Highly stable supercapacitive performance of one-dimensional (1D) brookite TiO2 nanoneedles

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2016
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Devan, Rupesh S.
Ma, Yuan-Ron
Patil, Ranjit A.
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http://nbn-resolving.de/urn:nbn:de:bsz:352-0-371974
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https://doi.org/10.1039/c6ra11348f
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RSC Advances. 2016, 6(67), pp. 62218-62225. eISSN 2046-2069. Available under: doi: 10.1039/c6ra11348f
Zusammenfassung

We report the highly stable supercapacitive performance of one-dimensional (1D) nanoneedles of brookite (β) TiO2 synthesized on a conducting glass substrate. The 1D β-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 β-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 10 000 cycles, and a columbic efficiency of 98%. Therefore, 1D β-TiO2 nanoneedles hold potential as an electrode material for highly stable supercapacitive performance with long cycle lifetime.

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530 Physik
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supercapacitor, one-dimensional, nanoneedles, stability, titanium dioxide
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ISO 690DEVAN, Rupesh S., Yuan-Ron MA, Ranjit A. PATIL, Lukas SCHMIDT-MENDE, 2016. Highly stable supercapacitive performance of one-dimensional (1D) brookite TiO2 nanoneedles. In: RSC Advances. 2016, 6(67), pp. 62218-62225. eISSN 2046-2069. Available under: doi: 10.1039/c6ra11348f
BibTex
@article{Devan2016Highl-35962,
  year={2016},
  doi={10.1039/c6ra11348f},
  title={Highly stable supercapacitive performance of one-dimensional (1D) brookite TiO<sub>2</sub> nanoneedles},
  number={67},
  volume={6},
  journal={RSC Advances},
  pages={62218--62225},
  author={Devan, Rupesh S. and Ma, Yuan-Ron and Patil, Ranjit A. and Schmidt-Mende, Lukas}
}
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