Highly stable supercapacitive performance of one-dimensional (1D) brookite TiO2 nanoneedles
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Date
2016
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Royal Society of Chemistry
Abstract
We report the highly stable supercapacitive performance of one-dimensional (1D) nanoneedles of brookite (?) TiO2 synthesized on a conducting glass substrate. The 1D ?-TiO2 nanoneedles synthesized over a large area array utilizing hot-filament metal vapor deposition (HFMVD) were ?24-26 nm wide, ?650 nm long and tapered in a downward direction. X-ray photoemission spectroscopy (XPS) revealed their chemical properties and stoichiometric Ti and O composition. The 1D ?-TiO2 nanoneedles execute as parallel units for charge storage, yielding a specific capacitance of 34.1 mF g-1. Electrochemical impedance spectroscopy revealed that the large surface area and brookite crystalline nature of the 1D nanoneedles provided easy access to Na+ ions, and resulted in low diffusion resistance, playing a key role in their stable charging-discharging electrochemical mechanism. Moreover, the non-faradic mechanism of these nanoneedles delivered better durability and high stability up to 10000 cycles, and a columbic efficiency of 98%. Therefore, 1D ?-TiO2 nanoneedles hold potential as an electrode material for highly stable supercapacitive performance with long cycle lifetime. ? 2016 The Royal Society of Chemistry.
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Keywords
Capacitance, Electrochemical impedance spectroscopy, Nanoneedles, Photoelectron spectroscopy, Substrates, Titanium, Columbic efficiency, Crystalline nature, Diffusion resistance, Electrochemical mechanisms, Electrode material, Large surface area, Specific capacitance, X ray photoemission spectroscopy, Titanium dioxide
Citation
Devan, R. S., Ma, Y. R., Patil, R. A., & Lukas, S. M. (2016). Highly stable supercapacitive performance of one-dimensional (1D) brookite TiO<inf>2</inf>nanoneedles. Rsc Advances, 6(67), 6218-6225. doi: 10.1039/c6ra11348f