▎ 摘　　要

NOVELTY - Electrochemical-stripping preparation of in-situ oxygen-doped three-dimensional graphene, involves pretreating a graphite sheet, freezing in liquid nitrogen for 1 second to 2 hours, carrying out physical expansion treatment to obtain expanded graphite sheet, and converting expanded graphite sheet into oxygen-doped three-dimensional graphene by electrochemical stripping. USE - Preparation of oxygen doped three-dimensional graphene used as anode material for oxygen evolution reaction in water splitting (all claimed). ADVANTAGE - The method enables economical industrial preparation of graphene material in short period of time using a simple equipment and inexpensive raw materials, when compared to precious metal catalysts. The oxygen-doped three-dimensional graphene material can be grown directly on the surface of graphene material, can be used directly as anode material without requiring secondary electrode preparation, and has an overpotential as low as 268 mV in acidic electrolyte, and excellent catalytic activity and stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for in-situ oxygen-doped three-dimensional graphene.