Passive radiative cooling technology without electric consumption is an emerging sustainability technology that plays a key role in advancing sustainable development. However, most radiative cooling materials are vulnerable to outdoor contamination and thermal/UV exposure, which leads to decreased performance. Herein, we report a hierarchically structured polyimide/zinc oxide (PINF/ZnO) composite membrane that integrates sunlight reflectance of 91.4% in the main thermal effect of the solar spectrum (0.78–1.1 μm), the mid-infrared emissivity of 90.0% (8–13 μm), UV shielding performance, thermal resistance, and ideal hydrophobicity. The comprehensive performance enables the composite membrane to yield a temperature drop of ∼9.3 °C, compared to the air temperature, under the peak solar irradiance of ∼800 W m^–2. In addition, the temperature drop of as-obtained composite membranes after heating at 200 °C for 6 h in a nitrogen/air atmosphere can be well maintained at ∼9.0 °C, demonstrating their ideal radiative cooling effect in a high-temperature environment. Additionally, the PINF/ZnO composite membrane shows excellent chemical durability after exposure to the outdoor environment. This work provides a new strategy to integrate chemical durability and thermal resistance with radiative cooling, presenting great potential for passive radiative cooling materials toward practical applications in harsh environments.

中文翻译：

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用于被动日间辐射冷却的具有光谱选择性的高度稳定的聚酰亚胺复合纳米纤维膜


无电力消耗的被动辐射冷却技术是一种新兴的可持续技术，在推动可持续发展方面发挥着关键作用。然而，大多数辐射冷却材料容易受到室外污染和热/紫外线照射，从而导致性能下降。在此，我们报道了一种分层结构的聚酰亚胺/氧化锌（PINF/ZnO）复合膜，其在太阳光谱（0.78-1.1μm）的主要热效应中集成了91.4％的太阳光反射率，90.0％的中红外发射率（ 8-13μm），屏蔽紫外线性能、耐热性和理想的疏水性。综合性能使复合膜在~800 W m ^–2 峰值太阳辐照度下，与空气温度相比，温度下降~9.3 °C。此外，在氮气/空气气氛中200℃加热6小时后，所获得的复合膜的温降可以很好地保持在~9.0℃，展示了其在高温环境下理想的辐射冷却效果。此外，PINF/ZnO复合膜在暴露于室外环境后表现出优异的化学耐久性。这项工作提供了一种将化学耐久性和耐热性与辐射冷却相结合的新策略，为被动辐射冷却材料在恶劣环境下的实际应用展现了巨大的潜力。