Abstract
Ordered TiO2 nanotube arrays can be prepared by anodizing of Ti metal. However, the nanotubular TiO2 structure shows a lack of reproducibility when the Ti metal is repetitively anodized in a, prepared solution. The TiO2 tube length increases as the number of anodizations increases. In this work, the effects of the solution conductivity and temperature on the formation of the nanotubular TiO2 structure were analyzed using the measured current transients and tube morphology. Nanotubular TiO2 was tested as an anode for a dye-sensitized solar Cell and its performance was interpreted using electrochemical impedance spectroscopy in relation to a morphological study of the TiO2 structure.