Nanohoneycomb-like manganese cobalt sulfide/three dimensional graphene-nickel foam hybid electrodes for high-rate capability supercapacitors

Nanohoneycomb-like manganese cobalt sulfide/three dimensional graphene-nickel foam hybrid electrodes for supercapacitor are synthesized by chemical vapor deposition and electrodeposition. The ternary sulfide electrode exhibits high specific capacitance (1938 F g ⁻¹ at 5 A g ⁻¹ ) with excellent rate capability (76.8% capacitance retention at 100 A g ⁻¹ ) due to the intercrossed feature of the nanowalls and three-dimensional interpenetrating nanoarchitecture. Moreover, the specific capacitance of the electrode after 4000 cycles at a high current density of 50 A g ⁻¹ is 1320 F g ⁻¹ . The asymmetric supercapacitor assembled with the manganese cobalt sulfide electrode and an activated carbon electrode displays an energy density of 14.33 W h kg ⁻¹ at a power density of 74.87 W kg ⁻¹ . The manganese cobalt sulfide is a promising electrode material for practical application.