Preparation method of graphene

Abstract

The invention discloses a preparation method of graphene. The method comprises the following technological steps of: acquiring at least one pair of graphite rods, an electrolyte and a power supply; inserting the graphite rod pair into the electrolyte, connecting one of the graphite rods with a positive electrode of the power supply, and connecting the other graphite rod with a negative electrode of the power supply, then switching on a power switch for electrolysis; collecting an electrolytic product adhered on the surfaces of the graphite rods, mixing the electrolytic product with the electrolyte, conducting centrifugation, removing an agglomerated graphene sediment, and collecting a suspension; filtering, washing and drying the suspension so as to obtain a graphene-containing solid; roasting he solid in an oxygen-free environment, thus obtaining the graphene. With low requirement for equipment, simple production technology, and strong operability, the method of the invention is suitable for industrial production, and improves graphene productivity. Being economic and environment-friendly, the method provided in the invention can finally generate a graphene product of high purity.

Description

technical field [0001] The invention belongs to the technical field of new carbon materials, and in particular relates to a graphene preparation method. Background technique [0002] Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004. Due to its unique structure and optoelectronic properties, it has attracted extensive attention. Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. In particular, its high conductivity, large specific surface properties and its two-dimensional nanoscale structural properties of monomolecular layers can be widely used in electrode materials. It can be applied as an electrode material in supercapacitors and lithium-ion batteries. [0003] So far, there are many methods known to prepare graphene, such as: (1) micro-mechanical exfoliation method...

AI Technical Summary

Problems solved by technology

[0003] So far, there are many methods known to prepare graphene, such as: (1) micromechanical exfoliation method, which can only produce a very limited number of graphene sheets, which can be used as basic research; (2) ultra-high Vacuum graphene epitaxial growth method, the high cost of this method and the structure of small discs limit its application; (3) oxidation-reduction method, the whole process involves the oxidation of graphite into graphite oxide, and the graphene produced by graphite oxide exfoliation oxide, and then chemically or thermally reduced to graphene, the graphene synthesized by this method is more prone to defects; (4) chemical vapor deposition (CVD), this method can meet the requirements of large-scale preparation of high-quality graphene, but The cost is higher and the process is complicated; (5) solvent stripping method, the disadvantage of this method is that the yield is very low, which limits its commercial application; (6) electrolysis method, this method can synthesize a large amount of graphene, but the synthesized graphene The surface has a large number of positive ions or negative ions or organic matter

It can be seen that none of the above methods can synthesize a large amount of high-purity graphene.

Images