spinning time 12 hours.

[0039] (4) The polyacrylonitrile / phosphorous acid nanofibers prepared by the electrospinning method were pre-oxidized at 300° C. for 30 min in an air atmosphere.

[0040] (5) Put the pre-oxidized nanofibers into the atmosphere protection furnace, at 800 ° ...

Embodiment 3

[0043] (1) Add 1 g of polyacrylonitrile to 10 g of N,N-dimethylformamide, stir at 60° C. for 2 hours and then cool naturally to obtain a yellow transparent and clear solution.

[0044] (2) Add 0.02 g of phosphorous acid into the above solution, and stir for 2 hours until the phosphorous acid is completely dissolved to obtain an electrospinning precursor liquid.

[0045] (3) Adopt electrospinning method to prepare the polyacrylonitrile nanofiber that contains phosphorous acid, concrete parameter is as follows: the syringe needle size that it is packed into adopting is No. 25, and applied voltage is 20kV, and needle point is apart from collector distance 15cm, and injection speed 1mL / min, spinning time 12 hours.

[0046] (4) The polyacrylonitrile / phosphorous acid nanofibers prepared by the electrospinning method were pre-oxidized at 300° C. for 30 min in an air atmosphere.

[0047] (5) Put the pre-oxidized nanofibers into the atmosphere protection furnace, at 1000°C, high-purit...

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Abstract

The invention discloses an active carbon nanofiber and a preparation method thereof. The preparation method comprises the following steps of: by taking polyacrylonitrile as a carbon source, N,N-dimethylformamide as a solvent and phosphorous acid as an in-situ activator, mixing a certain amount of polyacrylonitrile and phosphorous acid (H3PO3), dissolving the mixture in N,N-dimethylformamide to form precursor liquid; preparing a precursor fiber by virtue of an electrostatic spinning method; and carbonizing in the presence of a high-temperature inert gas so as to obtain the active carbon nano fibers with high specific surface area and high porosity. The specific surface area of the active carbon nanofiber is within 580-710m<2> / g, the pore volume of the active carbon nanofiber is within 0.20-0.55cm<3> / g, and the active carbon nanofiber can serve as an excellent-performance catalyst, a catalyst carrier, a supercapacitor electrode and the like.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to an activated carbon nanofiber with a nanopore structure and a preparation method thereof. Background technique [0002] Activated carbon material is a kind of porous material, which has the advantages of low price, large porosity, stable structure and adjustable microstructure. It is widely used in adsorption, catalyst carrier and electrode of electrochemical energy storage devices. According to the dimension division of the microstructure unit of activated carbon materials, it can be divided into zero-dimensional (activated carbon nanoparticles), one-dimensional (activated carbon nanowires, wire nanotubes, nanofibers, etc.), two-dimensional (activated graphene sheet etc. Among all kinds of activated carbon materials, activated carbon nanofibers have the characteristics of both activated carbon and one-dimensional nanomaterials, which can effectively increas...

Claims

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Application Information

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IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 高秋月田佳伟支明佳
Owner ZHEJIANG UNIV
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