Preparation of reduced graphene oxide electrodes treated by electron beam irradiation and their electrochemical behaviors

摘要

We have demonstrated the preparation of reduced graphene oxide (RGO) using a two-step synthesis by a modified Hummer's method and borohydride reduction. To study effect of electron beam irradiation to RGO-based electrodes, the samples were prepared by changing the exposure dose of radiation. The structure and morphology analysis was performed by scanning electron microscopy, Fourier transform infra-red spectroscopy (FT-IR) and X-ray diffraction. Electrochemical properties were characterized by cyclic voltammetry and galvanostatic charge-discharge tests were performed in 6 M KOH. The maximum specific capacitance of 200 kGy RGO at a current density of 1 A/g was 273.5 F/g. The RGO electrode irradiated by electron beam with the dose of 200 kGy showed the best energy storage performance such as high capacitance and good rate capability. As a result of this study, the RGO irradiated by an electron beam showed superior capacitance than did pristine RGO.