Method for continuously preparing graphene

Abstract

The invention discloses a method for continuously preparing graphene and belongs to the technical field of preparation of the graphene. The method for continuously preparing the graphene comprises thesteps: a graphite electrode serves as a sacrificial anode, a sheet metal or graphite electrode serves as a cathode, the sacrificial anode and the cathode are placed into an electrolyte of an oblique-placed electrolysis tank, and a DC regulated power supply is applied for electrochemical reaction stripping so as to form the graphene; during electrochemical reaction, the graphene containing electrolyte flows in a solid-liquid separator located below the electrolysis tank under the action of own gravity and is subjected to solid-liquid separation so as to obtain the graphene and the electrolyte;and the separated electrolyte is recycled and flows back into the electrolysis tank for the electrochemical reaction through being driven by a peristaltic pump. According to the method, the effect ofrapidly recycling the electrolyte is achieved by adopting a liquid flow recycling technology, the continuous production of the graphene is achieved, the continuous stripping production cycle is short, the product structure is excellent, and thus, the method is applicable to large-batch rapid continuous production. Meanwhile, no waste gas is generated, no strong acid is used, the electrolyte can be recycled and reused, and thus, the method has an obvious environment-friendly value.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for rapidly and continuously preparing graphene by an electrochemical method. Background technique [0002] Graphene is another major discovery in the field of carbon materials after porous carbon, carbon fiber, fullerene and carbon nanotubes. It is a completely sp 2 A quasi-two-dimensional nanomaterial with a thickness of only a single atomic layer or several single atomic layers composed of hybridized carbon atoms. Graphene is not only the thinnest material, but also the strongest material. It also has good elasticity. The stretching range can reach 20% of its own size. It has high light transmission and conductivity, high specific surface area, high strength and Excellent properties such as flexibility have been widely used in high-performance energy storage, electronic devices, optoelectronic devices, gas sensors, composite materials and other fields. ...

AI Technical Summary

Problems solved by technology

[0004] Usually, the intercalation solution contains one or two kinds of strong oxidizing acids, and there are two main problems in this process: ① strong acid waste liquid is difficult to treat and reuse; ② a large amount of waste gas is generated during the stripping process

These all involve environmental pollution issues and have a great impact on the environment.

However, secondary treatment of waste and waste liquid requires expensive equipment and complicated processes.

In addition, the thickness of the graphite flakes produced by the intercalation-exfoliation method in the prior art is not uniform enough, and the thickness of many flakes is greater than 1 μm. However, in practical applications, graphene is required to be as thin as possible, such as lithium battery materials, supercapacitor electrode materials, Transparent conductive materials, etc.

Epitaxial crystal growth, chemical vapor deposition and other methods are expensive and have low output, which limits the mass production and application of graphene

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