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Preparation method of composite carbon nanofibers with high specific surface area

A technology of nano-carbon fiber and high specific surface, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems such as electrode materials of activated carbon fiber supercapacitors that have not been seen, and achieve improved pore structure and source The effect of enriching and simplifying the preparation process

Inactive Publication Date: 2016-04-20
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it is reported in the literature that CA and PAN are composited and electrospun to prepare composite fiber membranes, there is no report on the preparation of activated carbon fibers by heat treatment and their application in supercapacitor electrode materials.

Method used

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  • Preparation method of composite carbon nanofibers with high specific surface area
  • Preparation method of composite carbon nanofibers with high specific surface area
  • Preparation method of composite carbon nanofibers with high specific surface area

Examples

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Effect test

example 1

[0027] Electrospinning: Weigh 3g of cellulose acetate into a conical flask, add 27g of DMF (dimethylformamide), stir magnetically at 60°C for 4h and then let it stand for 1h to obtain a uniform and transparent mass fraction 10% spinning solution. The ambient temperature of electrospinning is ≤40°C, the humidity is ≤30%, the spinning voltage: 16kV, the spinning speed: 0.1mm / min, and the spinning distance: 16cm.

[0028] Pre-oxidation: in an air atmosphere, the pre-oxidation temperature is 250°C, the heating rate is 1°C / min, and the holding time is 2h; carbonization: in a nitrogen atmosphere, the carbonization temperature is 800°C, the heating rate is 1°C / min, and the holding time is 2h; Activation: The activator is potassium hydroxide, the mass ratio of potassium hydroxide to carbon fiber is 3 / 4, and it is prepared into a 1wt% KOH solution to impregnate the carbon fiber for 2 hours, then dry at 150°C, and the activation temperature is 800°C under a nitrogen atmosphere. °C, the...

example 2

[0031] Electrospinning: Weigh 2.4g of cellulose acetate and 0.6g of PAN (polyacrylonitrile) into a conical flask, add 27g of DMF, stir magnetically at 60°C for 4h and then let it stand for 1h to obtain a uniform and transparent Spinning solution with a mass fraction of 10%. The ambient temperature of electrospinning is ≤40°C, the humidity is ≤30%, the spinning voltage: 18kV, the spinning speed: 0.2mm / min, and the spinning distance: 17cm.

[0032] Pre-oxidation: in an air atmosphere, the pre-oxidation temperature is 250°C, the heating rate is 2°C / min, and the holding time is 2h; carbonization: under a nitrogen atmosphere, the carbonization temperature is 800°C, the heating rate is 2°C / min, and the holding time is 2h; Activation: The activator is potassium hydroxide, the mass ratio of potassium hydroxide to carbon fiber is 3 / 4, and it is prepared into a 1wt% KOH solution to impregnate the carbon fiber for 2 hours, then dry at 150°C, and the activation temperature is 800°C under ...

example 3

[0035]Electrospinning: Weigh 1.8g of cellulose acetate and 1.2g of polyacrylonitrile into a conical flask, add 27g of DMF, stir magnetically at 60°C for 4h and then let it stand for 1h to obtain a uniform and transparent mass fraction 10% spinning solution. The ambient temperature of electrospinning is ≤40°C, the humidity is ≤30%, the spinning voltage: 19kV, the spinning speed: 0.3mm / min, and the spinning distance: 18cm.

[0036] Pre-oxidation: in an air atmosphere, the pre-oxidation temperature is 250°C, the heating rate is 3°C / min, and the holding time is 2h; carbonization: under a nitrogen atmosphere, the carbonization temperature is 800°C, the heating rate is 3°C / min, and the holding time is 2h; Activation: The activator is potassium hydroxide, the mass ratio of potassium hydroxide to carbon fiber is 3 / 4, and it is prepared into a 1wt% KOH solution to impregnate the carbon fiber for 2 hours, then dry at 150°C, and the activation temperature is 800°C under a nitrogen atmosp...

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Abstract

A preparation method of composite carbon nanofibers with a high specific surface area relates to the technical field of preparation of electrode materials of super capacitors, and comprises the following steps: mixing cellulose acetate and polyacrylonitrile to obtain a spinning solution; carrying out electrospinning to obtain CA / PAN precursors; pre-oxidazing the CA / PAN precursors; carrying out carbonization and actification to obtain CA / PAN activated carbon fibers; mixing the CA / PAN activated carbon fibers with acetylene black, PTFE and ethanol to obtain a mixture; putting the mixture into an oven; drying the mixture into paste; smearing the paste on nickel foam; carrying out drying and tabletting to obtain the CA / PAN composite carbon fiber electrode material. As cellulose acetate contains a large quantity of oxygen-containing groups, and has double functions of pore-forming and chemical surface modification, the hole structure, the specific capacitance and the specific surface area are greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparation of electrode materials for supercapacitors. technical background [0002] Supercapacitors are a new type of energy storage element between traditional capacitors and chemical power sources. According to the energy storage mechanism, they can be divided into two types: electric double layer and pseudocapacitor. The core working principle of the electric double layer is that under a certain electric field, the surface of the electrode plate will form a tight charge layer due to the directional movement of the charges, that is, the electric double layer, thereby generating a capacitive effect; and the charge (specific capacitance) of this charge layer The amount depends first on the size of the specific surface area of ​​the electrode material. [0003] Carbon materials are widely used as electrode materials for electric double layer capacitors due to their rich pores and high specific surface a...

Claims

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Application Information

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IPC IPC(8): D01F9/16D01F9/22H01G11/40H01G11/26H01G11/24B82Y30/00B82Y40/00
CPCY02E60/13D01F9/16B82Y30/00B82Y40/00D01F9/22H01G11/24H01G11/26H01G11/40
Inventor 贾哲华贾成浩赵有华董斌徐继任陶翠
Owner YANGZHOU UNIV
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