Tungsten oxide is a chemical compound made up of tungsten and oxygen, typically represented by the formula WO3. It is a yellowish powder that is used in various applications, including electronics, optics, and as a catalyst in chemical reactions. Its unique properties allow it to be used in smart windows, which can change color or transparency when an electric current is applied. In addition to its use in smart technologies, tungsten oxide is also explored for its potential in energy storage, particularly in lithium-ion batteries. Researchers are investigating its ability to improve battery performance and efficiency, making it a subject of interest in the field of renewable energy.