Marichi, Ram Bhagat and Sahu, Vikrant and Lalwani, Shubra and Mishra, Monu and Gupta, Govind and Sharma, Raj Kishore and Singh, Gurmeet (2016) Nickel-shell assisted growth of nickel-cobalt hydroxide nanofibres and their symmetric/asymmetric supercapacitive characteristics. Journal of Power Sources , 325. 762-771 . ISSN 0378-7753

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Abstract

Using polyurethane foam as template, we introduce a facile method to synthesize cost-effective macroporous nickel-shell (NS) which plays vital role in the synthesis of alpha-Ni-Co(OH)(2). Nanofibrous morphology of alpha-Ni-Co(OH)(2) is obtained by the aid of polyethylene glycol (structure directing reagent) and no precipitating agent is used. Our results indicate that no metal (Ni/Co) hydroxides can be synthesized if NS is isolated from the reaction vessel which ensures the role of NS in formation of alpha-Ni-Co(OH)(2) nanofibres. Prepared alpha-Ni-Co(OH)(2)@NS electrode shows a typical enhanced interlayer spacing (similar to 8.0 angstrom) which results in significantly high specific capacitance (2962 F g(-1) at 5 mV s(-1)). Furthermore, the symmetric supercapacitor cell (alpha-Ni-Co(OH)(2)@NS parallel to alpha-Ni-Co(OH)(2)@NS) exhibits a maximum specific capacitance of 668 F g(-1) with coulombic efficiency similar to 98% over 3000 charge/discharge cycles at high current density (4 A g(-1)). The energy and power density obtained for alpha-Ni-Co(OH)(2)@NS parallel to alpha-NiCo(OH)(2)@NS cell are 18.2 Wh kg(-1) at 242 W kg(-1) and 1980 W kg(-1) at 5.5 Wh kg(-1) respectively. Moreover, in asymmetric supercapacitor using lacey reduced graphene oxide nanoribbon (LRGONR) as a negative electrode, a remarkable increase in energy (107 Wh kg(-1) at 1610 W kg(-1)) and power density (7 kW kg(-1) at 42 Wh kg(-1)) is observed.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Uncontrolled Keywords:	Nickel-cobalt hydroxide Nickel-shell Hydrothermal synthesis Graphene nanoribbon Asymmetric supercapacitor
Subjects:	Chemistry > Physical Chemistry Electrochemistry Energy Fuels Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	07 Mar 2018 06:55
Last Modified:	07 Mar 2018 06:55
URI:	http://npl.csircentral.net/id/eprint/2302

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