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Carbon treated self-ordered TiO2 nanotube arrays with enhanced lithium-ion intercalation performance

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Title
Carbon treated self-ordered TiO2 nanotube arrays with enhanced lithium-ion intercalation performance
Author(s)
Kim, HS; Yu, SH; Yung Eun Sung; Kang, SH
Publication Date
2014-06
Journal
JOURNAL OF ALLOYS AND COMPOUNDS, v.597, no., pp.275 - 281
Publisher
ELSEVIER SCIENCE SA
Abstract
Vertically aligned TiO2 nanotube (TONT) arrays on titanium substrate developed by facile electrochemical anodization in an aqueous solution of 0.5 M Na2SO4, 0.5 M H3PO4, 0.2 M sodium citrate, and 0.5 wt% NaF were prepared having a pore diameter and thickness of 100 nm and 1.2 lm, respectively. The undoped (u-doped) TONT arrays possessing an anatase phase were again annealed at 500 C under a mixed gas flux of nitrogen (N2) and acetylene (C2H2), to induce the enhancement of electrical conductivity. It was designated as carbon-doped (c-doped) TONT arrays. Undoped and c-doped TONT arrays were compared using various characterization tools, including X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and X-ray photoelectron spectroscopy (XPS). Furthermore, based on several electrochemical tests (galvanostatic charge/discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS)), it was observed that c-doped TONT arrays revealed improved charge/discharge capacity, cycle stability, and rate capability, due to the enhanced electrical conductivity of c-doped TONT arrays. 2014 Elsevier B.V. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/1004
ISSN
0925-8388
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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