Used as a precursor in the production of tungsten metal, which is essential for manufacturing high-strength alloys and filaments in light bulbs. Commonly employed in gas sensors due to its sensitivity to reducing gases like hydrogen and carbon monoxide, as well as toxic gases such as nitrogen dioxide. Applied in electrochromic devices, such as smart windows, where it changes color in response to an electric current, helping control light and heat transmission. Also used as a durable coating material resistant to high temperatures and corrosion. Utilized as a pigment in ceramics and glass for producing yellow to orange colors. Investigated for use in photocatalytic water treatment, hydrogen production from water, and solar energy conversion due to its semiconductor properties.