Modification of capacitive charge storage of TiO2 with nickel doping
| Autor: | Rajan Jose, Arunava Gupta, V. Manikantan Nair, Baiju Vidyadharan, Syam G. Krishnan, Bincy Lathakumary Vijayan, Izan Izwan Misnon, Panikar Sathyaseelan Archana |
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| Rok vydání: | 2016 |
| Předmět: |
Supercapacitor
Materials science Mechanical Engineering Doping Metals and Alloys chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance 0104 chemical sciences Dielectric spectroscopy Nickel chemistry Chemical engineering Mechanics of Materials Electrode Materials Chemistry Cyclic voltammetry 0210 nano-technology Faraday efficiency |
| Zdroj: | Journal of Alloys and Compounds. 684:328-334 |
| ISSN: | 0925-8388 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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