A novel method to synthesize whisker-like Co(OH)2 and its electrochemical properties as an electrochemical capacitor electrode
A novel method to synthesize whisker-like Co(OH)2 and its electrochemical properties as an electrochemical capacitor electrode
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DOI：
10.1016/j.electacta.2010.09.037
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发表时间：
2010-12
影响因子：
6.6
通讯作者：
C. Yuan;L. Hou;Laifa Shen;Diankai Li;Fang Zhang;C. Fan;Jiamao Li;Xiaogang Zhang
中科院分区：
文献类型：
--
作者：
C. Yuan;L. Hou;Laifa Shen;Diankai Li;Fang Zhang;C. Fan;Jiamao Li;Xiaogang Zhang
以聚乙二醇4000为软模板剂，在超声条件下合成了疏松晶须状Co（OH）sub 2，并将其作为电化学电容器的活性电极材料进行了研究。用X射线衍射仪和透射电子显微镜研究了Co（OH）{sub 2}的组成和微观结构。基于傅里叶变换红外光谱分析，提出了Co（OH）{sub 2}晶须的形成机理。电化学研究表明，晶须状的Co（OH）{sub 2}在20 mA/cm{sup 2}的电流密度下提供325 F/g的比电容（约100 mA/cm{sup 2}）。1.3 A/g），甚至在80 mA/cm{sup 2}下为279 F/g（约5.3 A/g），表明其具有快速的电化学响应特性。电容衰减约为。在1000次循环中，Co（OH）{sub 2}的稳定性为7%，表明其具有良好的电化学电容器循环稳定性。
A loose whisker-like Co(OH){sub 2} was synthesized by means of polyethylene glycol 4000 as soft template under ultrasonic condition, and investigated as an active electrode material for electrochemical capacitors. The composition and microstructure of the as-prepared Co(OH){sub 2} were investigated by X-ray diffraction spectroscopy and transmission electron microscopy. The formation mechanism of the whisker-like Co(OH){sub 2} was attentively proposed based on Fourier transform infrared spectroscopy analysis. Electrochemical studies revealed that the whisker-like Co(OH){sub 2} delivered a specific capacitance of 325 F/g at a current density of 20 mA/cm{sup 2} (ca. 1.3 A/g) and even 279 F/g at 80 mA/cm{sup 2} (ca. 5.3 A/g) due to its special nanostructure, indicating its fast electrochemical response property. A capacitance attenuation of ca. 7% over 1000 cycles meant the good cyclic stability of the whisker-like Co(OH){sub 2} for electrochemical capacitors application.