Facile synthesis of dendritic Ni3S2 nanosheet arrays for hybrid supercapacitor electrodes

Nanostructured Ni 3 S 2 is considered to be one of the most promising energy storage materials due to its high theoretical specific capacitance and excellent conductivity. In this work, we prepare dendritic Ni 3 S 2 nanosheet arrays by one-step solvothermal method. The as-prepared samples as binder-free electrode present a specific capacity of 863.55 C g −1 at 1 A g −1 . The assembled hybrid supercapacitor owns an energy density of 33.7 W h kg −1 at 1396.7 W kg −1 . Such excellent electrochemical performance can be ascribed to its unique structure and the direct contact between Ni 3 S 2 and Ni foam, which can ensure rapid ion and electron transfers during redox reactions.