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Hydrothermally Grown Nanostructured Tungsten Trioxide (hydrate) Films and their Photocatalytic Properties

  • Z. H. Jiao (a1) and X.W. Sun (a2)

We report the growth of sheet-like nanostructured tungsten trioxide hydrate (3WO3·H2O) film on fluorine doped tin oxide (FTO) substrate via a facile crystal-seed-assisted hydrothermal method by using CH3COONH4 as capping agent. Dense thin film composed of irregular blocks with smaller surface area was obtained without the addition of CH3COONH4. X-ray diffraction (XRD) studies indicated that both films were of orthorhombic structure. The nanosheet film grown with CH3COONH4 after dehydration showed highly improved photocatalytic activities than the nanoblock one. The maximum anodic photocurrents of 1.16 mA/cm2 for oxidization of methanol and 0.5 mA/cm2 for water splitting were obtained for the nanosheet film with a highest photoconversion efficiency of about 0.3% under simulated solar illumination.

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