Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 18, Pages 9709-9715Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.06.036
Keywords
CoS; Hydrothermal method; L-cysteine; Electrochemical capacitor; Metal sulfide
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Funding
- Ministry of New and Renewable Energy, Government of India [102/28/2006-NT]
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Sphere-like CoS nanostructures are synthesized in water/ethylene glycol mixed solvents by simple hydrothermal technique using L-cysteine amino acid as a source of sulfur. The results obtained by BET and BJH methods reveal that the CoS has mesoporous bimodal pore distribution in the range of 2-23 nm with a dominant peak around 12.4 nm and a small peak at 2.4 nm. The electrochemical experiments demonstrate that CoS has a high-rate capability for capacitor applications. The reduction of the specific capacitance is very marginal by about 13% of the available capacitance of 363 F g(-1) when the scan rate is increased by 10 times. Even at very high frequency of 10 Hz, it retains the specific capacitance value of 150 F g(-1), which confirms its higher power capability. Furthermore, during the cycling process, the Coulombic efficiency is better than 90% demonstrating excellent reversibility of CoS electrode. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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