期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 13, 页码 5128-5133出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm04085a
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资金
- University of Wollongong
- Australian Research Council (ARC) [DP1093952]
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 mu F 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.
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