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Abstract
WO3-TiO2 nanotube films on pure titanium substrates were successfully fabricated by one-step electrochemical anodizing and copper deposited on these nanotubes by photo-assisted deposition method. The morphology, structure and composition of synthesized films were characterized by SEM, XRD, EDX and UV-vis, respectively. Results showed that the films have the ordered nanotubes with average pore diameter of 70–100 nm and wall thickness of 20–25 nm. Diffuse reflectance spectra showed an increase in the visible absorption relative to bare WO3-TiO2 nanotubes. Photocatalytic activity of samples was evaluated by testing the solar water splitting. After irradiated under xenon light illumination for 360 min, the total amount of H2 evolved on the Cu/WO3-TiO2 sample was 55 mL/cm2, which is approximately 6.9 times higher than that on the bare WO3-TiO2 (8 mL/cm2). The catalysts prepared in this study exhibit industrially relevant interests due to the low cost and high photocatalytic activity.