Desalination technology by interfacial water evaporator is meaningful to solve the increasing global freshwater shortage. Herein, we prepared an efficient and lightweight silicon dioxide/carboxylated multi-walled carbon nanotube/polyacrylonitrile (SiO₂/MWCNTs-COOH/PAN) fiber membrane by electrospinning. And then an interfacial water evaporator was assembled by attaching it onto a piece of filter paper with insulation polystyrene (PS) foam used as support material, and cotton yarns (CYs) used for water transportation. The advantages of this design can prevent heat from dissipating to the bulk water and ensure good evaporation efficiency. The composite fiber membrane exhibited an excellent evaporation rate of 1.28 kg m^-2 h^-1 and a superior photothermal conversion efficiency of 82.52 % under 1 sun illumination (1000 W m⁻²). Water absorption capability was also demonstrated by MMT, CA and capillary effect tests, while thermal management capacity was analyzed by infrared thermal imaging camera. Furthermore, the prepared composite fiber membrane remained stable evaporation rate and high efficiency even after standing 20 repeated evaporation cycles. Thus, this interfacial water evaporator prepared by this work has an outstanding photothermal conversion capability and will be a promising candidate used for solar-driven seawater desalination.

界面水蒸发器的脱盐技术对解决全球日益严重的淡水短缺具有重要意义。在这里，我们通过静电纺丝制备了一种高效轻质的二氧化硅/羧化多壁碳纳米管/聚丙烯腈（SiO ₂ / MWCNTs-COOH / PAN）纤维膜。然后，将界面水蒸发器安装到一张滤纸上，以绝缘聚苯乙烯（PS）泡沫作为支撑材料，并用棉纱（CYs）进行水运输，从而组装该界面水蒸发器。这种设计的优点是可以防止热量散发到大量水中，并确保良好的蒸发效率。该复合纤维膜表现出出色的蒸发速率，为1.28 kg m ^-2 h ^-1在1个太阳光下（1000 W m ^-2），光热转换效率高达82.52％。MMT，CA和毛细管效应测试也证明了其吸水能力，而红外热像仪则分析了热管理能力。此外，制备的复合纤维膜即使经过20个重复的蒸发循环仍保持稳定的蒸发速率和高效率。因此，通过这项工作制备的这种界面水蒸发器具有出色的光热转化能力，将成为用于太阳能驱动海水淡化的有前途的候选者。