RGO/ZnCo2O4 Composites as an Electrode Material for High-Performance Supercapacitor Application

Abstract

Recently, composite material-based supercapacitors have attracted a lot of attention due to their enhanced
performance. In this work, we present a facile synthesis of RGO/ZnCo2O4 direct solution-based composites through a hydrothermal route anchored on nickel foam. ZnCo2O4 nanospheres wrapped under ribbon-like RGO nanosheets combine the synergistic properties of both in the form of hybrid electrode material. As a result, the RGO/ZnCo2O4 electrode exhibits a specific capacitance of 755.38 F/g at a scan rate of 5 mV/s with improved cyclic stability up to 2000 cycles. In addition to this, the hybrid electrode material also shows a good value for energy density and power density as 10.75 Wh/kg and 1500 W/kg at a current density of 1 A/g with 93.47% efficiency. This study thus signifies that the synergistic effect of both the electrodes in combination as a hybrid gives a better performance than the individual ones.