A kind of lignin porous carbon nanosheet and its preparation method and application in supercapacitor electrode material

A technology of lignin and nanosheets, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, nano-carbon, etc., can solve the problems of unsuitable supercapacitor electrodes, difficult removal of silica templates, weak dispersion of solid particles, etc. problems, to achieve the effect of high value-added utilization, good application value, and environmental protection

Active Publication Date: 2020-07-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has cumbersome steps and is not easy to remove the silica template
[0008] In summary, due to the poor water solubility of industrial lignin such as alkali lignin or enzymatic lignin, the ability to disperse solid particles is weak, resulting in serious agglomeration of lignin porous carbon prepared by direct carbonization products, and random microscopic pores. It is suitable for use as a supercapacitor electrode, but the existing chemical activation method or template method has problems such as complicated process, serious corrosion of equipment, and high production cost.

Method used

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  • A kind of lignin porous carbon nanosheet and its preparation method and application in supercapacitor electrode material
  • A kind of lignin porous carbon nanosheet and its preparation method and application in supercapacitor electrode material
  • A kind of lignin porous carbon nanosheet and its preparation method and application in supercapacitor electrode material

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Experimental program
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Effect test

Embodiment 1

[0063] Weigh 5 parts by mass of sodium lignosulfonate and 5 parts by mass of zinc oxalate solid powder and dissolve them in 500 parts by volume of water, and stir evenly to obtain a stable dispersion A. Take 50 parts by volume of the dispersion liquid A, add 50 parts by volume of ethanol under stirring, and separate the precipitate after standing still to obtain a lignin / zinc oxalate composite. Then take 50 parts by volume of dispersion liquid A, add the lignin / zinc oxalate complex prepared above, stir for 20 minutes, add 50 parts by volume of ethanol, and separate the lignin / zinc oxalate complex after standing still. The above operation was repeated 6 times, and the precipitate was separated to obtain a layer-by-layer self-assembled composite lignin / zinc oxalate composite.

[0064] Place the layer-by-layer self-assembled lignin / zinc oxalate composite in an inert atmosphere, carbonize at 750°C for 3 hours to obtain a lignin carbon / zinc oxide composite, soak the product in 1mol...

Embodiment 2

[0066] Weigh 10 parts by mass of magnesium lignosulfonate and 5 parts by mass of magnesium oxalate solid powder and dissolve them in 500 parts by volume of water, and stir evenly to obtain a stable dispersion A. Take 50 parts by volume of the dispersion liquid A, add 50 parts by volume of ethanol under stirring, and separate the precipitate after standing still to obtain a lignin / magnesium oxalate composite. Then take 50 parts by volume of dispersion liquid A, add the lignin / magnesium oxalate complex prepared above, stir for 20 minutes, add 50 parts by volume of ethanol, and separate the lignin / magnesium oxalate complex after standing. The above operation was repeated 8 times, and the precipitate was separated to obtain a layer-by-layer self-assembled composite lignin / magnesium oxalate composite.

[0067] Place the layer-by-layer self-assembled lignin / magnesium oxalate composite in an inert atmosphere, carbonize at 550°C for 4 hours to obtain a lignin carbon / magnesium oxide co...

Embodiment 3

[0069]Weigh 5 parts by mass of calcium lignosulfonate and 7.5 parts by mass of calcium oxalate solid powder and dissolve them in 500 parts by volume of water, and stir evenly to obtain a stable dispersion A. Take 50 parts by volume of the dispersion liquid A, add 50 parts by volume of ethanol under stirring, and separate the precipitate after standing still to obtain a lignin / calcium oxalate composite. Then take 50 parts by volume of dispersion liquid A, add the lignin / calcium oxalate complex prepared above, stir for 20 minutes, add 50 parts by volume of ethanol, and separate the lignin / calcium oxalate complex after standing. The above operation was repeated 6 times, and the precipitate was separated to obtain a layer-by-layer self-assembled composite lignin / calcium oxalate composite.

[0070] Place the layer-by-layer self-assembled lignin / calcium oxalate composite in an inert atmosphere, carbonize at 650°C for 3 hours to obtain a lignin carbon / calcium oxide composite, soak th...

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Abstract

The invention belongs to the technical field of biomass carbon materials, and in particular relates to a lignin porous carbon nanosheet, a preparation method thereof, and an application in supercapacitor electrode materials. The preparation method of the present invention carries out layer-by-layer self-assembly of sulfonated lignin and oxalate in a selective solvent to prepare a layer-by-layer self-assembled lignin / oxalate composite, which is carbonized and pickled to obtain porous lignin carbon nanosheets. The invention provides lignin porous carbon nanosheets prepared by the above method, and its specific surface area ranges from 200 to 1500m 2 / g, the micropore specific surface area ranges from 100 to 500m 2 / g, the mesopore specific surface area ranges from 100 to 1000m 2 / g, pore size 0.5~30nm, pore volume 0.5~1.5cm 3 / g; can be applied to supercapacitor electrode materials, showing higher specific capacitance and excellent rate performance (76.6% specific capacitance retention rate), and has good potential application value.

Description

technical field [0001] The invention belongs to the technical field of biomass carbon materials, and in particular relates to a lignin porous carbon nanosheet, a preparation method thereof, and an application in supercapacitor electrode materials. Background technique [0002] The massive consumption of traditional fossil energy and the increasingly severe environmental pollution have forced countries all over the world to raise the development of green and environmentally friendly new energy to a strategic height. Electrochemical energy storage devices play a very important role in the development of green and sustainable energy storage and conversion technologies. As a new type of energy storage device between traditional physical capacitors and secondary batteries, supercapacitors are widely used in portable electronic devices and electric vehicles due to their advantages such as high power density, fast charging and discharging, long cycle life and wide applicable temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15H01G11/24H01G11/36H01G11/44
CPCH01G11/24H01G11/36H01G11/44C01B32/15Y02E60/13C01P2004/03C01P2004/04C01P2006/12C01P2006/14C01P2006/16H01G11/86H01G11/34C01P2006/40
Inventor 邱学青符方宝杨东杰王欢李致贤黄锦浩欧阳新平刘伟峰
Owner SOUTH CHINA UNIV OF TECH
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