▎ 摘　　要

NOVELTY - A graphene sheet is prepared by dissolving graphite oxide in deionized water to obtain of 0.1-4 mg/ml graphene oxide solution, placing into reaction container, inserting both ends of electrode into reaction container having distance of 1-5 cm, connecting signal generator into electrode, applying positive and negative pulse voltage to electrode through signal generator having pulse voltage regulator size of 1-20 V, frequency of 50-100 Hz, duty ratio of 55-90%, and pulse voltage action time of 30-240 minutes, and performing electrochemical reaction in graphene oxide. USE - Preparation of graphene sheet for flexible electrode material (claimed). ADVANTAGE - Preparation process is simple and environment-friendly and has simple device and low raw material cost, and product has excellent electrochemical property and high conductivity. DETAILED DESCRIPTION - A graphene sheet is prepared by dissolving graphite oxide in deionized water to obtain of 0.1-4 mg/ml graphene oxide solution, placing into reaction container, inserting both ends of electrode into reaction container having distance of 1-5 cm, connecting signal generator into electrode, applying positive and negative pulse voltage to electrode through signal generator having pulse voltage regulator size of 1-20 V, frequency of 50-100 Hz, duty ratio of 55-90%, and pulse voltage action time of 30-240 minutes, performing electrochemical reaction in graphene oxide having alternating electric field, forming graphene thin film in electrode surface, heating electrode, and peeling off. DESCRIPTION OF DRAWING(S) - The drawing shows a scanning electron microscope image of graphene sheet.