Pramanik, Atin and Maiti, Sandipan and Sreemany, Monjoy and Mahanty, Sourindra (2016) High electrochemical energy storage in self-assembled nest-like CoO nanofibers with long cycle life. Journal of Nanoparticle Research, 18 (4). Art No-93. ISSN 1388-0764

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Developing efficient electrode material is essential to keep pace with the demand for high energy density together with high power density and long cycle life in next generation energy storage devices. Herein, we report the electrochemical properties of hydrothermally synthesized CoO nanofibers of diameter 30-80 nm assembled in a nest-like morphology which showed a very high reversible lithium storage capacity of 2000 mA h g(-1) after 600 cycles at 0.1 mA cm(-2) as lithium-ion battery anode. Systematic investigation by ex situ transmission electron microscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, and impedance spectroscopy at different cycling stages indicated that the extraordinary performance could be related to an enhancement in the Co2+<-> Cox+(2 < x <= 3) redox process in addition to the commonly believed structural and morphological evolution during cycling favoring generation of large number of accessible active sites for lithium insertion. Further, when examined as a supercapacitor electrode in 1.0 M KOH, a capacitance of 1167 F g(-1) is achieved from these 1D CoO nanofibers after 10,000 charge discharge cycles at a high current density of 5 A g(-1) demonstrating good application potential.

Item Type: Article
Subjects: Electronics
Divisions: Fuel Cell and Battery
Depositing User: Bidhan Chaudhuri
Date Deposited: 08 Nov 2016 11:00
Last Modified: 29 Mar 2017 09:50

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