期刊
JOURNAL OF POWER SOURCES
卷 180, 期 1, 页码 676-681出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2008.01.085
关键词
supercapacitor; cobalt sulfide; hydrothermal synthesis; biomolecule; nanowire
A biomolecule-assisted hydrothermal process is developed to synthesize cobalt sulfide (CoS), in which L-cysteine is used as the sulfide source and directing molecule. By controlling the synthesis conditions, CoS nanospheres and nanowires can be assembled. The as-synthesized samples are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are used to study the effects of microstructure and morphology of the samples on their capacitance and conductivity. A specific capacitance, as high as 508 F g(-1), is achieved for CoS nanowires. This is very competitive with the best supercapacitor material, RuO2 (720-760 Fg(-1)), but its cost is remarkably lower than RuO2. Thus the nanowires are a promising material for low-cost, high-performance supercapacitors. This method could provide a universal green chemistry approach to synthesize other metal sulfides. (C) 2008 Elsevier B.V. All rights reserved.
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