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Various white MOF-based cryogels for passive daytime radiative cooling
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DOI：10.1039/d6nj00541a.png)
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Abstract
En 中文
Passive radiative cooling technology is a pressing need in contemporary society, yet it remains in its nascent stages, necessitating further research endeavors. In this study, a series of metal-organic framework (MOF)-based cryogels have been synthesized through the freeze-drying method. The presence of abundant pore structures and chemical bonds (such as C-O, C-H, C-N, P 00000000 00000000 00000000 00000000 11111111 00000000 11111111 00000000 00000000 00000000 O, Ti-O, and C-OH) endows these MOF-based cryogels with high solar reflectance values exceeding 90% and high mid-infrared emissivity levels surpassing 95%. These MOF-based cryogels can reduce the temperature by at least 10 degrees C and up to 15.1 degrees C under direct sunlight. Notably, the structures and optical properties of these MOF-based cryogels remain unchanged after being exposed to sunlight for 7 days and immersed in water for 30 days, indicating their good performance durability. Following accelerated ultraviolet aging and multiple freeze-thaw cycles, the cryogels' macroscopic appearances and microscopic morphologies remain intact, validating their exceptional weatherability. Furthermore, their recyclability and sustainable performance render them well-suited for applications as radiative cooling materials. The integration of MOFs and cryogels not only advances radiative cooling technology but also establishes a novel research platform for materials in this field.
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