Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 157, Issue 7, Pages A818-A823Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3425624
Keywords
carbon nanotubes; current density; differential scanning calorimetry; electrochemistry; nanocomposites; nickel compounds; potentiometers; scanning electron microscopy; supercapacitors; transmission electron microscopy; X-ray diffraction
Funding
- NSFC [200933005, 20903077, 50702047]
- National 973 Program [2009CB220102]
- Key Project Founded by Fujian Province [2008H0087]
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A simple hydrothermal synthesis method is adopted to prepare nickel oxide/carbon nanotube (NiO/CNT) composites. X-ray diffraction, differential scanning calorimetry/thermogravimetric analysis, transmission electron microscopy, scanning electron microscopy, and N-2-adsorption/desorption techniques are employed for morphology and structure characterizations. The different morphologies of NiO are obtained, which change from a two-dimensional flake to a zero-dimensional mesoporous sphere, dispersing on the surface of CNTs by changing the sodium dodecyl sulfate's fraction in the reacting system. The electrochemical performance of NiO/CNT composites is largely affected by the morphology and distribution of the NiO phase. The zero-dimensional mesoporous sphere NiO shows the largest specific capacitance of 1329 F g(-1) as well as a good cycle life during 1000 cycles in a 1 M KOH electrolyte at a very high current density of 84 A g(-1) by chronopotentiometry measurement. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3425624] All rights reserved.
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