Ni(OH)_2-VS_2纳米复合材料的制备及在超级电容器上的应用

Synthesis of Ni(OH)_2-VS_2 Nanocomposite and Their Application in Supercapacitors

采用水热法合成Ni(OH)_2-VS_2纳米复合材料,通过X射线衍射(XRD)、扫描电子显微镜(SEM)等对复合材料物相及形貌进行表征.将所得的复合材料用作超级电容器电极材料,通过循环伏安法、恒电流充放电法以及交流阻抗法对Ni(OH)_2-VS_2纳米复合材料的电化学性能进行评价.同时探讨了Ni(OH)2与VS2的不同质量比对复合材料电化学性能的影响.结果表明:Ni(OH)2与VS2的质量比为5∶1时所制备的Ni(OH)_2-VS_2纳米复合材料具有更优异的电化学性能.在电流密度为1A/g时,比电容最高可达到4021F/g,且在电流密度为5A/g下进行500次充放电测试,电容保持率仍在80%以上.

Ni（OH）_2-VS_2 nanocomposites were synthesized using hydrothermal method.X-ray diffraction（XRD）and scanning electron microscope（SEM）were used to characterize the structure and morphology of the composites.The as-prepared nanocomposites were employed as electrode materials for supercapacitors and the electrochemical properties were studied by cyclic voltammetry（CV）,constant current charge and discharge and an impedance method.Meanwhile,the effect of the mass ratio of Ni（OH）2to VS2 on the electrochemical properties was discussed.The results showed that Ni（OH）_2-VS_2 nanocomposite had most excellent electrochemical performance with the mass ratio of 5∶1.It has the highest specific capacitance of 4021F/g（at a current density of 1A/g）and a long term cycling stability（80% capacitance retention after 500 cycles at a current density of 5A/g）.