Yellow tungsten oxide powder is an inorganic electrochromic material for preparing a smart window, which has the characteristics of high efficiency, energy conservation (heat insulation and heat preservation), and environmental protection, so it has a very attractive application prospect in energy-saving buildings.
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In foreign countries, some electrochromic windows have been mass-produced. For example, in 1986, a Japanese company first produced an electrochromic window for automobiles, making smart glass the first commercialized product of electrochromic materials. In 2002, Germany successfully developed a smart window using conductive polymers as electrochromic materials, and applied them to the glass windows of high-class cars such as Mercedes-Benz. In 2008, the electrochromic window produced by a US company was successfully used for the first time on the porthole of the Boeing 787 Dreamliner, replacing the traditional mechanical porthole sun visor. However, due to the high cost and complicated process of the product, the large-area smart windows used in buildings cannot be popularized.
