Electrochromic smart devices with controllable optical properties are the most promising alternatives to traditional doors and windows. The existing technology preparation and commercialization of large-scale electrochromic films are mainly based on vapor deposition, but large-scale applications are limited by high prices (due to the complex preparation process).

Tungsten Trioxide (WO3), as a material with high gas sensitivity, high sensitivity and short response time, can be used as a gas sensor, and has been widely used in life and industry.

Electrochemical supercapacitors have become prominent energy storage devices due to their excellent capacitance behavior, unparalleled power and energy density, and excellent cycle stability.Tungsten trioxide (WO3) has the advantages of various shapes, high theoretical specific capacitance, environmental friendliness, and low cost. It is a promising electrode material. However, its low conductivity (10-5-10-6 S cm-1) limits its wide application. Doping or dispersing WO3 with highly conductive carbon materials is a solution to overcome these shortcomings.

In recent years, as a highly sensitive material, Tungsten Trioxide (WO3) has many advantages, such as short response and recovery time, appropriate response temperature, easy measurement and control, and low price. It can be used in the military and national defense fields, and has attracted people's concern.That's all thanks to its gas sensing property.