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Issue 5, 2009
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In situ studies of structural stability and proton conductivity of titanate nanotubes

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Abstract

Titanate nanotubes were prepared by hydrothermal treatment of anatase TiO2 with concentrated NaOH solution. In situsynchrotron X-ray diffraction studies revealed that the nanotubes are thermally unstable at temperatures above 360 °C and can transform directly to anatase via a dehydration and recrystallization process. This indicated that the titanate nanotubes possess an orthorhombic lepidocrocite (γ-FeOOH)-type layered structure. An aggregate of the as-prepared nanotubes showed an electric conductivity of about 1 × 10−6 S cm−1 at 50 °C in humid atmospheres. The conductivity depended on humidity of the atmosphere and decreased with increasing temperatures, suggesting that the proton conduction in the titanate nanotubes might correlate with the interlayer H3O+ ions.

Graphical abstract: In situ studies of structural stability and proton conductivity of titanate nanotubes

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Article information


Submitted
01 Dec 2008
Accepted
21 Jan 2009
First published
12 Feb 2009

Energy Environ. Sci., 2009,2, 517-523
Article type
Paper

In situ studies of structural stability and proton conductivity of titanate nanotubes

T. Gao, H. Fjeld, H. Fjellvåg, T. Norby and P. Norby, Energy Environ. Sci., 2009, 2, 517
DOI: 10.1039/B821532B

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