期刊
JOURNAL OF POWER SOURCES
卷 175, 期 1, 页码 680-685出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2007.09.004
关键词
COxNi1-x LDHs; potentiostatic deposition; specific capacitance; supercapacitor
Cobalt-nickel layered double hydroxides (CoxNi1-x LDHs) were deposited onto stainless steel electrodes by the potentiostatic deposition method at -1.0 V vs. Ag/AgCl using various molar ratios of Co(NO3)(2) and Ni(NO3)(2) in distilled water. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. A network of CoxNi1-x LDH nanosheets was obtained. The nature of the cyclic voltammetry and charge-discharge curves suggested that the CoxNi1-x LDHs exist in the form of solid solutions. The capacitive characteristics of the CoxNi1-x LDHs in 1 M KOH electrolyte showed that Co0.72Ni0.28 LDHs had the highest specific capacitance value, 2104 F g(-1), which is also the highest yet reported value for oxide materials in general. (c) 2007 Elsevier B.V. All rights reserved.
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