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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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Publication details

The article was received on 01 Dec 2008, accepted on 21 Jan 2009 and first published on 12 Feb 2009


Article type: Paper
DOI: 10.1039/B821532B
Energy Environ. Sci., 2009,2, 517-523

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    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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