Modification of Capacitive Charge Storage of TiO2 with Nickel Doping

Krishnan, Syam G. and Archana, P. S. and Vidyadharan, Baiju and Izan Izwan, Misnon and Vijayan, Bincy Lathakumary and Nair, V. Manikantan and Gupta, Arunava and Rajan, Jose (2016) Modification of Capacitive Charge Storage of TiO2 with Nickel Doping. Journal of Alloys and Compounds, 684. pp. 328-334. ISSN 0925-8388 (print); 1873-4669 (online). (Published)

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For practical deployment of supercapacitors characterized by high energy density, power density and long cycle life, they must be realized using low cost and environmentally benign materials. Titanium dioxide (TiO2) is largely abundant in the earth's crust; however, they show inferior supercapacitive electrochemical properties in most electrolytes for practical deployment. In this paper, we show that nickel doped TiO2 (Ni:TiO2) nanowires developed by electrospinning showed five times larger capacitance (∼200 F g−1) than the undoped analogue (∼40 F g−1). Electrochemical measurements show that the Ni:TiO2 nanowires have 100% coulombic efficiency. The electrodes showed no appreciable capacitance degradation for over 5000 cycles. The superior charge storage capability of the Ni:TiO2 could be due to its high electrical conductivity that resulted in five orders of magnitude higher ion diffusion as determined by cyclic voltammetry and electrochemical impedance spectroscopy measurements.

Item Type: Article
Uncontrolled Keywords: Ceramic nanostructures; Renewable energy; Batteries; TiO2 nanostructures; One-dimensional nanostructures
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 18 Dec 2014 02:29
Last Modified: 08 Feb 2018 03:20
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