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Issue 13, 2011
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Enhancement of the capacitance in TiO2nanotubes through controlled introduction of oxygen vacancies

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Abstract

The many applications of high energy storage devices have forged an increasing interest in research areas related to electrochemical capacitors. Here, in this work, we present a facile method for the fabrication of self-organized titania nanotubes grown by anodic oxidation of titanium foil with different subsequent heat-treatment regimes for use as binder-free working electrodes in supercapacitor applications. The capacitance of these highly ordered titania nanotubes, when exposed to a reductive atmosphere during annealing, was determined to be well above 900 µF cm−2, confirming that the capacitance contribution was pseudocapacitive in nature. The behaviour of oxygen depleted titania in the anatase to rutile (A → R) phase transformation and also in electrochemical charge storage has been studied in detail. It was found that upon the reduction of Ti4+ to Ti3+, with oxygen depletion of the structure, the A → R phase transformation was promoted. In addition, the fabricated electrodes showed highly reversible charge–discharge stability.

Graphical abstract: Enhancement of the capacitance in TiO2 nanotubes through controlled introduction of oxygen vacancies

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Publication details

The article was received on 25 Nov 2010, accepted on 02 Feb 2011 and first published on 22 Feb 2011


Article type: Paper
DOI: 10.1039/C0JM04085A
J. Mater. Chem., 2011,21, 5128-5133

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    Enhancement of the capacitance in TiO2 nanotubes through controlled introduction of oxygen vacancies

    M. Salari, K. Konstantinov and H. K. Liu, J. Mater. Chem., 2011, 21, 5128
    DOI: 10.1039/C0JM04085A

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