FeCo2S4/Ni(OH)2的合成及超电容性能研究

将多组分活性材料组合成新的结构用作电极材料是提高超级电容器性能的一种有效措施。采用典型的两步水热法与电沉积法制备了FeCo2S4/Ni(OH)2复合纳米材料,并表征其物理及电化学性能。结果表明,FeCo2S4纳米花被电沉积上的Ni(OH)2纳米片包围,形成三维互连网状结构,有利于电极材料与电解液的充分接触。所得的FeCo2S4/Ni(OH)2复合电极材料显示出极高的比电容(当电流密度为1 A·g^-1时,比电容达1588.2 F·g^-1)、优异的倍率性能及循环稳定性。此外,以FeCo2S4/Ni(OH)2为正极、活性炭为负极组装了非对称超级电容器。结果显示,非对称超级电容器具有高能量密度及良好的循环稳定性。

Synthesis and supercapacitive performance of FeCo2S4/Ni(OH)2

Synthesizing newly structured electrode materials from multicomponent active materials is an effective measure to improve the performance of supercapacitors. Here FeCo2S4/Ni(OH)2 composite electrode nanomaterials were prepared by a typical two-step hydrothermal and electrodeposition method, and their physical and electrochemical properties were characterized. The results show that FeCo2S4 nanoflowers are surrounded by Ni(OH)2 nanosheets on electrodeposition to form a three-dimensional interconnected network structure, which is conducive to the full contact between the electrode material and the electrolyte. The FeCo2S4/Ni(OH)2 composite electrode exhibits a high specific capacitance(1588.2 F·g^-1 at 1 A·g^-1), excellent rate capability and cycle stability. In addition, an ASC was assembled using FeCo2S4/Ni(OH)2 as the positive electrode and activated carbon(AC) as the negative electrode, which shows a high energy density and remarkable cycling performance.