纳米针
材料科学
超级电容器
电极
扫描电子显微镜
介电谱
化学工程
电化学
循环伏安法
透射电子显微镜
多孔性
镍
电解质
纳米片
纳米技术
纳米结构
复合材料
冶金
化学
工程类
物理化学
作者
Peng Sun,Jicai Liang,Guangyi Chen,Yuhui Li,Kaiyuan Zhou,Jiaang Liu,Wenzhuo Zhang,Fu Niu,Wanxi Zhang
出处
期刊:Rare Metal Materials and Engineering
[Elsevier]
日期:2018-05-01
卷期号:47 (5): 1359-1364
被引量:2
标识
DOI:10.1016/s1875-5372(18)30135-8
摘要
Freestanding porous Co9S8 nanoneedle bundles arrays on Ni foam were in-situ synthesized by a facile ion exchange reaction and were directly used as the electrode for supercapacitors. The structure and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). Cyclic voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS) were adopted to evaluate the electrochemical property of the porous Co9S8 nanoneedle bundles arrays electrode in 3 mol/L KOH solution. The results show that the specific capacitance of the porous Co9S8 nanoneedle bundles arrays is 1400 F·g-1 at a current density of 4 A·g-1 and the arrays exhibit good cycling stability. The excellent electrochemical performance can be ascribed to the porous nanostructure of Co9S8 nanoneedle bundles arrays and the 3D conductive nickel foam, which can increase the contact areas between electrode and electrolyte and improve the conductivity of the whole electrode.
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