A preparation method of nitrogen-doped low-temperature carbon nanofiber electrode material for supercapacitor

A carbon nanofiber and supercapacitor technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of low capacitor energy density, complex synthesis process, and low specific capacitance, and achieve good electrochemical performance , Increase the amount of nitrogen doping, the effect of large specific surface area

Active Publication Date: 2021-09-07
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for preparing a nitrogen-doped low-temperature carbon nanofiber electrode material for supercapacitors, which solves the problems of low specific capacitance, low energy density of capacitors and synthesis of existing electrode materials. Complex process, high energy consumption and high cost

Method used

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  • A preparation method of nitrogen-doped low-temperature carbon nanofiber electrode material for supercapacitor
  • A preparation method of nitrogen-doped low-temperature carbon nanofiber electrode material for supercapacitor
  • A preparation method of nitrogen-doped low-temperature carbon nanofiber electrode material for supercapacitor

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Effect test

Embodiment 1

[0030] 1) Place the powder catalyst copper tartrate in a quartz boat, spread it evenly, and then place it in a heating tube, under the protection of high-purity nitrogen, raise the temperature to 240 ° C, feed acetylene, and keep it warm for 1 hour, and wait for the reaction After finishing, cool down to room temperature under the protection of nitrogen, take out the sample, and obtain low-temperature carbon nanofibers.

[0031] 2) Accurately weigh the low-temperature carbon nanofibers obtained in step 1) and KOH at a mass ratio of 1:1, heat up to 800°C under the protection of high-purity nitrogen, activate for 1 hour, add a large amount of distilled water, and filter through a sand core funnel to obtain precipitate, and repeatedly wash the precipitate with distilled water and absolute ethanol until the solution becomes neutral, and finally dry it in a vacuum oven at 80° C. to obtain activated carbon nanofibers.

[0032] 3) Put the activated carbon nanofiber and melamine nitro...

Embodiment 2

[0035] 1) Place the powder catalyst copper tartrate in a quartz boat, spread it evenly, and then place it in a heating tube. Under the protection of high-purity nitrogen, the temperature rises to 260 ° C, and acetylene is introduced and kept for 1 hour until the reaction is completed. Afterwards, it was cooled to room temperature under the protection of nitrogen, and the samples were taken out to obtain low-temperature carbon nanofibers.

[0036] 2) Accurately weigh the low-temperature carbon nanofibers obtained in step 1) and KOH at a mass ratio of 1:2, heat up to 800°C under the protection of high-purity nitrogen, activate for 3 hours, add a large amount of distilled water, and filter through a sand core funnel to obtain precipitate, and repeatedly wash the precipitate with distilled water and absolute ethanol until the solution becomes neutral, and finally dry it in a vacuum oven at 80° C. to obtain activated carbon nanofibers.

[0037] 3) Put the activated carbon nanofiber...

Embodiment 3

[0040] 1) Put the powder catalyst copper tartrate in a quartz boat, spread it evenly, and then place it in a heating tube, under the protection of high-purity nitrogen, the temperature rises to 280 ° C, feed acetylene, and keep it warm for 1 hour, and wait for the reaction to complete Afterwards, it was cooled to room temperature under the protection of nitrogen, and the samples were taken out to obtain low-temperature carbon nanofibers.

[0041] 2) Accurately weigh the low-temperature carbon nanofibers obtained in step 1) and KOH at a mass ratio of 1:3, heat up to 800°C for 2 hours under the protection of high-purity nitrogen, add a large amount of distilled water, and filter through a sand core funnel to obtain precipitate, and repeatedly wash the precipitate with distilled water and absolute ethanol until the solution becomes neutral, and finally dry it in a vacuum oven at 80° C. to obtain activated carbon nanofibers.

[0042] 3) Put the activated carbon nanofiber and melam...

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Abstract

The invention discloses a method for preparing a nitrogen-doped low-temperature carbon nanofiber electrode material for a supercapacitor. Firstly, the low-temperature carbon nanofiber (CNF) is prepared by CVD, and then the surface is activated at high temperature, and then nitrogen-containing organic matter is used to prepare the carbon nanofiber (CNF) at high temperature. Nitrogen doping and acidification treatment are carried out to obtain the electrode material. The low-temperature carbon nanofibers in the electrode material have developed micropores and mesoporous structures, can absorb a large amount of electrolyte ions, and have high specific capacity, and the nitrogen-containing functional groups doped on the surface of the carbon fiber material can improve the wettability of the material and increase the The utilization rate of the specific surface area can also change the local charge density and improve the conductivity. The nitrogen-containing functional group can also undergo redox reactions to generate pseudocapacitance and further improve the capacitance performance. The electrode material of the invention has high specific capacity, excellent rate performance and cycle stability, simple and easy-to-operate synthesis process, no need for electrospinning, low cost and high yield, and has good application prospects in supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, in particular to a method for preparing a nitrogen-doped low-temperature carbon nanofiber electrode material for supercapacitors. Background technique [0002] Due to the increasing shortage of non-renewable energy sources such as oil, and the tail gas produced by burning oil is becoming more and more serious to the environment. Researchers from all over the world are looking for clean energy and new energy devices that use energy more efficiently. As a new type of energy storage device, supercapacitor has the characteristics of large specific capacity, high power density, long cycle life, wide operating temperature and environmental friendliness. It is widely used in the fields of electronics, energy, transportation, aerospace and defense, and has become a global research topic. focus of attention. [0003] Compared with conventional batteries, supercapacitors have high power density b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/36H01G11/86H01G11/24
CPCH01G11/24H01G11/36H01G11/86Y02E60/13
Inventor 陈建侯圣平张贤耀廖明东彭川
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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