▎ 摘　　要

In this paper, we reported the effect of secondary intercalation by introducing a hydroxyl group (-oxide by hydroxyl (OH)) on the surface of graphene (GO) to prepare a large quantities of low-layer graphene. The (Scanning Electron Microscope) SEM,(Transmission Electron Microscope) TEM and (Atomic Force Microscope) AFM analyses showed that the graphene distribution was uniform with an atomic thickness of approximately 1-2 layers. The standardless standard quantitative analysis indicated that the 0 content was only 3.53% and the impurity element content was only 0.29%, which indicated that the graphene was reduced. (X-ray photoelectron spectroscopy) XPS and FT-IR analyses demonstrated that most oxygen-containing functional groups between the graphene sheets were converted and removed. When tested as a supercapacitor electrode, RGO-C-2 exhibited significant electrochemical enhancement and better cycle stability than an electrode produced by a conventional modified Hummers' method. The specific capacity, energy density and power density of RGO-C-2 are respectively 278.91 F g(-1), 38.74 W h kg(-1), and 50 W kg(-1). This experimental study can provide research guidance for the design of modification of oxygen-containing functional groups on the surface of GO. (C) 2020 Elsevier Ltd. All rights reserved.