Wu Xueke, Li Jinlei, Xie Fei, Wu Xun-En, Zhao Siming, Jiang Qinyuan, Zhang Shiliang, Wang Baoshun, Li Yunrui, Gao Di, Li Run, Wang Fei, Huang Ya, Zhao Yanlong, Zhang Yingying, Li Wei, Zhu Jia, Zhang Rufan
Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, China.
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.
Nat Commun. 2024 Jan 27;15(1):815. doi: 10.1038/s41467-024-45095-4.
Radiative cooling is a zero-energy technology that enables subambient cooling by emitting heat into outer space (3 K) through the atmospheric transparent windows. However, existing designs typically focus only on the main atmospheric transparent window (8-13 μm) and ignore another window (16-25 μm), under-exploiting their cooling potential. Here, we show a dual-selective radiative cooling design based on a scalable thermal emitter, which exhibits selective emission in both atmospheric transparent windows and reflection in the remaining mid-infrared and solar wavebands. As a result, the dual-selective thermal emitter exhibits an ultrahigh subambient cooling capacity (9 °C) under strong sunlight, surpassing existing typical thermal emitters (≥3 °C cooler) and commercial counterparts (as building materials). Furthermore, the dual-selective sample also exhibits high weather resistance and color compatibility, indicating a high practicality. This work provides a scalable and practical radiative cooling design for sustainable thermal management.
辐射冷却技术是一种零能耗技术，通过大气透明窗口将热量散发到外层空间（约3K），从而实现低于环境温度的冷却。然而，现有的设计通常只关注主要的大气透明窗口（8 - 13μm），而忽略了另一个窗口（16 - 25μm），未能充分发挥其冷却潜力。在此，我们展示了一种基于可扩展热发射器的双选择性辐射冷却设计，该设计在两个大气透明窗口均表现出选择性发射，而在其余中红外和太阳波段表现出反射特性。因此，这种双选择性热发射器在强光下展现出超高的低于环境温度的冷却能力（约9°C），超过了现有的典型热发射器（冷却效果至少高3°C）以及商业同类产品（作为建筑材料）。此外，这种双选择性样品还具有高耐候性和颜色兼容性，显示出很高的实用性。这项工作为可持续热管理提供了一种可扩展且实用的辐射冷却设计。
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