Preparation And Properties Measurement Of Nickel-cobalt Sulfide

With the development of economy and the demand for clean energy,energy storage devices with high power density and high energy density have become the hot research point.The supercapacitor not only meet the requirements of high power density and high energy density,but also has good cycle stability.Transition metal sulfides have received much attention due to the excellent performance and potential applications in electronic,optical and optoelectronic devices.1.Using sodium acetate as a surface active agent,we had successfully prepared the hollow sphere nickel cobalt sulfides nanostructure,which have a high specific capacitance of 756 F g-1 at a current density of 1 A g-1.2.The mechanism for the formation of the hollow structure was also carefully discussed.3.Composites of nickel cobalt sulfides and graphene oxides had been prepared.The electrochemical measurements showed that the composites have a specific capacitance of 1137 F g-1 at the current density of 1A g-1.4.With the composites as electrode materials,asymmetric capacitors with high power density and excellent cycle stability was assembled.