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Nitrogen-doped ordered porous high-conductivity graphene fiber, preparation method and application thereof

A technology of graphene fiber and nitrogen doping, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of electrochemical performance improvement and limited space for improvement, no simultaneous realization, poor electrochemical performance, etc. , to achieve the effect of being conducive to electron transmission, good toughness, and improving the total capacitance

Active Publication Date: 2017-10-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although some progress has been made in the research on graphene fiber supercapacitors at home and abroad, its electrochemical performance is still unsatisfactory.
The reason is that the current graphene fibers prepared by various methods have not simultaneously realized the double-layer capacitance of carbon materials and the creation of additional pseudocapacitance, so the improvement and improvement of electrochemical performance are very limited.

Method used

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  • Nitrogen-doped ordered porous high-conductivity graphene fiber, preparation method and application thereof
  • Nitrogen-doped ordered porous high-conductivity graphene fiber, preparation method and application thereof
  • Nitrogen-doped ordered porous high-conductivity graphene fiber, preparation method and application thereof

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Embodiment 1

[0049] Using 160-mesh natural graphite flakes as raw materials, the graphene oxide aqueous solution was prepared according to the Hummers improved method, and after centrifugation and concentration at a speed of 12,000 rpm or more for 50 minutes, a 14 mg / mL graphene oxide dispersion was obtained; 30 mL of the graphene oxide was dispersed solution and 210 mg urea (mass ratio of graphene oxide to urea is 1:0.5) were fully stirred and mixed evenly, and the above mixed solution was injected into a polytetrafluoroethylene cylinder with an inner diameter of 3 mm through a needle at an extrusion speed of 20 mL / h. Shaped microchannel and sealed at both ends, placed in an oven and heated at 90°C for 4h, then hydrothermally reacted at 160°C for 5h to obtain amino-functionalized graphene fibers; then cooled the cylindrical microchannel to room temperature Open the seals at both ends and dry at 90°C to obtain dehydrated amino-functionalized graphene fibers; the dried amino-functionalized g...

Embodiment 2

[0056] Using 100-mesh natural graphite flakes as raw materials, the graphene oxide aqueous solution was prepared according to Hummers' improved method, and after centrifugation and concentration at a speed of more than 13,000 rpm for 60 minutes, a 20 mg / mL graphene oxide dispersion was obtained; 30 mL of the graphene oxide dispersion was obtained. solution and 150 mg urea (mass ratio of graphene oxide to urea is 1:0.25) were fully stirred and mixed evenly, and the above mixed solution was injected into a polytetrafluoroethylene cylinder with an inner diameter of 4 mm through a needle at an extrusion speed of 10 mL / h. Shaped microchannel and sealed at both ends, placed in an oven and heated at 100°C for 1h, then hydrothermally reacted at 180°C for 4h to obtain amino-functionalized graphene fibers; then cooled the cylindrical microchannel to room temperature Open the seals at both ends, and dry at 80°C to obtain dehydrated amino-functionalized graphene fibers; place the dried ami...

Embodiment 3

[0060] Using 500-mesh natural graphite flakes as raw material, the graphene oxide aqueous solution was prepared according to Hummers' improved method, and after centrifugation and concentration at a speed of more than 10,000 rpm for 30 minutes, a graphene oxide dispersion of 8 mg / mL was obtained; 30 mL of the graphene oxide dispersion was obtained. Liquid and 1200mg of dicyandiamide (the mass ratio of graphene oxide and dicyandiamide is 1:5) are fully stirred and mixed evenly, and the above-mentioned mixture is injected through a needle with an inner diameter of 8 mm at an extrusion speed of 100mL / h. In the glass cylindrical microchannel and sealed at both ends, put it in an oven and heat it at 70°C for 6h, then hydrothermally react at 140°C for 10h to obtain amino-functionalized graphene fibers; then the cylindrical slender pipe After cooling to room temperature, open the seals at both ends, and dry at 100°C to obtain dehydrated amino-functionalized graphene fibers with furthe...

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Abstract

The invention relates to a nitrogen-doped ordered porous high-conductivity graphene fiber, a preparation method and application thereof. The nitrogen-doped ordered porous high-conductivity graphene fiber is characterized in that the mass doping amount range of active nitrogen is 0.7-26.3%; and the fiber diameter is 25-350 micrometers. The nitrogen-doped ordered porous high-conductivity graphene fiber is prepared according to the steps of preparing a high-concentration graphene oxide dispersion according to a Hummers improved method through using natural graphite flakes as a raw material; sufficiently mixing the graphene oxide dispersion and water-soluble nitrogen-containing precursor to be even, injecting the mixture into a cylindrical elongated pipe and sealing two ends of the pipe, performing heating and pre-reduction for obtaining an amino functionalized graphene fiber; opening the sealing part at two ends, performing drying for obtaining a dewatered amino functionalized graphene fiber; and performing heating and temperature keeping on the condition of continuous gas protection, thereby obtaining the nitrogen-doped ordered porous high-conductivity graphene fiber. The nitrogen-doped ordered porous high-conductivity graphene fiber has advantages of low cost, simple process, environment-friendly performance, and high suitability for large-scale industrial production. Furthermore a prepared capacitor has advantages of high flexibility, high specific capacitance, high circularity, and high suitability for many fields of energy storage, flexible wearable electronic devices, etc.

Description

technical field [0001] The invention relates to the field of graphene fibers, in particular to a nitrogen-doped ordered porous highly conductive graphene fiber and its preparation method and application. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a brand new energy storage element based on the theory of interfacial double layers proposed by German physicist Helmholtz. According to different energy storage principles, it can be divided into electric double layer capacitors and pseudocapacitors. The former mainly uses porous carbon materials as electrodes, while the latter mainly uses metal oxides or conductive polymers as electrode materials. Compared with fuel cells and lithium-ion batteries, it has higher power density, faster charge and discharge speed and longer cycle life. Among them, the one-dimensional fiber supercapacitor composed of flexible conductive fiber electrodes has increasingly become a research hotspot due t...

Claims

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Application Information

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IPC IPC(8): H01G11/40H01G11/26H01G11/86
CPCH01G11/26H01G11/40H01G11/86Y02E60/13
Inventor 武观陈苏谭鹏峰吴兴江
Owner NANJING UNIV OF TECH
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