Nickel oxide coated on ultrasonically pretreated carbon nanotubes for supercapacitor |
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Authors: | Bo Gao Chang-zhou Yuan Lin-hao Su Li Chen Xiao-gang Zhang |
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Institution: | (1) College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China |
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Abstract: | Nickel oxide/carbon nanotubes (NiO/CNTs) composite materials for supercapacitor are prepared by chemically depositing nickel
hydroxide onto carbon nanotubes pretreated by ultrasonication and followed by thermal annealing at 300 °C. A series of NiO/CNTs
composites with different weight ratios of nickel oxide versus carbon nanotubes are synthesized via the same route. The high-resolution
TEM and SEM results show that a lot of nicks, which favored the nucleation of the nickel hydroxide formed on the outer walls
of carbon nanotubes due to ultrasonic cavitations, and then nickel oxide coated uniformly on the outer surface of the individual
carbon nanotubes. The NiO/CNTs electrode presents a maximum specific capacitance of 523 F/g as well as a good cycle life during
1,000 cycles in 6 M KOH electrolyte. The good electrochemical characteristics of NiO/CNTs composite can be attributed to the
three-dimensionally interconnected nanotubular structure with a thin film of electroactive materials. |
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Keywords: | Carbon nanotubes Nickel oxide Supercapacitor Ultrasonic cavitations |
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