Carambola-like Ni@Ni1.5Co1.5S2 for Use in High-Performance Supercapacitor Devices Design

Studies on supercapacitor devices constitute one of the most meaningful research topics in hastening the industrialization of electrode materials. Herein, uniform nanosheet-based carambola-like Ni@Ni1.5Co1.5S2 was successfully synthesized and assembled into an asymmetric supercapacitor device with a high specific capacitance of 109 F g(-1) at a current density of 1 A g(-1). The large mass loading of this device, at similar to 20 mg cm(-2), is compatible with the industry standard and considerably higher than those obtained in previous reports. The Ni@Ni1.5Co1.5S2-based supercapacitor device exhibited excellent cycling stability with virtually no decrease in capacitance after 2000 cycles, and achieved a high energy density of 65.7 W h kg(-1) at a power density of 22.2 W kg(-1) and a high power density of 3 kW kg(-1) at energy density of 6.2W h kg(-1). These outstanding characteristics of Ni@Ni1.5Co1.5S2 as an electrode material for supercapacitor devices verify its promising applicability in the energy storage field.