Facile approach to prepare loose-packed cobalt hydroxide nano-flakes materials for electrochemical capacitors

Cobalt hydroxide nano-flakes are successfully synthesized by a facile chemical precipitation method. Electrochemical characterization is performed using cyclic voltammetry, chronopotentiometry and impedance spectroscopy, respectively. These cobalt hydroxide nano-flakes maintain high utilization at h...

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Bibliographic Details
Published in:Journal of power sources 2009-12, Vol.194 (2), p.1194-1201
Main Authors: Kong, Ling-Bin, Lang, Jun-Wei, Liu, Min, Luo, Yong-Chun, Kang, Long
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors. Resistors. Filters
Cobalt hydroxide
Electrical engineering. Electrical power engineering
Electrochemical capacitors
Exact sciences and technology
Nano-flakes
Pseudo-capacitance
Specific capacitance
Various equipment and components
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Summary:Cobalt hydroxide nano-flakes are successfully synthesized by a facile chemical precipitation method. Electrochemical characterization is performed using cyclic voltammetry, chronopotentiometry and impedance spectroscopy, respectively. These cobalt hydroxide nano-flakes maintain high utilization at high rates of discharge. A maximum specific capacitance of 735 F g −1 can be achieved in 2 M aqueous KOH with the potential range from −0.2 to 0.4 V (vs. SCE) in a half-cell setup configuration for the nano-flakes Co(OH) 2 electrode, suggesting its potential application in electrochemical capacitors. Furthermore, the effect of annealing temperatures on the electrochemical capacitance characteristics is also been systematically explored.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2009.06.016