GRAPHENE OXIDE PREPARED BY ELECTROCHEMICALLY OXIDIZING AND CUTTING END FACE OF CARBON-BASED THREE-DIMENSIONAL MATERIAL AND METHOD THEREFOR

摘要

The present invention relates to a method for preparing graphene oxide by cutting an end face of a 3-dimensional carbon-based material by electrochemical oxidation and the graphene oxide prepared by the method. The method comprises: connecting a piece of a 3-dimensinal carbon-based material as an electrode and another piece of a 3-dimensinal carbon-based material or inert material as another electrode to the two electrodes of a DC power supply respectively, wherein an end face of at least one piece of a 3-dimensinal carbon-based material serves as the working face and is positioned in contact and parallel with the liquid surface of an electrolyte solution; then electrifying the two pieces for electrolysis, during which the working zone for the end face serving as the working face is between -5 mm below and 5 mm above the liquid surface of the electrolyte solution; and intermittently or continuously controlling the end face within the working zone, such that the graphite lamella on the end face of the at least one piece of the 3-dimensinal carbon-based material as an electrode is expansion-exfoliated and cut into graphene oxide by electrochemical oxidation, to obtain a graphene oxide-containing electrolyte solution. The method has a higher expansion-based exfoliating and cutting ability by oxidation, and can produce high-quality graphene oxide having fewer layers and more uniform particle-size distribution with low energy consumption and no contamination.