Method for preparing high-quality graphene through electrochemical reduction

Abstract

Provided is a method for preparing high-quality graphene through electrochemical reduction. The method comprises the following steps that firstly, graphite oxide is added into deionized water, and a graphene oxide solution is obtained after ultrasonic exfoliation; and sulfuric acid is added to the graphene oxide solution, the new solution is subjected to electro-reduction for 10 min to 2 hours with the voltage being 1.5 V, then suction filtration is carried out, washing with water is carried out, and thus the graphene is obtained. The method has various advantages of being simple in process, high in repeatability and yield, easy to control and the like. More importantly, the method saves energy and causes no pollution to the environment.

Description

technical field [0001] The invention relates to the field of graphene preparation, in particular to a method for preparing high-quality graphene through electrochemical reduction. Background technique [0002] In 2004, Geim and Novoselov of the University of Manchester discovered graphene composed of a single layer of carbon atoms. Since then, graphene has attracted much attention as a new type of carbon material. Graphene is made of sp 2 A two-dimensional crystal composed of hybrid single-layer carbon atoms in a regular hexagon is the basic unit of allotropic carbon such as carbon nanotubes, fullerenes, and graphite. According to theoretical predictions, the electron migration rate of graphene reaches 200,000 cm 2 / V·s, the specific surface area reaches 2630m 2 / g, the thermal conductivity reaches 5000W / m·K, the Young's modulus reaches 1TPa, and the single-layer light transmittance is about 97.7%. With its unique electronic, mechanical, and optical properties, graphene ...

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Problems solved by technology

Among these methods, the micromechanical exfoliation method uses micromechanical stress to overcome the Van der Waals force, which has the advantages of low defect and high electron mobility, but its cost is high and the yield is low, so it is only suitable for basic research; the thickness of graphene obtained by the epitaxial growth method Uneven, high cost and complicated process, so its application is limited; chemical reduction method generally uses strong reducing agent such as hydrazine hydrate, although its cost is low, but hydrazine hydrate is highly toxic and difficult to remove, which will cause personal injury, environmental pollution and Equipment damage

The thermal reduction method can effectively reduce graphene oxide by rapidly heating graphene oxide to 1100°C in an inert gas, but this method requires high temperature conditions, high requirements on equipment and environment, and high energy consumption; photocatalytic reduction method That is to reduce graphene oxide by ultraviolet light irradiation, but long-term irradiation of ultraviolet light is harmful to the human body, and consumes a lot of energy, and the reduction yield is low, which will limit its performance and application

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