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设备，可高效集水。

从雾中收集水已受到广泛关注，以应对沙漠和干旱地区缺乏清洁饮用水的挑战。当前，太阳热能技术被用作一种有效，可持续和低成本的方法，用于淡化水以生产清洁水。为了收集清洁水，近年来，大多数研究人员已经设计了水收集表面的结构。然而，在液滴的液化过程中释放的热量对液滴的冷凝具有不利影响，因此影响集水效率。在这里，为了提高集水效率，在集水表面的背面引入了辐射冷却层，以散发液滴液化过程中释放的热量。辐射冷却层₂和CaMoO ₄纳米颗粒在白天理论上可以冷却到低于环境温度18.1°C。在集水表面的背面增加冷却涂层，可以使集水效率提高43–52％。发达的集水装置可为有效收集淡水提供一条新途径。