Multi‐Dimensional Binary Micro CuCo2O4/Nano NiCo2S4 for High‐Performance Supercapacitors

Abstract

AbstractIt is an effective way to prepare multi‐dimensional and multicomponent electrode material to enhance the capacitance of supercapacitors. The multi‐dimensional micro CuCo2O4/nano NiCo2S4 structure was synthesized by wrapping NiCo2S4 nanosheets on urchin‐like CuCo2O4 microspheres on the surface of nickel foam by two‐step hydrothermal method, and then electrochemical deposition. Due to the synergistic effect of the one‐dimensional CuCo2O4 and the two‐dimensional NiCo2S4 composite and its especial three‐dimensional core‐shell structure, the composite electrode shows excellent supercapacitor performance. The CuCo2O4@NiCo2S4 with three electrodeposition cycles (CCO@NCS‐3) exhibits a high specific capacitance of 2283.3 F g−1 at 1 A g−1, good rate capability (79.9 % capacitance retention at 10 A g−1) and cycling stability of 84.0 % over 3000 cycles. All these results indicate that the concepts of multi‐dimensional and multi‐component integration provide a general approach for the development of high‐performance materials.