Tungsten trioxide, WO3, is a versatile inorganic compound. It appears as a yellow crystalline solid or powder. Key properties include semiconductor behavior and electrochromism, meaning it changes color reversibly under electrical charge. This makes it essential for smart windows that dynamically control light and heat. WO3 is also highly insoluble and stable under many conditions. Its photocatalytic activity is valuable for environmental applications like breaking down pollutants. WO3 effectively senses gases like nitrogen dioxide and ammonia, changing electrical resistance upon exposure, crucial for air quality monitors. Research explores WO3 in batteries, particularly cathodes for lithium-ion systems, and in photoelectrochemical cells for solar water splitting to produce hydrogen fuel. Nanostructured WO3 enhances surface area, boosting performance in sensing and catalysis. Future potential lies in optimizing nanostructures and composites for energy storage, conversion, and advanced electrochromic devices. Tungsten trioxide remains a key material for smart technologies and sustainable solutions.

(tungsten 6 oxide)

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