Method for producing graphene in green and large-scale manner

Abstract

The invention relates to a method for producing graphene in a green and large-scale manner. The method comprises the following steps of: (1) preparing 0.1-10M of electrolytic solution; (2) adding an anode material into an electrolytic tank containing the electrolytic solution, fixing by using foam paper, and fixing a cathode material at the middle of the foam paper; (3) inserting a thin pipe connected with insert gas into the electrolytic solution, and fixing on the foam paper; (4) adding cooling equipment at the periphery of the electrolytic solution to maintain the temperature of the electrolytic solution to 5-15 DEG C; (5) respectively connecting a positive electrode and a negative electrode of a direct-current power supply to the anode material and the cathode material in the electrolytic tank; (6) introducing the inert gas for protection at the anode material, turning on the power supply, simultaneously adjusting the voltage of the power supply to 8-20V, and starting electrochemical intercalation and peeling; (7) carrying out suction filtration and washing on intercalation graphene flakes after electrochemical intercalation, peeling and dropping, and after electrolyte ions arewashed off, carrying out ultrasonic treatment and centrifugation in a solvent to obtain graphene dispersing solution; and (8) carrying out vacuum filtration on the graphene dispersing solution, freezing and drying to obtain the graphene. The method is extremely low in cost and simple and environmental-friendly in process.

Description

Technical field [0001] The invention relates to the field of graphene production, in particular to a method for green-scale production of graphene. Background technique [0002] Graphene is a new type of ultra-high performance two-dimensional material developed in the past ten years. It consists of carbon atoms through sp 2 A single-layer honeycomb two-dimensional grid structure composed of hybrids. The thickness of graphene is only 0.334 nm, which is the thinnest material known in the world. It is also the basic unit of graphite. It can be self-wrapped to form zero-dimensional fullerene, or it can be self-packed and rolled into one-dimensional carbon nanometers. Tubes and layers are stacked to form three-dimensional graphite (Allen MJ, Tung VC, KanerR B. Honeycomb carbon: A review of graphene[J]. Chemical Reviews, 2010, 110(1): 132-145. ). Due to this special structure, graphene has many special excellent properties. Its theoretical specific surface area is as high as 2630 m 2...

AI Technical Summary

Problems solved by technology

Cutting carbon nanotubes has created a new method for the preparation of high-performance graphene, but there is still a long way to go for large-scale and low-cost cutting of carbon nanotubes to prepare graphene

[0008] In addition, the reduction of graphite oxide method can realize large-scale production of graphene, but there are a large number of oxidation defects in the prepared graphene, which seriously destroys the complete structure of graphene, thereby limiting its excellent performance, especially electrical properties, while reducing oxidation Graphene needs to use hydrazine hydrate, HI and other chemicals harmful to the environment, which is not conducive to environmental protection

[0009] To sum up, the existing preparation methods cannot achieve green large-scale preparation of high-quality graphene, which seriously limits the industrial application of graphene.

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