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Method for preparing three-dimensional graphene by adopting ethyl cellulose as raw material

A technology of ethyl cellulose and graphene, applied in the field of graphene, can solve problems such as unfavorable large-scale production, high production cost, complicated process, etc., and achieve the effects of strong feasibility, easy cost, and simple process equipment

Inactive Publication Date: 2016-04-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The currently reported methods for preparing three-dimensional graphene are mainly template-CVD method [Zongping Chen, Wencai Ren, Libo Gao, Bilu Liu, Songfeng Pei and Hui-Ming Cheng, Three-dimensional flexible and conductive interconnected graphene networks grown by chemical vapor deposition [J], Nature Materials, 10, 424–428 (2011)], graphene oxide self-assembly 法[YuxiXu,ZhaoyangLin,FlexibleSolid-StateSupercapacitorsBasedonThreeDimensionalGrapheneHydrogelFilms[J].ACSNANO,5,4042-4049(2013]、生物碳合成法[Xiang-FenJiang,Xue-BinWang,High-throughputfabricationofstruttedgraphenebyammonium-assistedchemicalblowingforhigh-performancesupercapacitors[J],Nanoenergy, 2015,16:81-90] Among them, the template-CVD method needs to sacrifice the template and use non-renewable resources such as methane as raw materials for production, resulting in high production costs and low yields
The graphene oxide self-assembly method needs to prepare graphene oxide as a precursor, the process is complicated, the production cost is high, and it is not conducive to large-scale production

Method used

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  • Method for preparing three-dimensional graphene by adopting ethyl cellulose as raw material
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Effect test

Embodiment 1

[0029] A kind of method that adopts ethyl cellulose to prepare three-dimensional graphene as raw material, comprises the following steps:

[0030] 1) Dissolve analytically pure ethylcellulose and NaOH in a molar ratio of 1:1 in an appropriate amount of ethanol (the mass ratio of ethanol:ethylcellulose and NaOH mixture is 20:1) to prepare a sol;

[0031] 2) aging the prepared sol at room temperature for 12 hours to obtain a gel;

[0032] 3) drying the obtained gel at 60°C for 6 hours to obtain a xerogel;

[0033] 4) The dry gel is carbonized with argon as a protective gas and kept at 900°C for 3 hours;

[0034] 5) The carbonized product was washed with deionized water until the pH of the solution was 6.8, and the solution was suction-filtered to obtain the product, which was dried at 60° C. for 5 hours to obtain three-dimensional graphene.

Embodiment 2

[0036] A kind of method that adopts ethyl cellulose to prepare three-dimensional graphene as raw material, comprises the following steps:

[0037] 1) Dissolve analytically pure ethylcellulose and NaOH in a molar ratio of 1:3 in an appropriate amount of ethanol (the mass ratio of ethanol: ethylcellulose and NaOH mixture is 15:1) to prepare a sol;

[0038] 2) aging the prepared sol at room temperature for 12 hours to obtain a gel;

[0039] 3) drying the obtained gel at 60°C for 6 hours to obtain a xerogel;

[0040] 4) The dry gel is carbonized with argon as a protective gas and kept at 700°C for 3 hours;

[0041] 5) The carbonized product was washed with deionized water until the pH of the solution was 7.0, and the solution was suction-filtered to obtain the product, which was dried at 60° C. for 5 hours to obtain three-dimensional graphene.

Embodiment 3

[0043] A kind of method that adopts ethyl cellulose to prepare three-dimensional graphene as raw material, comprises the following steps:

[0044] 1) Dissolve analytically pure ethylcellulose and NaOH in a molar ratio of 1:2 in an appropriate amount (the mass ratio of ethanol: ethylcellulose and NaOH mixture is 20:1) to prepare a sol;

[0045] 2) aging the prepared sol at room temperature for 12 hours to obtain a gel;

[0046] 3) drying the obtained gel at 60°C for 6 hours to obtain a xerogel;

[0047] 4) The dry gel is carbonized with argon as a protective gas and kept at 900°C for 3 hours;

[0048] 5) The carbonized product was washed with deionized water until the pH of the solution was 7.0, and the solution was suction-filtered to obtain the product, which was dried at 60° C. for 5 hours to obtain three-dimensional graphene.

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Abstract

The invention discloses a method for preparing three-dimensional graphene by adopting ethyl cellulose as the raw material. The method comprises the steps that analytically pure ethyl cellulose and NaOH are dissolved in ethyl alcohol according to the molar ratio of 1 to 1-3 to form sol, aging is conducted on the obtained sol for 12 h to obtain gel, and the gel is dried at 80 DEG C for 6 h to obtain dried gel; carbonization is conducted on the obtained dried gel in an argon atmosphere at the temperature ranging from 700 DEG C to 1000 DEG C, a carbonized product is washed through deionized water till PH of a solution ranges from 6.8 to 7.2, suction filtration is conducted on the solution, a product is obtained, the product is dried for 5 h at 60 DEG C, and the product three-dimensional graphene is obtained. The method for preparing the three-dimensional graphene takes the ethyl cellulose as the raw material, the three-dimensional graphene is prepared by adopting a sol-gel method, the raw material of the reaction is easy to obtain, the cost is low, process equipment is simple, and energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing three-dimensional graphene. Background technique [0002] Graphene is carbon atoms with sp 2 The flake structure formed by hybridization has attracted people's attention since its discovery because of its large specific surface area, good electrical conductivity, good physical and chemical stability, high light transmittance and high mechanical strength. [0003] However, there is a strong van der Waals force between graphene sheets, which makes it easy to superimpose between sheets, and its specific surface area decreases, which limits its performance. Three-dimensional graphene is caused by the self-assembly of graphene. It not only has a large specific surface area of ​​graphene, but also has an electrical conductivity comparable to graphene, making it have great application prospects in the fields of energy storage technology and catalysis. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01P2002/30C01P2002/82C01P2004/03C01P2004/30
Inventor 殷立雄张浩刘长青黄剑锋张东东柴思敏李嘉胤孔新刚
Owner SHAANXI UNIV OF SCI & TECH
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