Flexible CuCo2O4 @Ni-Co-S hybrids as electrode materials for high-performance energy storage devices

Rational design of electrode meterials with unique core-shell nanostructures is of great significance for improving the electrochemical performance of supercapacitors. In this work, we prepare several CuCo2O4 @Ni-Co-S composite electrodes by a controllable hydrothermal and electrodeposition route. One-dimensional nanowires can shorten the ions transport path, while two-dimensional nanosheets expose many active sites. This enables three-dimensional structured composite with high electrochemical ac-tivity. The as-prepared heterostructured materials show a specific of 1048 C/g at 1 A/g. It still maintains 75.6% of initial capacity after 20 0 0 0 cycles at 10 A/g. The device delivers an energy density of 79.2 Wh/kg when the power density reaches to 2280 W/kg. Moreover, it possesses an excellent mechanical stability after repeated folding at different angles (c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

Rational design of electrode materials with core-shell nanostructures is important for improving the electrochemical performance of supercapacitors. In this study, several CuCo2O4 @Ni-Co-S composite electrodes were prepared, which showed high electrochemical activity as a result of their three-dimensional structure. The heterostructured materials exhibited a specific capacitance of 1048 C/g at 1 A/g, and maintained 75.6% of their initial capacity after 2000 cycles at 10 A/g. With a power density of 2280 W/kg, the device achieved an energy density of 79.2 Wh/kg.