Abstract
Platinum nanoparticles deposited on titanium dioxide–tungsten trioxide (Pt/TW) were prepared by one-step electrochemical anodizing and UV light photoreduction method. The characterizations of such prepared catalysts were studied by field emission scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. Diffuse reflectance spectra showed an increase in the visible absorption relative to bare TW nanotubes. Compared with the unmodified TW, Pt/TW samples exhibited obviously enhanced photocatalytic activity in the solar water splitting. After irradiated under xenon light illumination for 360 min, the total amount of H2 evolved on the Pt/TW sample was approximately 2.0 times higher than that on the bare TW and 8.0 times higher than that on the bare TiO2. Under irradiation, electron-hole pairs are formed on the Pt nanoparticles due to surface plasmon resonance and the introduction of Pt can form the Schottky barrier between TW and Pt nanoparticles which inhibit the photogen-erated charge carrier recombination and promoting the interfacial charge transfer.
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