Unknown

Dataset Information

0

Photocatalysis and photoelectrochemical properties of tungsten trioxide nanostructured films.


ABSTRACT: Tungsten trioxide (WO₃) possesses a small band gap energy of 2.4-2.8 eV and is responsive to both ultraviolet and visible light irradiation including strong absorption of the solar spectrum and stable physicochemical properties. Thus, controlled growth of one-dimensional (1D) WO₃ nanotubular structures with desired length, diameter, and wall thickness has gained significant interest. In the present study, 1D WO₃ nanotubes were successfully synthesized via electrochemical anodization of tungsten (W) foil in an electrolyte composed of 1 M of sodium sulphate (Na₂SO₄) and ammonium fluoride (NH₄F). The influence of NH₄F content on the formation mechanism of anodic WO₃ nanotubular structure was investigated in detail. An optimization of fluoride ions played a critical role in controlling the chemical dissolution reaction in the interface of W/WO₃. Based on the results obtained, a minimum of 0.7 wt% of NH₄F content was required for completing transformation from W foil to WO₃ nanotubular structure with an average diameter of 85 nm and length of 250 nm within 15 min of anodization time. In this case, high aspect ratio of WO₃ nanotubular structure is preferred because larger active surface area will be provided for better photocatalytic and photoelectrochemical (PEC) reactions.

SUBMITTER: Lai CW 

PROVIDER: S-EPMC3980788 | biostudies-other | 2014

REPOSITORIES: biostudies-other

Similar Datasets

| S-EPMC8224280 | biostudies-literature
| S-EPMC5132158 | biostudies-literature
| S-EPMC7023535 | biostudies-literature
| S-EPMC3880857 | biostudies-literature
| S-EPMC6299045 | biostudies-literature
| S-EPMC5643310 | biostudies-literature
| S-EPMC6808203 | biostudies-literature
| S-EPMC7481689 | biostudies-literature
| S-EPMC5916887 | biostudies-other
| S-EPMC6271203 | biostudies-literature