Interfacial solar vapor generation is promising and sustainable for seawater desalination. However, the performance degradation caused by salt accumulation has hindered the development of the interfacial solar vapor generator severely. In this paper, we have designed a lotus leaf like vertical hierarchical solar vapor generator (LSG) for stable evaporation of high-salinity brine. The LSG is assembled by Si/PPy-PVA sponge and multi-root columnar PVA sponge by mimicking the structure of the lotus leaf. The Si/PPy-PVA sponge is fabricated by successively depositing the PPy layer and silane layer on the PVA sponge and acts as the absorber of LSG. LSG enables a stable evaporation rate of 1.35 ± 0.02 kg m^-2 h^-1 out of 26.6 wt.% brine under 1 sun for over 15 days. Besides, LSG demonstrates high efficiency of 92.6 % under 0.25 sun. LSG is also tested to treat different industrial dyeing wastewater with the highest evaporation rate of 1.38 ± 0.01 kg m^-2 h^-1. The condensed water produced by LSG has reached the Class IV Surface Water Standards. Our work provides a new guideline to design high-efficiency solar vapor generators for stable evaporation of high-salinity brine.

界面太阳蒸气的产生对于海水淡化是有希望且可持续的。然而，由于盐积累引起的性能下降严重地阻碍了界面太阳蒸气发生器的发展。在本文中，我们设计了一种荷叶状的垂直分层太阳蒸气发生器（LSG），用于稳定地蒸发高盐度盐水。LSG由Si / PPy-PVA海绵和多根柱状PVA海绵通过模仿荷叶的结构组装而成。Si / PPy-PVA海绵是通过在PVA海绵上依次沉积PPy层和硅烷层而制成的，并充当LSG的吸收剂。LSG可实现1.35±0.02 kg m ^-2 h ^-1的稳定蒸发速率在1个阳光下超过15天，从26.​​6 wt。％的盐水中提取出来。此外，LSG在0.25阳光下的效率高达92.6％。LSG还经过测试，可以处理最高1.38±0.01 kg m ^-2 h ^-1的最高蒸发速率的不同工业印染废水。LSG生产的冷凝水已达到IV级地表水标准。我们的工作为设计高效的太阳能蒸汽发生器以稳定高盐度盐水的蒸发提供了新的指南。