High-specific surface porous carbon fiber, preparation method and application of carbon fiber

A technology of porous carbon fiber and high specific surface area, applied in fiber treatment, separation method, fiber chemical characteristics, etc., can solve the problems of high cost, difficult industrial production, complicated and complicated pore-making process, etc., and achieve high specific surface area and simple preparation process. Efficient and low-cost effect

Active Publication Date: 2014-06-25
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The following problems still exist in the high specific surface porous carbon fibers and their preparation methods reported in the literature at present: the pore-forming process in the method is cumbersome and complicated, the cost is high, and it is difficult to realize industrial production; the above problems greatly limit the prepared porous carbon fibers. Applications as catalyst carrier, supercapacitor and lithium-ion battery

Method used

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  • High-specific surface porous carbon fiber, preparation method and application of carbon fiber
  • High-specific surface porous carbon fiber, preparation method and application of carbon fiber
  • High-specific surface porous carbon fiber, preparation method and application of carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0061] 1) Add 0.5g of pore-forming agent potassium sulfide to 10g of organic solvent N,N-dimethylformamide to dissolve, add 1.0g of polymer polyacrylonitrile with a number average molecular weight of 150w, stir at 80°C for 1h to form a dark purple color The viscous solution is the spinning solution.

[0062] 2) The electrospinning process was carried out on a single-nozzle electrospinning device, which consisted of a DC high-voltage power supply, a single capillary spinneret, a collecting plate and a ground wire. The collecting plate was made of aluminum foil, and the electrospinning temperature was 15°C.

[0063] The specific preparation process is as follows: transfer the dark purple precursor solution prepared above into a 10mL medical syringe, inject it into the spinneret at a flow rate of 1.5mL / h, and apply a high-voltage electric field between the spinneret and the collecting plate to make the spinning solution After being stretched, thinned and solidified, the fibers ar...

Embodiment 2

[0068] 1) Add 0.5g of pore-forming agent potassium sulfide to 10g of organic solvent N,N-dimethylformamide to dissolve, add 1.0g of polymer polyacrylonitrile with a number average molecular weight of 150w, stir at 80°C for 1h to form a dark purple color The viscous solution is the spinning solution.

[0069] 2) Perform electrospinning according to step 2) of Example 1;

[0070] 3) Carry out pre-oxidation and carbonization according to step 3) of Example 1, and only replace the temperature of the carbonization step with 1000°C. After cooling down to room temperature, put the black carbon fiber membrane into 2M sulfuric acid solution and wash it for 1 hour to remove sulfuration Potassium, finally washed and dried to obtain high specific surface carbon fiber.

[0071] image 3 It is the nitrogen adsorption-desorption curve of the carbon fiber, and there is a relatively high adsorption amount in the micropore absorption range where the relative pressure is below 0.05, indicating...

Embodiment 3

[0074] 1) Add 0.3g of pore-forming agent potassium sulfide to 10g of organic solvent N,N-dimethylformamide to dissolve, add 1.0g of polymer polyacrylonitrile with a number average molecular weight of 150w, stir at 80°C for 1h to form a dark purple color The viscous solution is the spinning solution.

[0075] 2) Perform electrospinning according to step 2) of Example 1, only the electrospinning temperature is replaced by 30°C, the flow rate is replaced by 1.0mL / h, and the working voltage is replaced by 30kV;

[0076] 3) Perform pre-oxidation, carbonization and pickling according to step 3) of Example 1, only the pre-oxidation temperature is replaced with 230°C, and the carbonization temperature is replaced with 1000°C.

[0077] Figure 5 It is the nitrogen adsorption-desorption curve of the carbon fiber, and there is a relatively high adsorption amount in the micropore absorption range where the relative pressure is below 0.05, indicating that the carbon fiber has a large numb...

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Abstract

The invention discloses a high-specific surface porous carbon fiber and a preparation method of the carbon fiber. The method comprises the following steps: spinning through a spinning solution consisting of a pore forming substance, a high polymer and an organic solvent, carbonizing, and carrying out pickling to obtain the high-specific surface carbon fiber. The method has the following advantages that (a) the porous carbon fiber is simple to prepare, high in yield and low in cost; (b) the porous carbon fiber with high specific surface can be prepared through the method; (c) the carbon fiber simultaneously has micro-porous and mesoporous structures.

Description

technical field [0001] The present invention relates to a carbon fiber and its preparation method and application, in particular to a high specific surface porous carbon fiber and its preparation method and application. 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 it has attracted widespread attention due to its low cost. However, carbon fibers prepared by ordinary electrospinning methods are carbon fibers with non-porous structure and low specific surface area, which greatly limits the application of carbon fibers. In view of this shortcoming, in recent years, high specific surface porous carbon fibers and their preparation have aroused extensive research interest and become a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F9/24D01F9/145D01F9/21D01F11/12D01D5/00B01J32/00B01J21/18B01J35/06B01D39/06
Inventor 宋卫国刘华曹昌燕
Owner INST OF CHEM CHINESE ACAD OF SCI
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