Graphene and preparation method thereof

Abstract

The present invention relates to graphene and a preparation method thereof. The preparation method comprises: adopting a graphite rod as a positive electrode, adopting a platinum rod as a negative electrode, and connecting into an external power supply; inserting the positive electrode and the negative electrode into an electrolyte solution, applying a voltage of 0.8-1.5 V, maintaining for 1-5 min, stopping, applying a voltage of 10-15 V, maintaining for 4-15 min, and filtering and drying the electrolyte solution; and placing the dried solid product in an inert gas atmosphere, and adopting laser with a frequency of 4*10<14>-7.5*10<14> HZ to irradiate to obtain the graphene. According to the present invention, the electrochemical intercalation method and the laser stripping method are adopted to efficiently convert graphite into graphene, such that the prepared graphene has extremely high specific surface area so as to improve the energy storage property and the like of the graphene; and the equipment and the process required during the preparation process are simple and are easy to operate, the raw materials are cheap, the cost is low, and large-scale industrial production is easily achieved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a graphene and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional monolayer material with excellent physical properties, such as high theoretical specific surface area, excellent mechanical strength, good flexibility and high electrical conductivity, etc., so it has received extensive attention from researchers. . At present, the methods for preparing graphene mainly include mechanical exfoliation method, epitaxial growth method, redox method and chemical vapor deposition method, while the amount of graphene prepared by mechanical exfoliation method and epitaxial growth method is relatively low, and the thickness is not uniform; redox method It is mainly divided into oxidative thermal reduction and oxidative chemical reduction. The preparation of graphene by oxidation thermal reduction often requires higher temperature and consumes a lot of ...

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Problems solved by technology

At present, the methods for preparing graphene mainly include mechanical exfoliation method, epitaxial growth method, redox method and chemical vapor deposition method, and the amount of graphene prepared by mechanical exfoliation method and epitaxial growth method is low, and the thickness is not uniform; redox method It is mainly divided into oxidative thermal reduction and oxidative chemical reduction. The preparation of graphene by oxidative thermal reduction often requires higher temperature and consumes a lot of energy, while the preparation of graphene by chemical reduction often uses chemical reagents such as hydrazine. These reagents have certain toxicity. Harmful to the human body and the environment; graphene is prepared by chemical vapor deposition, which requires high production equipment

[0003] The theoretical specific surface area of ​​graphene is relatively high, which can reach 2630m 2 / g, but in fact the specific surface area is relatively low, basically at 500m 2 Below / g, this limits many properties of graphene, such as energy storage performance, etc.

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