Journal
CHEMICAL ENGINEERING JOURNAL
Volume 442, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136239
Keywords
Radiative cooling; Superhydrophobic; Self-cleaning; Energy-saving
Categories
Funding
- Key Research and Development Pro-gram of Shaanxi Province [2020ZDLGY13-11]
- National Natural Science Foundation of China [51572161, 22075046]
- Natural Science Funds for Distinguished Young Scholar of Fujian Province [2020 J06038]
- Major Project of Ministry of Science and Technology of China [2017YFB0307700]
- Natural Science Foundation of Fujian Province [2019 J01256]
- Natural Science Foundation of Shaanxi Province [2020JM-506]
- Major Project of Scientific Research in Shaanxi Province [2020ZDLGY13-11]
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This study fabricates a hierarchically structured PVDF/PDMS porous film that integrates strong sunlight reflectance, high thermal-infrared emittance, and robust super hydrophobicity, achieving a sub-ambient temperature drop under strong sunlight and maintaining long-term radiative cooling performance through self-cleaning.
Radiative cooling without using electricity represents an ideal green solution for air-conditioning. Despite exciting progress made so far, most of the radiative cooling materials are vulnerable to outdoor contamination, which leads to decreased performance. Herein, we fabricate a hierarchically structured PVDF/PDMS porous film which integrates strong sunlight reflectance (97%), high thermal-infrared emittance (96%) and robust super hydrophobicity (160.2). The synergy of the effective solar reflection and thermal-infrared emission enables the film to yield a sub-ambient temperature drop of 12.3 degrees C under strong sunlight. More importantly, the super hydrophobicity keeps the film away from contamination by self-cleaning, maintaining well the radiative cooling performance for a long-term outdoor use. Additionally, the as-obtained film shows excellent chemical durability after exposure to different pH solutions and UV light irradiation. This work provides a new strategy to integrate self-cleaning with radiative cooling, showing great potential to advance energy-free cooling materials toward real-world applications.
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