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<p>Atmospheric water harvesting is a promising approach for potable water generation, particularly in dry landlocked environments, but high energy costs for condensation and capture remain a fundamental impediment. Passive radiative cooling offers an attractive alternative, cooling surfaces below the dew point without active energy input. However, experimental performance has been limited, with both condensation and collection of dew on radiative cooling surfaces remaining challenging. Here, we introduce a slippery hydrophilic radiative cooling surface that through its high infrared emissivity enables effective sub-ambient cooling, and through its surface wettability optimizes both condensation and collection of atmospheric water. In addition, we demonstrate a vertically oriented device architecture that allows for optimizing convection, collecting 25 g/m² of atmospheric water over 6 h of outdoor nighttime testing at relative humidities of 65% and 45 g/m²/h at relative humidities of 95%. We also develop a model that accurately predicts system performance and show that our approach enables water generation and collection approaching the thermodynamic limit of radiative cooling-driven dew condensation. These results highlight the potential of passive radiative cooling as a practical, cost-effective technology for water generation worldwide.</p>

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Slippery hydrophilic radiative cooling surfaces for optimal dew condensation and collection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Xin Huang,
  • Shuwang Wu,
  • Jyotirmoy Mandal,
  • Aryan Zaveri,
  • Pengju Shi,
  • Ximin He,
  • Aaswath P. Raman

摘要

Atmospheric water harvesting is a promising approach for potable water generation, particularly in dry landlocked environments, but high energy costs for condensation and capture remain a fundamental impediment. Passive radiative cooling offers an attractive alternative, cooling surfaces below the dew point without active energy input. However, experimental performance has been limited, with both condensation and collection of dew on radiative cooling surfaces remaining challenging. Here, we introduce a slippery hydrophilic radiative cooling surface that through its high infrared emissivity enables effective sub-ambient cooling, and through its surface wettability optimizes both condensation and collection of atmospheric water. In addition, we demonstrate a vertically oriented device architecture that allows for optimizing convection, collecting 25 g/m² of atmospheric water over 6 h of outdoor nighttime testing at relative humidities of 65% and 45 g/m²/h at relative humidities of 95%. We also develop a model that accurately predicts system performance and show that our approach enables water generation and collection approaching the thermodynamic limit of radiative cooling-driven dew condensation. These results highlight the potential of passive radiative cooling as a practical, cost-effective technology for water generation worldwide.