Abstract
Sustainable fabrication of flexible hybrid supercapacitor electrodes is extensively investigated during the current era to solve global energy problems. Herein, we used a cost-effective and efficient electrophoretic deposition (EPD) approach to fabricate a hybrid supercapacitor electrode. ZnO/CuO and ZnO/CuO/rGO heterostructure were prepared by sol-gel synthesis route and were electrophoretically deposited on indium tin oxide (ITO) substrate as a thin uniform layer using 1 V for 20 min at 50 mV/s. ZnO/CuO and ZnO/CuO/rGO heterostructure coated ITOs were then employed as the working electrode in a three-electrode setup for supercapacitor measurements. The fabricated electrodes have been investigated by Galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) to study their charge storage properties. ZnO/CuO revealed a specific capacitance of 1945 F g−1 at 2 mV/s and 999 F g−1 at 5 A g−1. However, an increased specific capacitance of 2305 F g−1 was measured for ZnO/CuO/rGO heterostructure at 2 mV/s and 1235 F g−1 at 5 A g−1. The lower internal resistance was observed for ZnO/CuO/rGO heterostructure, indicating good conductivity of the electrode material. Thus, the overall results of the current study suggest that EPD-assisted ZnO/CuO/rGO heterostructure hybrid electrode possess a substantial potential for energy storage as a supercapacitor.
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•Sol gel synthesis of heterostructure ZnO/CuO and ZnO/CuO/rGO nanocomposites.•Electrophoretic fabrication heterostructures based thin film.•ZnO/CuO revealed a specific capacity of 600 Cg-1 at 5 A g−1•ZnO/CuO/rGO heterostructure 741 Cg-1.