We report the formation of WO3 doped TNT formed by a single-step anodization process in aqueous medium consisting of NH4F and a binary acid mixture consisting of phosphoric and tungstic acids. Preliminary results show the formation of nanotubes with diameters of 90-100 nm and average length of ~500 nm. XPS data shows tungsten loading of ~3 wt. % (W 4d peak). The diffuse reflectance spectra shows enhanced visible light absorbance compared to TNT prepared under similar conditions without tungstic acid with an indirect bandgap of ~2.6 eV. Enhanced photocurrent is also observed under 1.5 AM illumination in 0.1 M Na2SO4 electrolyte, with nearly double photocurrent density realized at 1.4 V (vs Ag/AgCl) for samples anodized in the presence of tungsten. The material demonstrates to be a promising candidate for photoelectrochemical water splitting. Further studies are underway to examine the roll of electrolyte composition and anodization conditions.

Formation of WO<sub>3</sub>-TiO<sub>2</sub> nanotubular composite via single-step anodization and its application in photoelectrochemical hydrogen generation

243rd National Meeting (2012)

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Formation of WO3-TiO2 nanotubular composite via single-step anodization and its application in photoelectrochemical hydrogen generation

Formation of WO₃-TiO₂ nanotubular composite via single-step anodization and its application in photoelectrochemical hydrogen generation