Preparation and properties of(NixCo1-x)0.85Se nano spherical cathode material for supercapacitor
Ni-Co bimetal selenide(NixCo1-x)0.85Se electrode material was prepared by solvothermal meth-od.The microstructure and elemental composition of the electrode material were measured by XRD,SEM,TEM and XPS.The electrochemical properties of the electrode material were tested by three-elec-trode system.(NixCo1-x)0.85Se presents a nano-spherical structure with a diameter of 200-500 nm.By adjusting the experimental conditions,the materials with different Ni/Co ratios were synthesized,in which(Ni0.50Co0.50)0.85Se had the maximum specific capacitance(2 900 F·g-1,1 A·g-1).(Ni0.50Co0.50)0.85Se was assembled with activated carbon to form hybrid supercapacitor,and the cycle stability was good(the capacitance retention rate was 83.21％after 2 500 charge-discharge cycles at 1 A·g-1 current density),indicating that Ni-Co selenide has high application value in the field of super-capacitor.
nickel cobalt selenidehybrid supercapacitornano spherical material
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