题目：Passive and Dynamic Phase-Change-Based Radiative Cooling in Outdoor Weather

作者：Xiudong Xu¹, Jinxin Gu², Haipeng Zhao¹, Xinyuan Zhang¹, Shuliang Dou³, Yao Li³, Jiupeng Zhao², Yaohui Zhan^1,*, and Xiaofeng Li^1,*

单位：

¹School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China

²School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China

³Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China

摘要：Radiative cooling has attracted considerable attention due to its tremendous potential in exploiting the cold reservoir of deep sky. However, overcooling always occurs in the conventional static radiative coolers because they operate only in the cooling mode in both hot and cold. Therefore, a dynamic radiative cooler based on phase change materials is highly desired. Nevertheless, the practical outdoor phase-change-based dynamic radiative cooling has not yet been experimentally demonstrated. To satisfy the stringent requirement of the phase-change-based radiative cooler in outdoor weather conditions, we engineered the phase-change material (VO2) to possess the room-temperature phase-transition capability for typical weather conditions. Second, the reconfigurable cavity consists of the lossless spacer to ensure the magnitude of thermal modulation and suppress the solar absorption simultaneously. Third, the practical selective-filtering method is devised to shield the solar irradiance while permitting the thermal emission. Our experiment demonstrates that these materials and photonic measures can work together to realize the dynamic radiative cooling in actual weather conditions, which shows a self-adaptive switch between the ON-cooling state in hot daytime and the OFF-cooling state in cold nighttime. The study pushes the radiative cooler toward multifunctionality and provides beneficial guidance for the phase-change-based intelligent thermal control.

关键词:passive cooling, dynamic radiative cooling, room-temperature phase transition, VO2, thermal emission, thermochromic film

影响因子：9.229

链接：https://doi.org/10.1021/acsami.1c23401