Hybrid high performance supercapacitor based on zeolitic imidazolate frameworks-67-derived nano-structure NiCo2S4

In this work, NiCo₂S₄, nickel-cobalt layered double hydroxides (NiCo-LDH) and CoS₂ electrodes are successfully prepared by using ZIF-67 as the precursor, the results show that NiCo-LDH and NiCo₂S₄ are nano-flower-like structures and CoS₂ exhibits a nano-cage structure. The electrochemical properties of the hybrid supercapacitor assembled with NiCo₂S₄ and activated carbon (AC) as electrodes were tested. As the positive electrode of NiCo₂S₄//AC hybrid supercapacitor, the NiCo₂S₄ electrode has the largest specific capacity of 2934 mAh g^?1 at a current density of 1 A g^?1. The NiCo₂S₄//AC capacitor generates the highest energy density of 38.8 Wh kg^?1 when the power density is 993.0 W kg^?1 and has a nice cycling performance with a capacity retention rate of 81.2% after 10,000 cycles at 5 A g^?1.