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

Abstract

Abstract It is an effective way to prepare multi‐dimensional and multicomponent electrode material to enhance the capacitance of supercapacitors. The multi‐dimensional micro CuCo 2 O 4 /nano NiCo 2 S 4 structure was synthesized by wrapping NiCo 2 S 4 nanosheets on urchin‐like CuCo 2 O 4 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 CuCo 2 O 4 and the two‐dimensional NiCo 2 S 4 composite and its especial three‐dimensional core‐shell structure, the composite electrode shows excellent supercapacitor performance. The CuCo 2 O 4 @NiCo 2 S 4 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.