Graphene, graphene colloidal sol, graphene powder and preparation method and preparation device

A graphene powder and graphene technology, applied in the field of graphene, can solve the problems that restrict the development of graphene application, harsh reaction conditions, environmental pollution, etc., and achieve the goal of suitable process amplification and promotion, mild process conditions, and no pollutant emissions Effect

Inactive Publication Date: 2015-09-23
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most likely macro-preparation of graphene is the redox method. The reaction conditions are harsh, high temperature and high pressure are required, and the requirements for material corrosion and equipment are extremely high. The use of strong acids and strong oxidants in the preparation process will cause serious environmental pollution. The graphene dispersion system is widely used. Organic solvents are difficult to remove, these problems seriously restrict the application and development of graphene

Method used

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  • Graphene, graphene colloidal sol, graphene powder and preparation method and preparation device
  • Graphene, graphene colloidal sol, graphene powder and preparation method and preparation device
  • Graphene, graphene colloidal sol, graphene powder and preparation method and preparation device

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Embodiment 1

[0071] A preparation method for graphene hydrosol, comprising the steps of:

[0072] (1) Electrochemical intercalation and exfoliation of graphite:

[0073] Both the reaction electrode and the counter electrode are flexible graphite paper, with a size of 4cm×6cm×0.05cm; connected to an external DC power supply of 5V, the current is 0.5A; the electrolyte is 900mL of 0.1mol / L sodium sulfate solution, and add 3. 9725g of L-glutamic acid to make the concentration 0.03mol / L; control the reaction temperature to 15°C, perform electrochemical stripping for 3 hours, and obtain graphene dispersed in the electrolyte;

[0074] (2) Remove inorganic salts and amino acids: the graphene dispersed in the electrolyte obtained in step (1) is suction filtered, and the excess electrolyte is washed away with deionized water; then centrifuged at 2000rpm for 10min to remove unintercalated or insufficiently intercalated Graphite microflakes; finally add deionized water and ultrasonic treatment for 2 ...

Embodiment 2

[0086] A preparation method for graphene hydrosol, comprising the steps of:

[0087] (1) Electrochemical intercalation and exfoliation of graphite:

[0088] Both the reaction electrode and the counter electrode are flexible graphite paper, with a size of 4cm×6cm×0.05cm; connected to an external DC power supply of 5V, the current is 0.5A; the electrolyte is 900mL of 0.2mol / L ammonium nitrate solution, and added 7. 4334g of phenylalanine to make the concentration 0.05mol / L; control the reaction temperature to 10°C, perform electrochemistry for 3 hours, and obtain graphene dispersed in the electrolyte;

[0089] (2) Remove inorganic salts and amino acids: the graphene dispersed in the electrolyte obtained in step (1) is suction filtered, and the excess electrolyte is washed away with deionized water; then centrifuged at 2000rpm for 10min to remove unintercalated or insufficiently intercalated Graphite microflakes; finally ultrasonic treatment for 2 hours to prepare a graphene hyd...

Embodiment 3

[0094] A kind of preparation method of graphene hydrosol, the difference with embodiment 1 is:

[0095] In the electrolytic cell of electrochemical intercalation, a 50mT magnetic field is applied; wherein the graphene sol system prepared by step (2) is denoted as sol ④, and wherein the concentration of graphene is 1.5mg / mL;

[0096] The product yield of the present embodiment improves 15% compared with embodiment 1;

[0097] Performance Testing:

[0098] The graphene C / O ratio is 11.59; the mass fraction of graphene carbon is 91.6%.

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Abstract

The invention provides graphene, graphene hydrosol, and graphene powder obtained by drying the graphene hydrosol, wherein the edge of the graphene comprises active groups, and the active groups comprise amino groups. The preparation method of the graphene hydrosol comprises the following steps: (1), performing electrochemical intercalation and exfoliation on graphene to obtain graphene dispersed in electrolyte; the electrolyte after electrochemical intercalation and exfoliation contains both inorganic salt and amino acid; after intercalation, removing free inorganic salt and amino acid compounds from the solution to obtain the graphene hydrosol. According to the graphene, graphene colloidal sol, graphene powder and the preparation method and the preparation device, provided by the invention, the graphene hydrosol is provided, the use of a great deal of an organic solvent in the graphene hydrosol based on the organic solvent is reduced, the stability is good, the preparation method is simple, the operation is easy, the equipment and material requirements are low, the environmental friendliness is achieved, and the industrialization is facilitated.

Description

technical field [0001] The invention belongs to the field of graphene, in particular to a graphene sol and a preparation method thereof. Background technique [0002] Graphene has been regarded as a new material capable of changing the world as soon as it came out. The single atomic layer nanostructure endows it with super unique properties, including electrical, optical, chemical and other excellent properties. With the continuous deepening of graphene research, the research direction has developed from the initial research on the intrinsic properties of graphene to the research on graphene preparation methods to the continuous innovation of graphene application fields. The two major challenges facing the industrial application of graphene are the process of mass production and the guarantee of high-quality graphene. At present, it is most likely that the oxidation-reduction method for macro-preparation of graphene requires harsh reaction conditions, high temperature and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 王钰赵增华陈运法尤伟任缪小林顾孙望
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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