One-pot hydrothermal preparation of Cu2O-CuO/rGO nanocomposites with enhanced electrochemical performance for supercapacitor applications
Abstract
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.
- Publication:
-
Applied Surface Science
- Pub Date:
- August 2018
- DOI:
- 10.1016/j.apsusc.2017.12.199
- Bibcode:
- 2018ApSS..449..474M
- Keywords:
-
- Cu<SUB>2</SUB>O-CuO;
- Reduced graphene oxide;
- Nanocomposites;
- Ragone plot;
- Supercapacitor