As a photocatalyst, yellow tungsten oxide (WO3) has significant volume effects, surface effects, quantum size effects, and macro quantum tunnel effects, so that it has a wide range of applications in environmental pollution purification and energy regeneration, and therefore it has attracted much attention. Compared with commonly used photocatalysts such as TiO2 and ZnO, yellow tungsten oxide has a smaller forbidden band width and a larger light absorption range, thus it can use visible light (accounting for nearly half of the solar radiation energy) more effectively.
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Moreover, the preparation process of WO3 is simple. The band gap energy of WO3 is small (about 2.5eV). And it can absorb visible light with a wavelength less than 480nm. However, it is difficult to obtain stable photocatalytic performance for pure WO3 due to its defects such as easy photocorrosion and low utilization of visible light. Therefore, how to improve the photocatalytic degradation performance of WO3 is of great significance. Studies have shown that doping and other technologies are beneficial to improve the photocatalytic activity of WO3.
