香港城市大学Chi Yan Tso团队报道了具有高太阳反射率的多级结构被动辐射冷却陶瓷。相关研究成果发表在2023年11月10日出版的国际学术期刊《科学》。

使用纳米光子结构的被动辐射冷却由于其高成本，和与现有最终用途的兼容性差而受到限制，而聚合物光子替代品缺乏耐候性和有效的太阳反射。

研究人员开发了一种多孔陶瓷，它可以实现高效的光散射和99.6%的近乎完美的太阳反射率。这些品质加上高的热发射率，使陶瓷能够在户外环境中提供连续的亚环境冷却，中午的冷却功率超过130瓦/平方米，在全球范围内展示了节能潜力。颜色、耐候性、机械坚固性和抑制Leidenfrost效应的能力，是确保冷却陶瓷耐用和通用性的关键特征，从而促进了其在各种应用中的商业化，特别是在建筑施工中。

附：英文原文

Title: Hierarchically structured passive radiative cooling ceramic with high solar reflectivity

Author: Kaixin Lin, Siru Chen, Yijun Zeng, Tsz Chung Ho, Yihao Zhu, Xiong Wang, Fayu Liu, Baoling Huang, Christopher Yu-Hang Chao, Zuankai Wang, Chi Yan Tso

Issue&Volume: 2023-11-10

Abstract: Passive radiative cooling using nanophotonic structures is limited by its high cost and poor compatibility with existing end uses, whereas polymeric photonic alternatives lack weather resistance and effective solar reflection. We developed a cellular ceramic that can achieve highly efficient light scattering and a near-perfect solar reflectivity of 99.6%. These qualities, coupled with high thermal emissivity, allow the ceramic to provide continuous subambient cooling in an outdoor setting with a cooling power of >130 watts per square meter at noon, demonstrating energy-saving potential on a worldwide scale. The color, weather resistance, mechanical robustness, and ability to depress the Leidenfrost effect are key features ensuring the durable and versatile nature of the cooling ceramic, thereby facilitating its commercialization in various applications, particularly building construction.

DOI: adi4725

Source: https://www.science.org/doi/10.1126/science.adi4725