Facile Synthesis of Ultrathin NiCo2S4 Nano-petals Inspired by Blooming Buds for High-Performance Supercapacitors
3D petals-like NiCo2S4 nanostructures have been fabricated via a simple, mild and efficient hydrothermal strategy and the growth mechanism of NiCo2S4 nano-petals has been investigated. Such NiCo2S4 nano-petals electrode can deliver an ultrahigh specific capacitance of 2036.5 F g-1 at a current density of 1 A g-1, superior rate capability and remarkable cycle stability (94.3% capacitance retention after 5000 cycles). As-fabricated asymmetric supercapacitor based on NiCo2S4 nano-petals//active carbon electrodes demonstrates a high energy density of 35.6 Wh kg-1 at a power density of 819.5 W kg-1, with both long-term cycling and high rate stabilities. Such supercapacitor has been tested to power ten LEDs (2.03 V, 20 mA) in series for around 60 minutes, indicating great potential in practical application.