在CoS纳米花基底上生长NiS合成层级NiS@CoS复合微米花材料,微米花由许多不规则纳米片交错组装而成。该微观形貌可缩短电子传输途径,使材料不易团聚,提高循环稳定性。结果表明,层级NiS@CoS复合微米花具有优良的超级电容器电极性能,在6 mol/L KOH溶液中,电流密度为2 A/g时比电容量最高达到1 205 F/g;复合材料电极在功率密度为400 W/kg时,能量密度可达26.8 Wh/kg;1 000圈恒电流充放电循环后,比电容仍可保持其初始电容的91.27%。表明制备的层级NiS@CoS复合微米花可用作超级电容器电极材料。

A novel hierarchical NiS@CoS composite micron flowers material is developed through growing NiS on nano flower-like CoS substrate,which involves in hydrothermal and microwave-assisted two-step strategy.The as-prepared NiS@CoS micron flowers are constructed by irregular nanosheets intertwined with each other,such a micro morphology can shorten the electron transmission path,make the material difficult to agglomerate and improve the cycle stability.Correspondingly,the hierarchical NiS@CoS micron flowers have excellent electrode performance for supercapacitors.At a current density of 2 A·g^-1,the specific capacitance of NiS@CoS micron flowers can be up to 1,205 F·g^-1 in a 6 mol·L^-1 KOH solution.The energy density of NiS@CoS composite-based electrode can reach 26.8 Wh·kg^-1 at a power density of 400 W·kg^-1.Its specific capacitance can still maintain 91.27% of its initial capacitance after 1 000 cycles of constant current charge and discharge at 30 A·g^-1.It is verified that the prepared hierarchical NiS@CoS composite micron flowers can be used as electrode material for supercapacitor.