Boosting energy and power of Cu-doped NiCo2S4/graphite electrode for high performance supercapacitors

Cu-doped NiCo2S4/flake graphite nanosheet arrays were prepared by multi-step hydrothermal calcination. Three-dimensional structure provides a wealth of active sites and structure stability to improve the charging/discharging rate. Moreover, 5% Cu-doped NiCo2S4/flake graphite composite fulfills an excellent specific capacitance of 3080 F.g(-1) at 1 A.g(-1) and remains 2600 F.g(-1) at 20 A.g(-1) with an outstanding capacitance retention rate of 86% at 20 times current density. The all-solid supercapacitor with 5% Cu-doped NiCo2S4/flake graphite electrode and activated carbon electrode exhibits an excellent energy density of 79.4 Wh.g(-1) at a power density of 400 W.kg(-1) with an outstanding cycling stability of 94% retention after 10000 cycles, suggesting its great potential for the development of high-performance energy storage devices. (C) 2022 Published by Elsevier B.V.

Automated summary

Cu-doped NiCo2S4/flake graphite composite with a three-dimensional structure was prepared, exhibiting excellent specific capacitance, capacitance retention rate, energy density, and cycling stability. It shows great potential for the development of high-performance energy storage devices.