Design and scalable fabrication of core-shell nanospheres embedded spectrally selective single-layer coatings for durable daytime radiative cooling

辐射冷却 材料科学 被动冷却 白天 涂层 光电子学 发射率 透射率 红外窗口 辐射传输 光学 复合材料 热的 红外线的 气象学 物理 大气科学
作者
Yanmei Liu,Xiaohai Bu,Tianrui Yu,Xinxian Wang,Man He,Zewu Zhang,Mingxin Feng,Yuming Zhou
出处
期刊:Solar Energy Materials and Solar Cells [Elsevier]
卷期号:260: 112493-112493 被引量:3
标识
DOI:10.1016/j.solmat.2023.112493
摘要

Daytime radiative cooling (DRC) can spontaneously cool a surface without consuming energy by reflecting sunlight and emitting thermal radiation to the outer space through atmospheric transmission windows. However, the manufacturing of efficient DRC designs with low cost, high scalability, strong applicability, and along with achieving great weather resistance for practical applications remains a challenge. Here, we report a facile strategy to fabricate spectrally selective single-layer DRC coatings by facilely embedding hydrophobically modified TiO2@SiO2 nanospheres in commercially available fluorocarbon resin matrix for improving daytime cooling. The TiO2 shell thickness, pigments volume fraction, and coating thickness are optimized using finite difference time-domain (FDTD) simulation to maximize the sunlight scattering efficiency with minimal material usage. The coating prepared with a spaying time of 40 s reflects above 93% of solar irradiance and exhibits an infrared emissivity of ∼94% at atmospheric transmittance window wavelength, leading to a desirable daytime sub-ambient temperature drop of ∼10.9 °C. Building energy simulations demonstrates that 32.6% of cooling energy can be saved per year in China when the coating is used as building envelopes. The coatings also show improved scalability, peel strength, self-cleaning, and weather resistance, which makes them attractive candidates for long period outdoor DRC applications. This work paves a new way to design radiative cooling coatings with low cost and ease of application for the development of highly energy-efficient cooling technology.
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