Epitaxial Growth Route to Crystalline TiO2 Nanobelts with Optimizable Electrochemical Performance

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• 作者：Peng Gao ; Di Bao ; Ying Wang ; Yujin Chen ; Longqiang Wang ; Shaoqiang Yang ; Guorui Chen ; Guobao Li ; Yuzeng Sun ; Wei Qin
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：January 23, 2013
• 年：2013
• 卷：5
• 期：2
• 页码：368-373
• 全文大小：475K
• 年卷期：v.5,no.2(January 23, 2013)
• ISSN：1944-8252

文摘

Anatase TiO₂ nanobelts with 13 nm in thickness have been successfully synthesized via an epitaxial growth chemical transformation, in which the primary H₂Ti₃O₇ nanobelt frameworks can be preserved. The phases, crystal structures, morphologies, and growth behavior of both the precursory (Na₂Ti₃O₇ and H₂Ti₃O₇) and resultant products (TiO₂) are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). Detailed investigation of the formation mechanism of the TiO₂ nanobelts indicates epitaxial nucleation and oriented growth of textured TiO₂ inside the nanobelts. TiO₂ nanocrystals prefer certain epitaxial growth direction due to the structural matching of (110)_H2Ti3O7//(101)_TiO2. We demonstrated that the initial reversible capacity of these TiO₂ nanobelts attained 225 mA h/g. Furthermore, the nanobelts exhibit high power density along with excellent cycling stability in their application as hybrid electrochemical cells.

Keywords:

epitaxial growth; Anatase; H₂Ti₃O₇ nanobelts; TiO₂ nanobelts; electrochemical performance; lithium-ion batteries