Effortlessly Crafted, Superior Quality, and Mass-Producible Coatings Combining Backscattering and Surface Scattering for Passive Daytime Radiative Cooling

作者：Yuxuan Gu, YueKe Wang, Yiren Cao, Wei Wei, Xiaojie Li, Jingcheng Liu · 发表于：ACS Applied Materials & Interfaces · 年份：2025 · DOI：10.1021/acsami.5c00229 · 被引用次数：9 · 研究领域：Thermal Radiation and Cooling Technologies、Urban Heat Island Mitigation、Building Energy and Comfort Optimization

Passive daytime radiative cooling (PDRC) stands out as an eco-friendly, energy-independent cooling solution, which has emerged as a field of intense interest and extensive investigation. In this work, a low-thickness PDRC coating with an average solar reflectance of 93.7% and an average long-wave infrared emittance of 98.5% was developed by combining the backscattering of hollow silica microspheres (HSMs) with the surface scattering of TiO 2 . A finite element method simulation was conducted to verify that the HSMs enhance the backscattering performances. The synergistic interaction between the two fillers optimized their performance, leading to a high work efficiency and a significant reduction in the filler loading. Moreover, the coating demonstrated outstanding cooling performance in both indoor and outdoor tests. Under summer temperatures exceeding 38.9 °C, the temperatures of a wooden house model and a concrete slab were reduced by 5.0 and 6.3 °C, respectively. The coating featured simple industrial preparation, low cost, and the ability to produce in large volumes, thereby providing a viable path toward commercial and industrial scalability. This work offers a viable solution to the current challenges faced in the application of PDRC coatings.