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Preparation method of graphene nano-fiber and super-capacitor application thereof

A nanofiber and graphene technology, used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve problems such as small specific surface area, and achieve the effect of increasing specific surface area, improving reactivity, and enhancing adsorption.

Active Publication Date: 2013-07-10
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been some research reports on the use of electrospun carbon nanofibers in supercapacitors (Advanced Materials2007, 19, 2341–2346; Journal of Power Sources2007, 196, 9862–9867). Most of the currently prepared electrospun carbon nanofibers have a diameter of more than 100nm and a flat surface. , the specific surface area is small

Method used

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  • Preparation method of graphene nano-fiber and super-capacitor application thereof
  • Preparation method of graphene nano-fiber and super-capacitor application thereof
  • Preparation method of graphene nano-fiber and super-capacitor application thereof

Examples

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Embodiment 1

[0043] Implementation Example 1: Preparation of Graphene Nanofibers

[0044] PAN was dissolved in dimethylformamide (DMF) solvent to prepare an electrospinning solution with a mass volume concentration (wt / v) of 3%, and electrospinning was performed using conventional electrospinning equipment to prepare precursor fibers. The PAN used was purchased from Aldrich Company, molecular weight Mw=150000. The high-voltage power supply used in electrospinning is the DW-P503-2ACCD high-voltage power supply produced by Dongwen High Voltage Power Supply (Tianjin) Co., Ltd., with a maximum voltage of 50kV. Graphite paper was used as the collecting base during electrospinning, the distance between the spinneret and the collecting base was 15 cm, and the voltage was set at 20 kV.

[0045] Then the PAN fibers prepared by electrospinning were put into a conventional tube furnace for stabilization in an air environment. Heating to 250°C at a heating rate of 5°C / min, keeping the temperature fo...

Embodiment 2

[0049] Implementation Example 2: Preparation of Graphene Nanofibers

[0050] In this embodiment, the concentration of the PAN solution used in the electrospinning of the precursor fiber is 5%, and the other conditions are the same as in Embodiment 1.

[0051] image 3 It is the SEM photo of the prepared fiber. Many radially grown graphene sheets can be clearly seen on the surface of the fiber. Compared with Example 1, the fiber diameter becomes larger, which is due to the increase of the concentration of the electrospinning solution used so that the precursor The diameter of bulk PAN fibers becomes larger. Figure 4 It is the HRTEM photo of the prepared fiber, it can be seen that the thickness of the graphene sheet is 1-4 atomic layers.

Embodiment 3

[0052] Implementation Example 3: Preparation of Graphene Nanofibers

[0053] In this implementation example, the carbonization stage is fed into NH3 and N2 Mixed gas, NH3 and N2 The flow rate is 40mL / min, and other conditions are all the same as in Example 1.

[0054] Figure 5 It is the HRETM photo of the prepared fiber, and the thickness of the graphene sheet is significantly increased compared with the implementation example 1, reaching 5-7 layers, which is due to the NH in the atmosphere 3 The concentration of ions is reduced to reduce the rate of the etching reaction.

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Abstract

The invention relates to a preparation method of a graphene nano-fiber and super-capacitor application of the preparation method of the graphene nano-fiber. The preparation method of the graphene nano-fiber includes the following steps: (1) an electrostatic spinning method is utilized to prepare a polymer fiber; (2) the polymer fiber obtained by the method is conducted with stabilizing treatment in appropriate temperature and in an oxygen-bearing atmosphere; (3) the fiber after the stabilizing treatment is conducted with carbonization thermal treatment in an NH3-bearing atmosphere and in appropriate temperature. The surface of the prepared graphene nano-fiber is provided with a graphene sheet which grows along the radial direction, and the thickness of the graphene sheet is 1 to 10 atomic layers. The graphene nano-fiber integrates the advantages of graphene and carbon nanofibers, solves the problems of graphene agglomeration and recrystallization, is high in surface activity and has various application values. The graphene nano-fiber is utilized to serve as a super-capacitor of electrode material preparation. Therefore, compared with the prior art, the preparation method of the graphene nano-fiber and the super-capacitor application of the preparation method of the graphene nano-fiber have good performance. The working voltage reaches 1.8-2.2 volts; the energy density reaches 41.3 watt hour / kilogram; and the specific capacitance in acid can reach 300 F / g.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a preparation method of graphene nanofibers and an application of super capacitors thereof. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and batteries. It has the advantages of high power density, fast charge and discharge, long cycle life, stable performance, environmental friendliness, abundant and cheap raw materials (Chemical Society Reviews2012, 41,797 -828; Nature Materials 2008, 7, 845-854). According to the energy storage mechanism, supercapacitors can be divided into two categories, one is electric double layer capacitors, and the other is pseudocapacitors. Electric double layer capacitors use materials with a large specific surface area to achieve high-efficiency storage of electricity. When the electrodes are charged, the charges on the electrode surfaces attract the opposite-sex ions in the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/86H01G11/84
CPCY02E60/13
Inventor 于杰赵磊邱业君
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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