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Graphene/ lignin-based activated carbon preparation method and application in supercapacitors

A technology based on lignin and activated carbon, which is applied in the chemical industry, can solve the problems of graphene agglomeration cost and low conductivity of activated carbon, and achieve the effects of improved reuse, increased sources, and larger specific capacitance

Inactive Publication Date: 2015-04-29
江苏江大环保科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low conductivity of activated carbon, severe graphene agglomeration and high cost in the prior art, the invention provides a preparation method of graphene and activated carbon composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix and dissolve 3 g lignin and 9 g potassium hydroxide in 50 mL deionized water, stir in a constant temperature water bath at 70 °C for 2 hours, evaporate the solvent slowly, place in a tube furnace, and heat at 5 °C / The temperature was raised to 850 °C for 1 hour at a constant temperature, cooled and taken out, washed with water until neutral, filtered with suction, and vacuum-dried at 70 °C to obtain lignin-based activated carbon. Weigh 0.25 g of graphite oxide and ultrasonically disperse it in deionized water to form a stable graphene oxide dispersion, add 2.25 g of lignin-based activated carbon, add 24 mM glutaraldehyde, 12 mM resorcinol, 0.08 mM borax, and ultrasonically react for 2 hours, filtered, and dried at 60°C to obtain graphite oxide / lignin-based activated carbon composites. Weigh 3 g of graphite oxide / lignin-based activated carbon composite and 9 g of potassium hydroxide, ultrasonically disperse in deionized water, stir at 60 °C for 3 hours, filter and d...

Embodiment 2

[0030] Mix and dissolve 3 g lignin and 12 g potassium hydroxide in 50 mL deionized water, stir in a constant temperature water bath at 70 °C for 2 hours, evaporate the solvent slowly, place in a tube furnace, and heat at 5 °C / The temperature was raised to 750 °C for 2 hours at a constant temperature, cooled and taken out, washed with water until neutral, filtered with suction, and vacuum-dried at 70 °C to obtain lignin-based activated carbon. Weigh 0.25 g of graphite oxide and ultrasonically disperse it in deionized water to form a stable graphene oxide dispersion, add 2.5 g of lignin-based activated carbon, add 24 mM glutaraldehyde, 12 mM resorcinol, 0.08 mM borax, and ultrasonically react for 2 hours, filtered, and dried at 60°C to obtain graphite oxide / lignin-based activated carbon composites. Weigh 3 g of graphite oxide / lignin-based activated carbon composite and 12 g of potassium hydroxide, ultrasonically disperse in deionized water, stir at 60 °C for 2 hours, filter and...

Embodiment 3

[0032] Mix and dissolve 3 g lignin and 15 g potassium hydroxide in 50 mL deionized water, stir in a constant temperature water bath at 70 °C for 2 hours, evaporate the solvent slowly, place in a tube furnace, and heat at 5 °C / The temperature was raised to 650 °C for 3 hours at a constant temperature, cooled and taken out, washed with water until neutral, filtered with suction, and vacuum-dried at 70 °C to obtain lignin-based activated carbon. Weigh 0.25 g of graphite oxide and ultrasonically disperse it in deionized water to form a stable graphene oxide dispersion, add 2 g of lignin-based activated carbon, add 24 mM glutaraldehyde, 12 mM resorcinol, 0.08 mM borax, and ultrasonically react for 3 hours, filtered, and dried at 60°C to obtain graphite oxide / lignin-based activated carbon composites. Weigh 3 g of graphite oxide / lignin-based activated carbon composite and 15 g of potassium hydroxide, ultrasonically disperse in deionized water, stir at 60 °C for 4 hours, filter and d...

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Abstract

The invention belongs to the field of chemistry, provides a graphene / lignin-based activated carbon preparation method and application in supercapacitors. The method includes the steps that 1, lignin-based activated carbon is prepared; 2, graphite oxide and the activated carbon are mixed, and a graphite oxide / lignin-based activated carbon compound is obtained; 3, pyrolysis reduction is conducted on the compound obtained after alkaline activation is conducted, and graphene / lignin-based activated carbon composite material is prepared; 4, electrode plates are prepared. Compared with the prior art, the obtained graphene / lignin-based activated carbon has a larger specific surface, lower mass transfer resistance and more excellent electric conductivity. Furthermore, the composite graphene / lignin-based activated carbon is applied to electrode material of the supercapacitors, and the cost and performance are greatly superior to those of existing activated carbon material.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a preparation method of graphene / lignin-based activated carbon and its application in supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage device developed in the 1970s and 1980s. It is a power source with special properties between traditional capacitors and batteries. It mainly relies on electric double layers and redox pseudocapacitance to store electrical energy. , which is different from traditional chemical power sources. The outstanding advantages of supercapacitors are high power density, short charge and discharge time, long cycle life and wide operating temperature range. They have broad application prospects in national defense, railways, electric vehicle electronics, communications, aerospace and other fields. According to different energy storage mechanisms, supercapacitors can be divided into three categories: electric doubl...

Claims

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Application Information

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IPC IPC(8): H01G11/34H01G11/36H01G11/26H01G11/86
CPCY02E60/13H01G11/34H01G11/26H01G11/36H01G11/86
Inventor 李在均殷园园蔡金飞张明
Owner 江苏江大环保科技开发有限公司
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