A high-performance supercapacitor electrode material based on NiS/Ni 3 S 4 composite

In this work, nickel sulfides were prepared via a facile hydrothermal method. The particle size and phase composition were tuned by the reaction temperature. Phase-property relationship of NiS/Ni3S4 was established through combining characterization analysis with electrochemical tests. With the favorable particle size and composition, the NiS/Ni3S4 composite delivered preferable gravimetric capacity (194.4 mAh g−1 at 2 A g−1, and 133.1 mAh g−1 at 10 A g−1) and impressive circling stability (89.5 mAh g−1 at 10 A g−1 after 5000 cycles).