Water collection from fog has received much attention to meet the challenges of scarcity of clean drinking water in desert and arid regions. Currently, solar‐thermal technology is being used as an efficient, sustainable, and low‐cost method for water desalination to produce clean water. To collect the clean water, in recent years, most researchers have designed the structure of water collection surfaces. However, the heat released during the liquefaction process of droplets has an adverse effect on the condensation of droplets, and thus affecting the water collection efficiency. Here, in order to improve water collection efficiency, a radiative cooling layer is introduced on the back of the collection surface to dissipate the heat released during droplet liquefaction. The radiative cooling layer, consisting of poly(vinylidene fluoride‐co‐hexafluoropropene) embedded with SiO₂ and CaMoO₄ nanoparticles, can theoretically cool 18.1 °C below the ambient temperature in the daytime. With the addition of cooling coating on the back of the water collection surface, the water harvesting efficiency can be increased by 43–52%. The developed water harvesting device may provide a new pathway to the efficient collection of fresh water.

中文翻译：

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一种基于双面功能结构的实用装置，可实现高效集水。


为了应对沙漠和干旱地区清洁饮用水短缺的挑战，雾水收集受到了广泛关注。目前，太阳能热技术被用作一种高效、可持续且低成本的海水淡化方法来生产清洁水。为了收集清洁的水，近年来，大多数研究人员设计了集水表面的结构。然而，液滴液化过程中释放的热量对液滴的冷凝产生不利影响，从而影响集水效率。这里，为了提高水收集效率，在收集表面的背面引入辐射冷却层以散发液滴液化过程中释放的热量。辐射冷却层由嵌入SiO ₂和CaMoO ₄纳米粒子的聚偏二氟乙烯-六氟丙烯共聚物组成，理论上可以在白天将温度降低到环境温度以下18.1℃。通过在集水表面背面添加冷却涂层，集水效率可提高43-52%。开发的集水装置可能为有效收集淡水提供新途径。