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tungsten vi oxide, also known as tungstic anhydride, has the chemical formula WO3. It is an oxidation product of tungsten and oxygen, and occurs naturally in the form of tungstite, meymacite, and hydrotungstite minerals. It is used to manufacture tungstates, x-ray screen phosphors, fireproofing fabrics and gas sensors. Tungsten oxide is insoluble in water and very slightly soluble in HF. It is a white solid and is odorless. It is a key raw material in the production of optical materials such as laser diodes, electrochromic windows, and spectrographic filters.
WO3 is also used as an electrocatalyst for water splitting reactions and hydrogen evolution. It is a highly efficient visible light-responsive photocatalyst, but has low photoactivity for organic pollutants, due to the high rate of electron-hole recombination. [74, 75] To enhance the performance of WO3 for organic pollutants degradation, the structure and composition of WO3 film are important factors to consider.
The authors fabricated a mesostructured WO3 film with perpendicularly oriented, plate-like crystallites on an alumina substrate using the controlled anisotropic growth of tungsten oxide hydrate (WO3*H2O) on a glassy surface. The resulting WO3 film has enhanced visibility-responsiveness, and improved photocatalytic activity for the degradation of naphthol blue black dye, compared with pure WO3. This is mainly because of reduced surface recombination and hole-electron transfer rates. This work demonstrates the potential of mesoporous tungsten oxide films for chemical and environmental applications.