Electrochemical characterization of TiO_2/WO_x nanotubes for photocatalytic application

TiO_2/WO_x nanotubes have unique photo-energy retention properties that have gathered scientific interest. Herein, we report the synthesis, morphological characterization, and the electrochemical characterization of TiO_2/WO_x nanotubes compared with pure TiO_2 nanotubes, prepared by anodization technique. Significant structural differences were not observed in TiO_2/WO_x nanotubes as observed by using scanning electron microscopy and transmission electron microscopy. The charge transfer resistance of TiO_2/WO_x before and after photo irradiation determined by using electrochemical impedance spectroscopy proves the inherent energy retention property which was not observed in pure TiO_2 nanotubes