▎ 摘　　要

NOVELTY - The present invention is directed to an electrochemical method for preparing defective graphene to solve the problems of pollution and diminishing the properties of the produced graphene in the convention method that used surfactant as electrolytic solution. The method of the present invention comprises: putting an anode and a cathode into an electrolytic solution, wherein the electrolytic solution is a phosphate buffer solution; and applying an ultrasonic to the electrolytic solution, applying a positive bias to the anode and the cathode to allow defective graphene to exfoliate from the anode.