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    A Highly Transparent Photo-Electro-Thermal Film with Broadband Selectivity for All-Day Anti-/De-Icing

    Year: 2023

    Journal: Small, Volume 19, 2023, page 2301723

    Authors: Lin, Chongjia; Ma, Wei; Zhang, Yinglun; Law, Man-Kwan; Li, Cruz Y.; Li, Yang; Chen, Zengshun; Li, Keqiao; Li, Meng; Zheng, Jiongzhi; Fu, Yunfei; Yan, Xiao; Chi, Cheng; Yang, Jinglei; Li, Weihong; Yao, Shuhuai; Huang, Baoling

    Keywords: super-hydrophobic; anti-/de-icing; photo-electro-thermal; transparent films

    A photo- and electro-thermal film can convert sunlight and electricity into heat to solve icing problems. Combination of them provides an efficient strategy for all-day anti-/de-icing. However, only opaque surfaces have been reported, due to the mutual exclusiveness between photon absorption and transmission. Herein, a highly transparent and scalable solution-processed photo-electro-thermal film is reported, which exhibits an ultra-broadband selective spectrum to separate the visible light from sunlight and a countertrend suppress of emission in longer wavelength. It absorbs ≈ 85% of invisible sunlight (ultraviolet and near-infrared) for light-heat conversion, meanwhile maintains luminous transmittance > 70%. The reflection of mid-infrared leads to low emissivity (0.41), which further preserves heat on the surface for anti-/de-icing purpose. This ultra-broadband selectivity enables temperature elevation > 40 °C under 1-sun illumination and the mutual support between photo-thermal and electro-thermal effects contributes to > 50% saving of electrical consumption under weak solar exposure (0.4-sun) for maintaining unfrozen surfaces at −35 °C environment. The reverberation from photo-electro-thermal and super-hydrophobic effects illustrates a lubricating removal of grown ice in short time (< 120 s). The self-cleaning ability and the durability under mechanical, electrical, optical, and thermal stresses render the film stable for long-term usage in all-day anti-/de-icing applications.
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