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Method for preparing nitrogen self-doped three-dimensional graphene from peels

A self-doping and graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as nitrogen self-doping three-dimensional graphene, etc., to meet sustainable development, reduce costs and prices. low cost effect

Inactive Publication Date: 2016-07-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the preparation of nitrogen self-doped three-dimensional graphene by using fruit peels.

Method used

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  • Method for preparing nitrogen self-doped three-dimensional graphene from peels
  • Method for preparing nitrogen self-doped three-dimensional graphene from peels
  • Method for preparing nitrogen self-doped three-dimensional graphene from peels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Wash the banana peel and cut into pieces, add water, and react with hydrothermal insulation at 180°C for 12 hours. Rinse the product repeatedly with water and filter to obtain a black gel-like carbide;

[0042] 2) Freeze-drying the gelatinous carbide in step 1) at -60°C and an absolute pressure of 20 Pa for 24 hours to obtain a preliminary carbonized product;

[0043] 3) Mix the preliminary carbonized product in step 2) with the KOH solid in a mass ratio of 1:2 and put it into a ball mill tank, add ethanol to the 3 / 4 position of the ball mill tank, and ball mill on a ball mill at a rate of 500 rpm for 5 hours;

[0044] 4) Dry the ball milled product in step 3) at 120°C until the ethanol is completely volatilized, and then under the protection of Ar gas at 5°C for min -1 The rate of heating up to 800 ℃ for 1h for high temperature activation;

[0045] 5) Put the product obtained in step 4) in 0.5mol.L -1 The unreacted activator and other impurities were removed by acid washing...

Embodiment 2

[0055] 1) Wash the orange peel and cut into pieces, add water, and react with hydrothermal insulation at 180°C for 18h. Rinse the product repeatedly with water and filter to obtain a black gel-like carbide;

[0056] 2) Freeze-dry the gelatinous carbide in step 1) at 0°C and an absolute pressure of 10 Pa for 48 hours to obtain a preliminary carbonized product;

[0057] 3) Combine the preliminary carbonized product in step 2) with K 2 CO 3 The solids are mixed according to the mass ratio of 1:1 and put into the ball milling tank, adding ethanol to the 3 / 4 position of the ball milling tank, and ball milling on the ball mill at a rate of 500 rpm for 5 hours;

[0058] 4) Dry the ball milled product in step 3) at 100°C until the ethanol is completely volatilized, and then under the protection of Ar gas at 5°C for min -1 The rate is increased to 600℃ for 1h for high temperature activation;

[0059] 5) Put the product obtained in step 4) in 0.1mol.L -1 The unreacted activator and other impuri...

Embodiment 3

[0065] 1) Wash the banana peel and cut into pieces, add water, and react under hydrothermal insulation at 190°C for 14 hours. Rinse the product repeatedly with water and filter to obtain a black gel-like carbide;

[0066] 2) Freeze-drying the gelatinous carbide in step 1) at -50°C and an absolute pressure of 50 Pa for 12 hours to obtain a preliminary carbonized product;

[0067] 3) Mix the preliminary carbonized product in step 2) with the NaOH solid in a mass ratio of 1:3 and put it into a ball mill tank, add ethanol to the 3 / 4 position of the ball mill tank, and ball mill on a ball mill at a rate of 500 rpm for 6 hours;

[0068] 4) Dry the ball milled product in step 3) at 120°C until the ethanol is completely volatilized, and then under the protection of Ar gas at 6°C for min -1 The rate of heating is increased to 700°C for 2h for high temperature activation;

[0069] 5) Put the product obtained in step 4) in 0.2mol.L -1 Pickling in sulfuric acid solution at 30°C for 10 hours to re...

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Abstract

The invention relates to a method for preparing nitrogen self-doped three-dimensional graphene from peels. With peels as a carbon source and a nitrogen source, the method comprises the following steps: performing hydrothermal carbonization; performing activation treatment using an activator; and performing acid washing and drying to obtain the nitrogen self-doped three-dimensional graphene. In the invention, since the peels are selected as a raw material for preparing the nitrogen self-doped three-dimensional graphene, the needs for sustainable development and environmental protection can be met, and the raw material cost is effectively reduced. The specific surface area of the prepared product exceeds 1700m<2>g<-1>; the relatively large specific surface area and three-dimensional graphene porous structure are beneficial to the transfer and transport of ions in the electrolyte; and the electrical conductivity is very good. Due to the doping of nitrogen element, active sites for catalysis and lithium storage reactions can be formed, and the nitrogen self-doped three-dimensional graphene can be widely applied to the fields of energy storage and transformation such as fuel cells and lithium ion batteries. Moreover, the graphene material has excellent electrical conductivity, and the carbon material has relatively high activity due to the doping of nitrogen element.

Description

Technical field [0001] The invention relates to a method for preparing nitrogen self-doped three-dimensional graphene by using peels, and belongs to the field of graphene material preparation. Background technique [0002] Graphene is a two-dimensional material with carbon atoms composed of sp2 hybrid orbitals in a hexagonal shape and only one carbon atom thick. Compared with other carbon materials, graphene has better conductivity, larger specific surface area, and more High Young's modulus and thermal conductivity; unique structure and a series of outstanding properties make it one of the frontiers of material science research today, and has a wide range of application prospects in the fields of catalysis, electronics, biology and energy storage; Recently, it was discovered that the assembly of two-dimensional graphene sheets into a three-dimensional structure material can effectively prevent the agglomeration of graphene sheets. This three-dimensional structure of graphene can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/32C01P2002/82C01P2002/85C01P2004/03C01P2004/04C01P2006/16C01P2006/17
Inventor 木士春张晨雨周煌张建
Owner WUHAN UNIV OF TECH
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