基于菊科植物Gerbera delavayi Franch.绒毛衍生生物碳与片状镍钴硫化物复合材料的高性能超级电容器电极

As highly efficient energy storage devices, performances of the supercapacitors are seriously influenced by electrochemical properties of the electrodes. This work is aimed at electrochemical properties improvement of the composites of biocarbon and nanocrystalline NiCo 2 S 4 (NCS) via stimulating synergistic effect of the conductive skeleton and the active redox material for advanced electrodes in supercapacitors. Nitrogen-doped and activated biocarbon (NAGC) with hollow-tubular structure derived from flocs on the underside of Gerbera delavayi Franch. Leaves were anchored with sheet-like NiCo 2 S 4 (NCS-S) nanocrystalline. Specific capacitances of 2282 F g −1 at 1 A g −1 was achieved by the NAGC@NCS-S electrode. Meanwhile, the capacitance retention is 98.96% over 5000 galvanostatic charge–discharge (GCD) cycles. An asymmetric supercapacitor (ASC) structured with NAGC@NCS-S//NAGC obtained high energy density of 58.1Wh kg −1 at power density of 935.1 W kg −1 , and a capacitance retention of 96.5% over 5000 GCD cycles.