Citation: Qian Wu, Yubo Cui, Guifeng Xia, Jinlong Yang, Shuming Du, Xinhong Xiong, Li Yang, Dong Xu, Xu Deng, Jiaxi Cui. Passive daytime radiative cooling coatings with renewable self-cleaning functions[J]. Chinese Chemical Letters, ;2024, 35(2): 108687. doi: 10.1016/j.cclet.2023.108687 shu

Passive daytime radiative cooling coatings with renewable self-cleaning functions

Qian Wu ^a ,
Yubo Cui ^{a, b} ,
Guifeng Xia ^{a, b} ,
Jinlong Yang ^a ,
Shuming Du ^c ,
Xinhong Xiong ^b ,
Li Yang ^d ,
Dong Xu ^c ,
Xu Deng ^a ,
Jiaxi Cui ^{a, b, *,}

a.
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
b.
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China
c.
Beijing Key Laboratory of Power Generation System Functional Material, CHN Energy New Energy Technology Research Institute Ltd., Beijing 102209, China
d.
Institute for Advanced Study, Chengdu University, Chengdu 610106, China

jiaxi.cui@uestc.edu.cn

Received Date: 3 April 2023
Revised Date: 8 June 2023
Accepted Date: 11 June 2023
Available Online: 15 June 2023

Figures(4)

Passive daytime radiative cooling (PDRC) technology is emerging as one of the most promising solutions to the global problem of spacing cooling, but its practical application is limited due to reduced cooling effectiveness caused by daily wear and tear, as well as dirt contamination. To tackle this problem, we report a novel strategy by introducing a renewable armor structure for prolonging the anti-fouling and cooling effectiveness properties of the PDRC coatings. The armor structure is designed by decorating fluorinated hollow glass microspheres (HGM) inside rigid resin composite matrices. The HGM serve triple purposes, including providing isolated cavities for enhanced solar reflectance, reinforcing the matrices to form robust armored structures, and increasing thermal emittance. When the coatings are worn, the HGM on the surface expose their concave cavities with numerous hydrophobic fragments, generating a highly rough surface that guarantee the superhydrophobic function. The coatings show a high sunlight reflectance (0.93) and thermal emittance (0.94) in the long-wave infrared window, leading to a cooling of 5 ℃ below ambient temperature under high solar flux (~900 W/m²). When anti-fouling functions are reduced, they can be regenerated more than 100 cycles without compromising the PDRC function by simple wearing treatment. Furthermore, these coatings can be easily prepared using a one-pot spray method with low-cost materials, exhibit strong adhesion to a variety of substrates, and demonstrate exceptional environmental stability. Therefore, we anticipate their immediate application opportunities for spacing cooling.
- Superhydrophobic,
- Passive radiative cooling,
- Wearing,
- Regeneration,
- Glass resin armor
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