Solar-driven interfacial steam generation is a sustainable and energy-saving method to obtain clean water by confining small amounts of water on the evaporation surface. Herein, we prepared a flexible Janus membrane-based evaporator for solar-driven desalination. A silica nanofibrous membrane with low thermal conductivity can continuously pump water; meanwhile, the graphene oxide/carbon nanotubes hybrid layer can localize heat energy and generate water vapor. Optimal evaporation performance and energy efficiency can be achieved by adjusting the morphology of the photothermal layer and the thickness of the nanofibrous membrane. For the self- floating Janus membrane, the evaporation rate was 1.30 kg m⁻² h⁻¹ with a light-to-vapor energy conversion efficiency of 74% under 1 sun illumination (1 kW m⁻²), and the performance can be enhanced significantly in a tree-like configuration. In the long-term solar desalination, the membrane can realize stable evaporation and auto-cleaning. Therefore, the Janus nanofibrous membrane-based evaporator had great potential in the solar desalination.

太阳能驱动的界面蒸汽产生是一种可持续且节能的方法，它通过将少量水限制在蒸发表面上来获得纯净水。在这里，我们准备了一个灵活的基于Janus膜的蒸发器，用于太阳能驱动的脱盐。低导热率的二氧化硅纳米纤维膜可以连续抽水；同时，氧化石墨烯/碳纳米管杂化层可以局部化热能并产生水蒸气。通过调节光热层的形态和纳米纤维膜的厚度，可以获得最佳的蒸发性能和能效。对于自浮式Janus膜，蒸发速率为1.30 kg m ^-2  h ^-1在1个太阳光照（1 kW m ^-2）下，光汽能量转换效率为74％，并且在树形配置中可以显着提高性能。在长期的海水淡化中，该膜可实现稳定的蒸发和自动清洁。因此，Janus纳米纤维膜基蒸发器在太阳能淡化方面具有巨大潜力。