Journal
NANO ENERGY
Volume 11, Issue -, Pages 211-218Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2014.09.030
Keywords
Carbon nanotube; Nanocomposite; Supercapacitor; Asymmetric supercapacitor; Nickel hydroxide
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Funding
- Canon Foundation
- Japan Society for the Promotion of Science (JSPS KAKENHI) [26708028]
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Coaxial carbon nanotube-nickel hydroxide (CNT/Ni(OH)(2)) composites are prepared by a simple, one step and inexpensive chemical coprecipitation method. The coaxial coating of nickel hydroxide provides a three dimensional (3D) structure for easy access of electrolyte. Asymmetric supercapacitors (ASCs) are fabricated using coaxial CNT/Ni(OH)(2) composites as positive electrode and reduced graphene oxide (rGO) as negative electrode. The operation voltage is expanded to 1.8 V in spite of the use of aqueous electrolyte, revealing a high energy density of 35 W.h kg(-1) at a power density of 1.8 kW.kg(-1). This strategy for choice of coaxial metal hydroxide CNT composites provides a promising route for next generation supercapacitors with high energy as well as power densities. (C) 2014 Elsevier Ltd. All rights reserved.
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