Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 1, Pages 115-121Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.09.037
Keywords
Co(OH)(2); Whisker-like; Electrochemical capacitors; Electrochemical response
Categories
Funding
- National Basic Research Program of China (973 Program) [2007CB209703]
- National Natural Science Foundation of China [20633040, 20873064]
- 2010 Young Teachers' Research Foundation of Anhui University of Technology [QZ201003]
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A loose whisker-like Co(OH)(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)(2) were investigated by X-ray diffraction spectroscopy and transmission electron microscopy. The formation mechanism of the whisker-like Co(OH)(2) was attentively proposed based on Fourier transform infrared spectroscopy analysis. Electrochemical studies revealed that the whisker-like Co(OH)(2) delivered a specific capacitance of 325 F/g at a current density of 20 mA/cm(2) (ca. 1.3 A/g) and even 279 F/g at 80 mA/cm(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)(2) for electrochemical capacitors application. (C) 2010 Elsevier Ltd. All rights reserved.
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