Hierarchical NiCo2S4@Ni3S2 core/shell nanorod arrays supported on carbon cloth for all-solid-state flexible asymmetric supercapacitors

Flexible electrodes for preparing core–shell structures are receiving increasing attention. A composite electrode material with NiCo 2 S 4 as the core and Ni 3 S 2 as the shell was successfully synthesized by hydrothermal synthesis and electrodeposition method. The prepared flexible NiCo 2 S 4 @Ni 3 S 2 core/shell nanorod array has higher electrochemical performance, with specific capacitance of 5.714 F cm −2 at 2 mA cm −2 and excellent cycle stability. In addition, the prepared flexible hybrid supercapacitor has been assembled with NiCo 2 S 4 @Ni 3 S 2 as the positive electrode and Fe 2 O 3 -rGO as the negative electrode, delivering an energy density of 5.9 mWh cm −3 at 171 mW cm −3 . These results make the NiCo 2 S 4 @Ni 3 S 2 a high-performance supercapacitor application candidate.