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Preparation method for three-dimensional graphene

A graphene, three-dimensional technology, applied in the field of preparation of self-supporting three-dimensional graphene, can solve problems such as inability to increase production, waste of ammonium chloride, poor self-foaming effect of glucose, etc., to achieve improved electrical transmission performance, good effect, and process simple effect

Inactive Publication Date: 2015-12-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the effect of ammonium chloride is only on foaming, which cannot increase the output, so it will cause waste of ammonium chloride. At the same time, the self-foaming effect of glucose is not good, and without doping, the electrical transmission performance is not as good as that of doped graphene.

Method used

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  • Preparation method for three-dimensional graphene
  • Preparation method for three-dimensional graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Three-dimensional graphene is prepared by using tryptophan as a precursor. The first step is to weigh a certain amount of tryptophan, and the second step is to raise the temperature to a specified temperature and keep it for a certain period of time to prepare a self-supporting three-dimensional graphene foam.

[0020] Step 1, weigh tryptophan and place it in the furnace body;

[0021] Step 2. Under an inert atmosphere, raise the temperature of the reaction system to 1000°C at 4°C / min, and keep it warm for 0.5h;

[0022] Step 3, the reaction furnace is cooled to room temperature, and after the reaction is completed, the sample is taken out.

[0023] Optical and SEM characterization of the samples as figure 1 , 2 shown. The results show that, according to the process parameters of Example 1, the three-dimensional graphene with larger pores connected to each other, better light transmission, and self-supported by the carbon skeleton can be obtained.

Embodiment 2

[0025] Three-dimensional graphene is prepared by using tryptophan as a precursor. The first step is to weigh a certain amount of tryptophan, and the second step is to raise the temperature to a specified temperature and keep it for a certain period of time to prepare a self-supporting three-dimensional graphene foam.

[0026] Step 1, weigh tryptophan and place it in the furnace body;

[0027] Step 2. Under an inert atmosphere, raise the temperature of the reaction system to 1200°C at a rate of 6°C / min, and keep it warm for 2 hours;

[0028] Step 3, the reaction furnace is cooled to room temperature, and after the reaction is completed, the sample is taken out.

[0029] Carry out SEM, EDS characterization to sample with example 1.

Embodiment 3

[0031] Three-dimensional graphene is prepared by using tryptophan as a precursor. The first step is to weigh a certain amount of tryptophan, and the second step is to raise the temperature to a specified temperature and keep it for a certain period of time to prepare a self-supporting three-dimensional graphene foam.

[0032] Step 1, weigh tryptophan and place it in the furnace body;

[0033] Step 2. Under an inert atmosphere, raise the temperature of the reaction system to 1400°C at a rate of 10°C / min, and keep it warm for 5 hours;

[0034] Step 3, the reaction furnace is cooled to room temperature, and after the reaction is completed, the sample is taken out.

[0035] Carry out SEM, EDS characterization to sample with example 1.

[0036] In the present invention, tryptophan is used as a carbon source, and graphene is prepared by self-foaming at a high temperature, without a practical foaming agent and the foaming effect is better; since the precursor contains organic nitrog...

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Abstract

The invention discloses a preparation method for three-dimensional graphene. The method comprises the following steps: with tryptophan as a carbon source, carrying out heating to a specified temperature and carrying out heat preservation for a certain time under the protection of inert gas so as to prepare freestanding three-dimensional graphene. The preparation method for the three-dimensional graphene provided by the invention uses the tryptophan as the carbon source and introduces nitrogen-atom-doped graphene, so electricity transmission performance is significantly improved; meanwhile, the preparation method does not need assist of other foaming agents and has better self-foaming effects, so the process is simple.

Description

technical field [0001] The invention belongs to the field of nanometer material preparation, in particular to a method for preparing self-supporting three-dimensional graphene applicable to lithium ion batteries and supercapacitors. Background technique [0002] Graphene is a new material with a monolithic layer structure composed of carbon atoms. It is a layered hexagonal honeycomb structure planar film composed of carbon atoms in sp2 hybrid orbitals, with a thickness of only one carbon atom. [0003] Graphene has superior electrical conductivity and a large specific surface area; the three-dimensional graphene derived from it inherits the advantages of graphene and obtains a large surface area through a three-dimensional structure. It is widely used in lithium batteries, supercapacitors and catalysis. Wide application prospects. [0004] The preparation methods of three-dimensional graphene mainly include the method based on reduced graphene oxide GO, metal template growt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 曾海波吉建平严仲宋秀峰
Owner NANJING UNIV OF SCI & TECH
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