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Daytime radiative cooling has attracted considerable attention recently dueto its tremendous potential for passively exploiting the coldness of deep-skyas clean and renewable energy. Many advanced materials with novel photonicmicro-nanostructures have already been developed to enable highly efficientdaytime radiative coolers, among which the flexible hierarchical porouscoatings (HPCs) are a more distinguished category. However, it is still hard toprecisely control the size distribution of the randomized pores within theHPCs, usually resulting in a deficient solar reflection at the near-infraredoptical regime under diverse fabrication conditions of the coatings. We reporthere a three-phase (i.e., air pore-phase, microsphere-phase and polymer-phase)self-assembled hybrid porous composite coating which dramatically increases theaverage solar reflectance and yields a remarkable temperature drop of ~10 degCand 30 degC compared to the ambient circumstance and black paint, respectively,according to the rooftop measurements. Mie theory and Monte Carlo simulationsreveal the origin of the low reflectivity of as-prepared two-phase porous HPCs,and the optical cooling improvement of the three-phase porous compositecoatings is attributed to the newly generated interfaces possessing the highscattering efficiency between the hierarchical pores and silica microsphereshybridized with appropriate mass fractions. As a result, the hybrid porouscomposite approach enhances the whole performance of the coatings, whichprovides a promising alternative to the flexible daytime radiative cooler.

Flexible daytime radiative cooling enhanced by enabling three-phase  composites with scattering interfaces between silica-microspheres and  hierarchical porous coatings