CuCo2O4 nanowire arrays wrapped in metal oxide nanosheets as hierarchical multicomponent electrodes for supercapacitors

Herein, we report the rational design and fabrication of multicomponent, hierarchical CuCo2O4 nanowire arrays wrapped with metal oxides (NiO, Co3O4 and MnO2) nanosheets for use in high-performance supercapacitors. Among all the composite electrodes prepared, the CuCo2O4@NiO electrode exhibits the best electrochemical behavior with a high areal capacitance of 2.3 F/cm2 at 2 mA/cm2 and excellent cycling stability. The asymmetric supercapacitor with CuCo2O4@NiO as the positive electrode shows a superior specific capacitance of 124.6 F/g at 1 A/g, exceptional energy density of 38.9 Wh/kg at 750 W/kg, and long cycle life with ∼81.3% capacitance retention after 6000 cycles. The results indicate that the CuCo2O4@NiO electrode shows great potential for high-performance electrochemical energy storage. © 2019 Elsevier B.V.