Dual-functional NiCo2S4 polyhedral architecture with superior electrochemical performance for supercapacitors and lithium-ion batteries.

NiCo 2 S 4 polyhedral architectures with high surface area, stable architecture and good crystallinity successfully are prepared with NiCo 2 O 4 as precursors. Impressive electrochemical performances including high specific capacitance, good rate capability and cycling stability are achieved owing to the particular polyhedral structure with more active sites for ions reaction and sufficient space for ions transmission. The as-prepared NiCo 2 S 4 electrode for supercapacitor displays high specific capacitance of 1298 F g−1 at 1 A g−1 and a superior rate capability of ~80.4% at 20 A g−1. Also, capacitance retention of 90.44% can be realized after 8000 cycles. In addition, the NiCo 2 S 4 as anode delivers high initial charge/discharge capacities of 807.6 and 972.8 mAh g−1 at 0.5 C. Dual-functional NiCo 2 S 4 polyhedral architectures with outstanding electrochemical performance for supercapacitors and lithium-ion batteries (LIBs) have been rationally designed and successfully synthesized by a hydrothermal method. The as-synthesized NiCo 2 S 4 electrode for supercapacitor exhibits an outstanding specific capacitance of 1298 F g−1 at 1 A g−1 and an excellent rate capability of ~80.4% at 20 A g−1. Besides, capacitance retention of 90.44% is realized after 8000 cycles. In addition, the NiCo 2 S 4 as anode in LIBs delivers high initial charge/discharge capacities of 807.6 and 972.8 mAh g−1 at 0.5 C as well as good rate capability. In view of these points, this work provides a feasible pathway for assembling electrodes and devices with excellent electrochemical properties in the next generation energy storage applications. [ABSTRACT FROM AUTHOR]