Rubik’s cube-like Ni3S4/CuS2 nanocomposite for high-performance supercapacitors

Transition metal sulfide, a promising electrode material using for supercapacitors , has attracted broad attention. In this work, a Rubik’s cube-like Ni 3 S 4 /CuS 2 nanocomposite has been successfully fabricated by vulcanizing the Ni(OH) 2 /CuS 2 precursor prepared via sacrificial template method. The obtained Ni 3 S 4 /CuS 2 have a high specific capacitance of 888 F g −1 at 1 A g −1 and superior cycling stability of 83.33% retention after 2000 circles. Furthermore, the asymmetric supercapacitor , based on the Ni 3 S 4 /CuS 2 nanocomposite and the reduced graphene oxide , shows an ultra-high energy density of 49.68 Wh kg −1 at the power density of 400 W kg −1 .