WO3 films are widely used in electrochromic devices owing to their high optical modulation and environmental stability. However, their practical application is hindered by sluggish redox kinetics and the ion trapping effect, leading to slow switching speeds and reduced cycling stability. To address these issues, we incorporated two-dimensional layered Ti3C2Tx (T = –O,
F, and –OH), known for its high conductivity, and WO3·2H2O nanosheets to form a composite film with dual functionalities of electrochromism and infrared stealth. The optimized WO3·2H2O/Ti3C2Tx composite film exhibits a significantly improved optical modulation of 58.0 % at 700 nm), rapid switching speeds (colored/bleached times, 9.2 s/1.6 s), and enhanced cycling stability (decay of 30.1/18.2 % in insertion/extraction charge density after 3000 s of cycling). These improvements originate from the synergistic effect of Ti3C2Tx and the crystalline water within the WO3·2H2O nanosheets. Together, they promote Li+ ion participation in redox reactions, accelerate the reaction kinetics, and reduce the ion trap effect in WO3 through reduced charge transfer resistance. Additionally, the incorporation of low-infrared-emissivity Ti3C2Tx provide a measurable 3.4 °C temperature shielding effect in colored state, further enhancing the composite film's infrared stealth performance. Owing to these advantages, the WO3·2H2O/Ti3C2Tx composite film shows great promise for applications in smart windows and thermal camouflage.
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