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

Hyun Sik Kim, Seung Ho Yu, Yung Eun Sung, Soon Hyung Kang

Research output: Contribution to journalArticle

15 Citations (Scopus)

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 μm, 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.

Original languageEnglish
Pages (from-to)275-281
Number of pages7
JournalJournal of Alloys and Compounds
Volume597
DOIs
Publication statusPublished - 2014 Jun 5

Keywords

  • Anodization
  • Carbon doping
  • Li ion battery
  • Titanium oxide nanotubes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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