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Tungsten selenide/graphene/carbon nanofiber composite material and preparing method thereof

A carbon nanofiber and composite material technology, applied in the direction of carbon fiber, fiber treatment, artificial filament of inorganic raw materials, etc., can solve the problems of low electrochemical activity, low density specific surface area, and restricted performance of electrospun carbon nanofibers, and achieve Excellent electrical conductivity and electrochemical activity, good self-support and flexibility, and ingenious design ideas

Inactive Publication Date: 2017-09-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional carbon fiber cloth, electrospun carbon nanofibers have lower density and higher specific surface area, but limited by lower carbonization temperature and smaller fiber microscopic diameter, electrospun carbon nanofibers usually have poor mechanical strength. , low conductivity
In addition, as more and more researchers apply electrospun nanofiber materials to new energy storage materials, the low electrochemical activity of electrospun carbon nanofibers also seriously restricts their performance.
Therefore, it is still challenging to find a cost-effective method to enhance the electrical conductivity and electrochemical activity of electrospun carbon fibers.

Method used

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  • Tungsten selenide/graphene/carbon nanofiber composite material and preparing method thereof
  • Tungsten selenide/graphene/carbon nanofiber composite material and preparing method thereof
  • Tungsten selenide/graphene/carbon nanofiber composite material and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] This embodiment includes the following steps:

[0043] Weigh 0.8 g of polyacrylonitrile powder and add 10 mL of N,N-dimethylformamide, and stir at high speed for 4 hours under heating in an oil bath at 80°C to obtain a transparent polyacrylonitrile solution with a yellowish color. Electrospinning is carried out on the above polyacrylonitrile solution, and the spinning process conditions are set as follows: flow rate 0.25mm / min, voltage 18kV, receiving distance 12cm. The prepared polyacrylonitrile nanofibers are finally deposited on the drum receiver in the form of nanofiber membranes, and the fiber membranes are removed and dried in a vacuum oven for 24-28 hours to remove residual solvents. The prepared polyacrylonitrile fiber membrane was fixed on a plate and placed in a programmed temperature-controlled oven for pre-oxidation treatment. The temperature was raised from room temperature to 250 °C at a rate of 1 °C / min and kept for 1 h, and then naturally cooled to room ...

Embodiment 2

[0049] This embodiment includes the following steps:

[0050] The graphene oxide prepared by the Hummers method was sonicated for 2 h to obtain a graphene oxide dispersion with a concentration of 1 mg / mL. Take 80 mg of the above-mentioned oxidized polyacrylonitrile fiber membrane and add it to 100 mL of graphene oxide dispersion and let it stand at room temperature for 48 hours, then take out the fiber membrane and rinse off the graphene oxide dispersion on the surface with absolute ethanol, and dry it in a constant temperature oven at 70°C for 48 hours . The above-mentioned graphene oxide / oxidized polyacrylonitrile nanofiber membrane was placed in a temperature-programmed tube furnace for high-temperature carbonization treatment. The carbonization conditions were as follows: the temperature was raised from room temperature to 1000°C at a heating rate of 10°C / min and kept for 1h. Cool down naturally. Finally, a graphene / carbon nanofiber composite material is obtained.

Embodiment 3

[0052] This embodiment includes the following steps:

[0053] A certain amount of selenium powder was weighed and added to the hydrazine hydrate solution, heated and stirred in an oil bath at 85° C. for 1 h to obtain a brown transparent selenium solution with a molar concentration of 2 mM, and cooled at room temperature for use. Weigh a certain amount of sodium tungstate crystals and add it into N,N-dimethylformamide to prepare a sodium tungstate solution with a molar concentration of 1mM. Weigh 10mg of graphene / carbon nanofiber composite material and add it to the above mixed solution of 10mL selenium solution and 10mL sodium tungstate, transfer it to a polytetrafluoroethylene-lined reaction kettle, and place it in a constant temperature oven at 220°C for 12 hours Then take it out, wash and dry to obtain the tungsten selenide / graphene / carbon nanofiber composite material.

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Abstract

The invention provides a tungsten selenide / graphene / carbon nanofiber composite material and a preparing method thereof. The preparing method comprises the steps of 1, preparing a polyacrylonitrile spinning solution; 2, preparing polyacrylonitrile nanofiber; 3, conducting pre-oxidation treatment on the polyacrylonitrile nanofiber; 4, preparing graphene oxide dispersion liquid; 5, soaking the polyacrylonitrile oxide nanofiber into the graphene oxide dispersion liquid to conduct self-assembly to obtain graphene oxide / polyacrylonitrile oxide nanofiber; 6, conducting high temperature carbonization on the graphene oxide / polyacrylonitrile oxide nanofiber to obtain a graphene / carbon nanofiber composite material; 7, growing tungsten selenide nanosheets on the surface of the graphene / carbon nanofiber composite material to obtain the tungsten selenide / graphene / carbon nanofiber composite material. The preparing method of the tungsten selenide / graphene / carbon nanofiber composite material is simple in preparing process and easy to operate, and the adopted raw materials are low in cost and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of functionalized carbon nanofibers, in particular to a tungsten selenide / graphene / carbon nanofiber composite material and a preparation method thereof. Background technique [0002] Carbon fiber is a new type of fiber material with a carbon content of more than 95%. Its weight is lighter than metal aluminum, but its strength is higher than that of steel, and it has the characteristics of corrosion resistance and high modulus. It is important in national defense and civilian applications. Material. At the same time, the good electrical and thermal conductivity of carbon fiber makes it have broad application prospects in the field of next-generation energy storage and conversion. [0003] As a convenient and low-cost nanofiber preparation technology, electrospinning technology can prepare nanofiber nonwoven materials with large specific surface area and high porosity. Carbon nanofiber nonwoven materials can be obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01F9/22D06M11/52D06M101/40
CPCD01F9/08D01F9/22D06M11/52D06M2101/40
Inventor 黄云鹏袁寿其李华明崔芬赵岩包健
Owner JIANGSU UNIV
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