▎ 摘　　要

NOVELTY - Device comprises reaction vessel (1), an expandable graphite cake (2), a conductive metal mesh (3), a conductive metal plate (4), a weak acid electrolyte (5) and a power supply (6). The conductive metal plate is mounted on the top of the reaction vessel, the reaction vessel is filled with weak acid electrolyte, and the expandable graphite cake is placed at the bottom of the reaction vessel. The outer surface of the expandable graphite cake is welded with a conductive metal mesh, and the power supply is connected to the conductive metal mesh and conductive metal plate through wires. USE - Device for preparing graphene (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene, which involves embedding an expandable graphite cake on the bottom of the reaction vessel, decomposing weak acid above reaction vessel, connecting the power supply to conductive metal plate and conductive metal plate through wire, respectively, switching the conductive metal plate to perform electrolysis of the expandable graphite cake, performing full electrolysis, cleaning the mixture of graphene and electrolyte, subjecting to ultrasonic crushing and filtration, and then drying to obtain required graphene. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the device for preparing graphene. Reaction vessel (1) Expandable graphite cake (2) Conductive metal mesh (3) Conductive metal plate (4) Weak acid electrolyte (5) Power supply (6)