Hierarchically structured passive radiative cooling ceramic with high solar reflectivity

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

doi:10.1126/science.adi4725

Author(s)

Xiong Wang
Fayu Liu
Baoling Huang
Christopher Yu-Hang Chao
Zuankai Wang
Chi Yan Tso

Related Research Unit(s)

Detail(s)

Original language	English
Pages (from-to)	691-697
Journal / Publication	Science
Volume	382
Issue number	6671
Online published	9 Nov 2023
Publication status	Published - 10 Nov 2023

Link(s)

DOI	DOI https://doi.org/10.1126/science.adi4725 Final Published version
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Attachment(s)	Documents 173367104.pdf Post-print, 368 KB, PDF Publisher's Copyright Statement This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on Volume 382, 10 November 2023, DOI: 10.1126/science.adi4725.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85176470923&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(70971ed3-18fe-4edf-a4c1-1ccba2641cb1).html

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 sub-ambient 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. Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.