Abstract
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Here, we report the fabrication of self-organized titania (TiO2) nanotube array supercapacitor
electrodes through controlled phase transformation of TiO2, with aerial capacitances as high as
2.6 mF cm-2, which far exceeds the values so far reported in the literature. The role of phase
transformation in the electrochemical charge–discharge behaviour of nanocrystalline TiO2
nanotubes is investigated and discussed in detail. The ease of synthesis and the exceptional
electrochemical properties make these nanotube arrays an alternative candidate for use in energy
storage devices