One-pot hydrothermal preparation of Cu2O-CuO/rGO nanocomposites with enhanced electrochemical performance for supercapacitor applications

• Published in: Applied surface science Vol. 449; pp. 474 - 484
• Main Authors: D., Muthu Gnana Theresa Nathan, S., Jacob Melvin Boby, Basu, Prabir, R., Mahesh, S., Harish, Joseph, Shibu, P., Sagayaraj
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2018
• Subjects: Cu2O-CuO; Nanocomposites; Ragone plot; Reduced graphene oxide; Supercapacitor; Supercapacitor; Reduced graphene oxide; Nanocomposites; Ragone plot; Cu2O-CuO
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.12.199

[Display omitted] •Cu2O-CuO/rGO nanocomposites were prepared via one-pot hydrothermal route.•Specific capacitance of Cu2O-CuO/rGO1 was found to be 436.6 F g−1 at 1 A g−1.•The nanocomposites demonstrate high capacity and good cyclability.•The incorporation of rGO enhances the electrochemical performance of nanocomposites. The preparation of copper oxides/reduce graphene oxide (Cu2O-CuO/rGO) nanocomposites via a simple hydrothermal route is reported. The Cu2O-CuO/rGO nanocomposites are synthesized through redox reaction between CuCl2·2H2O and graphene oxide (GO) without using any reducing agent. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results authenticate the formation of Cu2O-CuO/rGO nanocomposites. It is evident from the high resolution transmission electron microscopy (HRTEM) images that the Cu2O-CuO nanorods are firmly wrapped on the rGO sheets. The electrochemical properties are investigated employing cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. The Cu2O-CuO/rGO1 nanocomposites demonstrate highest specific capacitance of 436.6 F g−1 at 1 A g−1 and excellent cyclic stability with no variation in the capacitance even after 1000 cycles.