Hydrothermal preparation of hematite nanotubes/reduced graphene oxide nanocomposites as electrode material for high performance supercapacitors

摘要

We report the fabrication of hematite nanotubes/reduced graphene oxide (alpha-Fe2O3 NTs/rGO) nano composites via a one-step hydrothermal process without using any template. The structure and morphology of the samples are confirmed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). Electrochemical performances of the samples are investigated employing cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The alpha-Fe2O3 NTs/rGO demonstrated a maximum specific capacitance of 262.2 F g(-1) at 1 A g(-1) and good cyclic stability at 5 A g(-1) with 96% capacitance retention after 500 cycles. The integration of alpha-Fe2O3 NTs with rGO sheets improved the electrochemical performances. (C) 2017 Elsevier B.V. All rights reserved.