Electrochemical methods for producing single or double layer graphene sheets

摘要

There is provided a method of producing a graphene sheet isolated from layered graphite comprising the steps of: (a) forming a graphitic compound intercalated with an alkali metal ion by electrochemical intercalation; A layered graphite material is used as the positive electrode material and a metal or graphite is used as the negative electrode material and a current is flowed into the interlayer spacing of the alkali metal ions by using a liquid solution of the alkali metal salt dissolved in the organic solvent as both of the interlayer insulator supply sources, To a cathode and an anode at a sufficient current density for a period of time sufficient to effect electrochemical intercalation of the electrolyte; And (b) forming a hexagonal carbon atom intermediate layer (graft) from the graphite compound intercalated with alkali metal ions using ultrasonic treatment, thermal shock exposure, exposure to aqueous solution, mechanical shearing treatment or a combination thereof to produce isolated graphene sheets Pin plane).