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<p>Solar-driven interfacial evaporation offers a promising solution to global water scarcity. Recent advancements have improved its efficiency by focusing solar energy on hydrophobic photothermal materials. However, energy loss due to the air layer between the hydrophobic materials and water surface remains a key challenge, limiting both water evaporation and solar energy utilization. In response to this challenge, a novel Janus membrane with asymmetric wettability has been developed using simple electrochemical oxidation and spraying techniques. The asymmetric Janus membrane, with hydrophilic polypyrrole and hydrophobic polydimethylsiloxane layers, enhances interfacial heating and solar-driven water evaporation. Wettability tests show contact angles of 21° and 128° for the hydrophilic and hydrophobic surfaces, respectively. The Janus membrane achieves 96.53% light absorption in the visible spectrum and a water evaporation rate of 2.37&#xa0;kg&#xa0;m<sup>−2</sup>&#xa0;h<sup>−1</sup> under simulated sunlight, with a maximum water temperature of 47&#xa0;°C. These findings present the Janus membrane as a promising material for applications in solar-driven desalination and water purification, contributing to advancements in sustainable water management technologies.</p>

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Janus membrane with asymmetric wettability and photothermal conversion for solar-driven interfacial water evaporation

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Mengyan Liu,
  • Benfeng Zhu,
  • Na Chen,
  • Jie Zhu,
  • Jingjing Yang,
  • Yumeng Yang,
  • Jiao Liu,
  • Cuiping Ji,
  • Li Jiang,
  • Guoying Wei

摘要

Solar-driven interfacial evaporation offers a promising solution to global water scarcity. Recent advancements have improved its efficiency by focusing solar energy on hydrophobic photothermal materials. However, energy loss due to the air layer between the hydrophobic materials and water surface remains a key challenge, limiting both water evaporation and solar energy utilization. In response to this challenge, a novel Janus membrane with asymmetric wettability has been developed using simple electrochemical oxidation and spraying techniques. The asymmetric Janus membrane, with hydrophilic polypyrrole and hydrophobic polydimethylsiloxane layers, enhances interfacial heating and solar-driven water evaporation. Wettability tests show contact angles of 21° and 128° for the hydrophilic and hydrophobic surfaces, respectively. The Janus membrane achieves 96.53% light absorption in the visible spectrum and a water evaporation rate of 2.37 kg m−2 h−1 under simulated sunlight, with a maximum water temperature of 47 °C. These findings present the Janus membrane as a promising material for applications in solar-driven desalination and water purification, contributing to advancements in sustainable water management technologies.