▎ 摘　　要

NOVELTY - One-pot (an electrochemical cell) and two steps electrochemical method for synthesizing graphene oxide (GO) and graphene oxide-metal composites including GO/copper, GO/iron, GO/cesium and GO/lanthanum, in the first step (a) the cell comprises the graphite electrode as both working as well as counter electrode, an electrolyte solution consisting of pure acids and a mixture of acids for anodic exfoliation of graphite, current density of 0.0625-0.625 A/cm2, distance between electrodes of 0.5-3 cm, and time of 1-30 minutes, at the end of step one, both working as well as counter electrode are replaced by dimensionally stable electrodes (DSE), the slurry comprising of exfoliated graphene sheets and the electrolytic solution remains in the electrochemical cell, and in the second step (b), the cell comprises the electrodes comprising DSE as both working as well as counter electrode. USE - The method is useful for synthesizing graphene oxide and graphene oxide-metal composites. ADVANTAGE - The method: is one-pot and two steps method, no pollution and simple operation; provides highly oxidized graphene sheets in lesser time; is suitable for the large-scale production of graphene oxide; and reduces cost of production. DETAILED DESCRIPTION - One-pot (an electrochemical cell) and two steps electrochemical method for synthesizing graphene oxide (GO) and graphene oxide-metal composites including GO/copper, GO/iron, GO/cesium and GO/lanthanum, in the first step (a) the cell comprises the graphite electrode as both working as well as counter electrode, an electrolyte solution consisting of pure acids and a mixture of acids for anodic exfoliation of graphite, current density of 0.0625-0.625 A/cm2, distance between electrodes of 0.5-3 cm, and time of 1-30 minutes, at the end of step one, both working as well as counter electrode are replaced by dimensionally stable electrodes (DSE), the slurry comprising of exfoliated graphene sheets and the electrolytic solution remains in the electrochemical cell, and in the second step (b), the cell comprises the electrodes comprising DSE as both working as well as counter electrode, slurry of step one without or with addition of oxidizing agent and metal precursors depending upon the synthesis of graphene oxide alone or graphene oxide-metal composite having current density of 0.0625-0.3125 A/cm, distance between electrodes of 0.5-3 cm, time of 10-480 minutes, oxidizing agent concentration of 0.2-5 equivalent/l, and metal precursor concentration of 1-20 equivalent/l.