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

被引:19
作者
Kim, Hyun Sik [1 ]
Yu, Seung-Ho [2 ,3 ]
Sung, Yung-Eun [2 ,3 ]
Kang, Soon Hyung [4 ]
机构
[1] Lotte Chem, Energy Mat Grp, Taejon 305726, South Korea
[2] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 151744, South Korea
[3] Seoul Natl Univ, Res Ctr Energy Convers & Storage, Seoul 151744, South Korea
[4] Chonnam Natl Univ, Dept Chem Educ, Kwangju 500757, South Korea
关键词
Li ion battery; Carbon doping; Titanium oxide nanotubes; Anodization; ELECTROCHEMICAL PERFORMANCE; NEGATIVE ELECTRODE; ANODE MATERIAL; ANATASE; STORAGE; INSERTION; TITANATE;
D O I
10.1016/j.jallcom.2014.02.013
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 mu m, respectively. The undoped (u-doped) TONT arrays possessing an anatase phase were again annealed at 500 degrees C under a mixed gas flux of nitrogen (N-2) 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. (C) 2014 Elsevier B. V. All rights reserved.
引用
收藏
页码:275 / 281
页数:7
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