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

Journal Article


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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 mF cm2, 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.

Publication Date


  • 2011

Citation


  • Salari, M., Konstantinov, K. K. & Liu, H. K. (2011). Enhancement of the capacitance in TiO2 nanotubes through controlled introduction of oxygen vacancies. Journal of Materials Chemistry, 21 (13), 5128-5133.

Scopus Eid


  • 2-s2.0-79952748092

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=7004&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4073

Number Of Pages


  • 5

Start Page


  • 5128

End Page


  • 5133

Volume


  • 21

Issue


  • 13

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 mF cm2, 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.

Publication Date


  • 2011

Citation


  • Salari, M., Konstantinov, K. K. & Liu, H. K. (2011). Enhancement of the capacitance in TiO2 nanotubes through controlled introduction of oxygen vacancies. Journal of Materials Chemistry, 21 (13), 5128-5133.

Scopus Eid


  • 2-s2.0-79952748092

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=7004&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4073

Number Of Pages


  • 5

Start Page


  • 5128

End Page


  • 5133

Volume


  • 21

Issue


  • 13