Designed Construction of Hierarchical CuCo2S4@Co(OH)2 Core-Shell Nanoarrays as Electrode Materials for High-Performance Supercapacitors

In this paper, a novel three-dimensional (3D) hierarchical structure of CuCo2S4@Co(OH)(2) core-shell hybrid electrode was reported. It uses self-supporting nanoneedles CuCo2S4 without organic binders synthesized by hydrothermal method as ideal conductive supports for Co(OH)(2) nanosheets. The prepared CuCo2S4@Co(OH)(2) composite electrode has good electrochemical performance with a specific capacitance of 2066 F.g(-1) at 1A.g(-1) (highest specific capacity of 258 mAh.g(-1)) and a high capacitance retention rate (over 82.76% at 10A.g(-1) after 1000 cycles). The asymmetric supercapacitor device (CuCo2S4@Co(OH)(2)//AC) has an energy density of 37.58Wh.kg(-1) at 795.8W.kg(-1), and a high capacitance retention rate over 84.10% after 5000 cycles at 10A.g(-1), which exhibits the enormous potential of this hybrid nanostructure as high performance supercapacitor electrode material.