Humidity-tolerant porous polymer coating for passive daytime radiative cooling

Dongpyo Hong, Yong Joon Lee, Ok Sung Jeon, In-Sung Lee, Se Hun Lee, Jae Yeon Won, Young Pyo Jeon, Yunju La, Seonmyeong Kim, Gun-Sik Park, Young Joon Yoo () and Sang Yoon Park ()
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Dongpyo Hong: Seoul National University
Yong Joon Lee: Ltd.
Ok Sung Jeon: Seoul National University
In-Sung Lee: Seoul National University
Se Hun Lee: Seoul National University
Jae Yeon Won: Kyounggi University
Young Pyo Jeon: Seoul National University
Yunju La: Seoul National University
Seonmyeong Kim: Seoul National University
Gun-Sik Park: Seoul National University
Young Joon Yoo: Seoul National University
Sang Yoon Park: Seoul National University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Coating building envelopes with a passive daytime radiative cooling (PDRC) material has attracted enormous attention as an alternative cooling technique with minimal energy consumption and carbon footprint. Despite the exceptional performance and scalability of porous polymer coating (PPC), achieving consistent performance over a wide range of drying environments remains a major challenge for its commercialization as a radiative cooling paint. Herein, we demonstrate the humidity vulnerability of PPC during the drying process and propose a simple strategy to greatly mitigate the issue. Specifically, we find that the solar reflectance of the PPC rapidly decreases with increasing humidity from 30% RH, and the PPC completely losses its PDRC ability at 45% RH and even become a solar-heating material at higher humidity. However, by adding a small amount of polymer reinforcement to the PPC, it maintains its PDRC performance up to 60% RH, resulting in a 950% increase in estimated areal coverage compared to PPC in the United States. This study sheds light on a crucial consistency issue that has thus far been rarely addressed, and offers engineering guidance to handle this fundamental threat to the development of dependable PDRC paint for industrial applications.

Date: 2024
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DOI: 10.1038/s41467-024-48621-6

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