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Preparation method of porous carbon fiber with high specific surface area

A technology of porous carbon fiber and high specific surface area, which is applied in the fields of fiber chemical characteristics, rayon manufacturing, textiles and paper making, etc. It can solve the problems of infiltration and impossibility to improve material properties, etc., and achieve the effect of high specific surface area

Inactive Publication Date: 2017-03-22
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the micropores generally produced by calcination cannot improve the performance of the material because they cannot be infiltrated. Therefore, it is of great significance to develop a porous carbon fiber with better performance that is suitable for catalyst supports, supercapacitors, and lithium-ion batteries.

Method used

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  • Preparation method of porous carbon fiber with high specific surface area
  • Preparation method of porous carbon fiber with high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Add 1 part by weight of polyacrylonitrile and 0.04 part by weight of pore-forming agent to 6 parts by weight of N,N-dimethylformamide solvent, stir and disperse fully to obtain an electrospinning stock solution;

[0021] The electrospinning stock solution was spun on an electrospinning device to obtain fibers (precursor fibers). The electrospinning parameters were: spinning needle G30, spinning voltage 25kV, and spinning distance 20cm; Oxidize for 4 hours, then place the solidified viscose in a tubular carbonization furnace, raise the temperature from room temperature to 700°C at a heating rate of 5°C / min under the protection of nitrogen, carbonize at a constant temperature for 3 hours, cool down naturally and put it in the temperature Heating in 0.5M sodium hydroxide solution at 100°C for 12 hours, washing out the alkali and drying to obtain porous carbon fibers with high specific surface area. Such as figure 1 , 2 As shown, the specific surface area of ​​...

Embodiment 2

[0022] Example 2: Add 1 weight part of polyacrylonitrile and 0.2 weight part of pore-forming agent to 5 weight parts of N,N-dimethylformamide solvent, stir and disperse fully to obtain an electrospinning stock solution;

[0023] The electrospinning stock solution was spun on an electrospinning device to obtain fibers (precursor fibers). The electrospinning parameters were: spinning needle G30, spinning voltage 25kV, and spinning distance 20cm; Oxidize for 1 hour, then place the solidified viscose in a tubular carbonization furnace, raise the temperature from room temperature to 900°C at a heating rate of 5°C / min under the protection of nitrogen, carbonize at a constant temperature for 1 hour, cool down naturally and put it in the temperature Heat in 2M sodium hydroxide solution at 100°C for 12 hours, rinse the alkali and dry to obtain porous carbon fibers with high specific surface area.

Embodiment 3

[0024] Example 3: 1 part by weight of polyacrylonitrile and 0.1 part by weight of pore-forming agent were added to 10 parts by weight of N,N-dimethylformamide solvent, and fully stirred and dispersed to obtain an electrospinning stock solution;

[0025] The electrospinning stock solution was spun on an electrospinning device to obtain fibers (precursor fibers). The electrospinning parameters were: spinning needle G30, spinning voltage 25kV, and spinning distance 20cm; Oxidize for 2 hours, then place the solidified viscose in a tubular carbonization furnace, raise the temperature from room temperature to 800°C at a heating rate of 5°C / min under the protection of nitrogen, carbonize at a constant temperature for 2 hours, cool down naturally and put it in the temperature Heating in 1M sodium hydroxide solution at 100°C for 12 hours, washing out the alkali and drying to obtain porous carbon fibers with high specific surface area.

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Abstract

The invention relates to a preparation method of a porous carbon fiber with a high specific surface area. The preparation method comprises the following steps: subjecting a spinning liquid containing polyacrylonitrile, a pore forming agent, and N,N-dimethyl formamide to electrostatic spinning, then carrying out carbonization, and finally performing hot alkali washing and drying to obtain the porous carbon fiber with a high specific surface area. According to the preparation method, nano silica is taken as the pore forming agent, then silica in fibers is removed by hot alkali, and the prepared porous carbon fiber has a high specific surface and is rich in micro pores and mesopores.

Description

technical field [0001] The invention relates to the technical field of porous fiber materials, in particular to a method for preparing porous carbon fibers with high specific surface area. Background technique [0002] Due to its unique structure and characteristics, carbon fibers are widely used as macromolecular absorption materials, supercapacitors, batteries, catalyst carriers, gas or liquid filtration, and field emission display materials. Electrospinning is a very simple and efficient method for preparing carbon fibers, and has attracted widespread attention due to its low cost. However, carbon fibers prepared by ordinary electrospinning are non-porous carbon fibers with low specific surface area, which greatly limits the application of carbon fibers. In response to this shortcoming, in recent years, high specific surface porous carbon fibers and their preparation have aroused widespread research interest and become a research and development hotspot. [0003] Althou...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F1/10
Inventor 曾显华聂伟利贾永堂徐凡陈阳叶雪仪
Owner WUYI UNIV
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