镍钴硫化物的制备及其反应温度对形貌和超级电容器性能的影响

Preparation of Ni-Co sulfide and the influence of reaction temperature on the morphology and the properties of supercapacitor

采用一步溶剂热合成法制备了镍钴硫化物纳米微球,利用X射线衍射光谱(XRD)、扫描电子显微镜(SEM)和X光电子能谱(XPS)对制备的材料进行了表征。采用循环伏安和恒电流充放电等电化学方法考察了镍钴硫化物用作超级电容器的电极材料的性能。160℃制备的材料在2mA/cm^2的电流密度下,测得的质量比电容和面积比电容分别为1 298F/g和1.13F/cm^2。在电流密度为10mA/cm^2下,经过10 000圈的循环稳定性测试后,比电容保持了原来的70.8%。此外,通过对反应温度的控制,研究了反应温度对其超级电容器性能的影响。结果表明,反应温度对生成物的形貌几乎没有什么影响,对其电化学性能有一定的影响。

Nickel cobalt sulfidenanospheres was synthesized by facile solvothermal synthesis method. The properties of the as-prepared Ni-Co sulfide powders were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and X-ray photoelectron spectroscopy （XPS）. Cyclic voltammetry （CV）, galvanostatic charge-discharge measurement were also employed to test the electrochemical performances of nickel cobalt sulfide as electrode material of supercapacitor. The mass specific capacitance and the area specific capacitance of the electrode prepared under 160℃ was 1 298 F/g and 1.13 F/cm^2 respectively at charge and discharge current density of 2 mA/cm^2. After a 10 000 cycle test at current density of 10 mA/cm^2, the specific capacitance retains 70.8; of its initial capacitance. In addition, the influence of reaction temperature on the performance of the supercapacitor was studied by controlling the reaction temperature. The results show that the reaction temperature have little influence on its morphologies, but a certain impact on electrochemical performance.