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Method for preparing three-dimensional graphene by template method

A technology of graphene and template method, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of expensive three-dimensional porous nitrogen-doped graphene, and achieve the effect of increasing the usable loading area and simple method

Active Publication Date: 2017-03-29
姚泰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the technical problem that the three-dimensional porous nitrogen-doped graphene prepared by the existing method is relatively expensive, and provides a method for preparing three-dimensional graphene by template method

Method used

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  • Method for preparing three-dimensional graphene by template method
  • Method for preparing three-dimensional graphene by template method
  • Method for preparing three-dimensional graphene by template method

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Experimental program
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specific Embodiment approach 1

[0023] Specific embodiment one: the preparation method of three-dimensional graphene of the present embodiment is to carry out according to the following steps:

[0024] 1. Ultrasonic disperse 5-500mg graphene oxide and 2.5-50g melamine or dicyandiamide into 0.2-2L solvent to obtain a dispersion;

[0025] 2. Add 0.05-1L of dilute nitric acid, dilute sulfuric acid or phosphoric acid with a concentration of 0.1-2mol / L to the dispersion obtained in step 1 to obtain a precipitate;

[0026] 3. Suction filter the precipitate and wash it with absolute ethanol for 3 times, redisperse the product obtained by suction filtration into molds of different shapes with ethanol, and dry at 70°C for 10 hours to obtain the precursor;

[0027] 4. Raise the precursor obtained in step 3 to 300-400°C at a rate of 1-2°C / min under the condition of argon or nitrogen and keep it warm for 2 hours, and then increase the temperature at a rate of 1-5°C / min Heat it up to 750-900°C and keep it warm for 2 hou...

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment is different from Embodiment 1 in that the solvent described in step 1 is ethylene glycol, water or ethanol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that in step 1, 200 mg of graphene oxide and 30 g of melamine or dicyandiamide are ultrasonically dispersed into 1 L of solvent. Others are the same as those in the first or second embodiment.

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Abstract

The invention provides a method for preparing three-dimensional graphene by a template method, and relates to a method for preparing the three-dimensional graphene by the template method. The method aims at solving the technical problems of high cost and complicated operation of the preparation of the three-dimensional nitrogen-doping graphene. The method comprises the following steps of 1, preparing a dispersion solution; 2, adding dilute nitric acid, dilute sulphuric acid or phosphoric acid into the dispersion solution obtained in the step 1 to obtain precipitates; 3, dispersing products obtained through suction filtration into molds in different shapes again by ethyl alcohol; performing drying; obtaining precursors; 4, performing temperature rising on the precursors under the argon or nitrogen condition; performing heat insulation; then performing temperature rising and heat insulation again; thereby obtaining the three-dimensional graphene. The method has the advantages that the cheap melamine or dicyandiamide is used as raw materials; the prepared three-dimensional graphene is about 10 Yuan / g; the price is much lower than the price of the existing market sold graphene (the market selling price of the graphene at present is about 100 to 1000 Yuan / g); the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing three-dimensional graphene. Background technique [0002] Graphene material is a single atomic layer material with a unique two-dimensional honeycomb structure, which is the basic structural unit of fullerene, carbon nanotube and graphite. Graphene has excellent electrical, thermal and mechanical properties, and can be widely used in the fields of energy, environment and biology, and the application of graphene can be further expanded by doping heteroatoms (such as N, S, P, etc.). However, since graphene sheets are easy to agglomerate to form a two-dimensional structure material with low porosity, in order to further develop the potential of graphene-based materials, three-dimensional porous nitrogen-doped graphene has attracted more and more attention. (Cao, et al. small., 2011, 7, 3163; Hu, et al. Adv. Mater., 2013, 25, 2219). Three-dimensional porous nitrogen-doped graphene has many other excellent p...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B2204/20C01B2204/22C01P2004/03C01P2004/30
Inventor 宋波李加杰张宇民姚泰韩杰才
Owner 姚泰