Issue 67, 2016

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

Abstract

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
02 May 2016
Accepted
20 Jun 2016
First published
22 Jun 2016
This article is Open Access
Creative Commons BY license

RSC Adv., 2016,6, 62218-62225

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

R. S. Devan, Y. Ma, R. A. Patil and S. Lukas, RSC Adv., 2016, 6, 62218 DOI: 10.1039/C6RA11348F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements