Co3S4/NiCo2S4 Nano-Arrays on Nickel Foam as Energy Storage for Supercapacitors

In this work, Co 3 S 4 /NiCo 2 S 4 nano-arrays electrode with Co 3 S 4 nanocones and NiCo 2 S 4 nanosheets interlaced arrangement are prepared by the promising hydrothermal method. Compared with single Co 3 S 4 /NF or NiCo 2 S 4 /NF electrode, the prepared Co 3 S 4 /NiCo 2 S 4 /NF electrode exhibits excellent specific capacitance. At a current density of 2 mA cm −2 , the surface capacitance is as high as 9036 mF cm −2 , and it still maintains a surface capacitance of 5664 mF cm −2 at a current density of 8 mA cm −2 . Co 3 S 4 /NiCo 2 S 4 /NF||ASC has a high electrochemical performance with a maximum energy density of 0.62 Wh cm −3 and a power density of 15.94 W cm −3 . At a current density of 5 mA cm −2 , the capacity retention rate is 83.75% after 3000 cycles.