Solar steam generation is one of the most promising technologies to utilize solar energy, which is applied to extract fresh water from seawater or contaminated water. However, solar vapour generation is usually restricted to the underutilization of solar energy or depends on complicated light-harvesting adjuncts. Here, a novel hierarchically double-layered evaporation device was demonstrated based on poly(ionic liquid)s hydrogel with the upper surface co-modified by polypyrrole (PPy) and silver particles (named as Ag/PPy-PMBA-BrILs). The evaporation system exhibits a cooperative interaction of the double-layer with efficient light-absorbing and water transportation, leading to a high evaporation rate of 1.37 kg m⁻² h⁻¹ with a photothermal conversion efficiency of 88.7% under 1 sun illumination. The high evaporation rate is mainly due to the synergistic light absorption of polypyrrole and silver particles as well as the excellent water transfer capability of poly(ionic liquid)s hydrogel. Moreover, the hydrogel-based evaporation device also exhibits excellent salt-resistant performance for solar desilination in artificial sea water. The high-efficiency poly(ionic liquid)s hydrogel based solar steam generator with co-modified light-absorbing surface may open new opportunities for the future design and fabrication of high-performanced solar steam generator for practical applications.

太阳能蒸汽发电是利用太阳能的最有前途的技术之一，该技术可用于从海水或污水中提取淡水。但是，太阳蒸气的产生通常仅限于太阳能的未充分利用，或者取决于复杂的光收集辅助设备。在此，以聚吡咯（PPy）和银粒子（称为Ag / PPy-PMBA-BrILs）共同修饰了上表面的聚（离子液体）水凝胶为基础，展示了一种新颖的分层双层蒸发装置。蒸发系统表现出双层与高效吸光和水传输的协同相互作用，从而导致1.37 kg m ^-2  h ^-1的高蒸发速率在1个阳光下的光热转换效率为88.7％。较高的蒸发速率主要归因于聚吡咯与银颗粒的协同光吸收，以及聚离子液体水凝胶的出色的水转移能力。此外，基于水凝胶的蒸发装置对于人造海水中的太阳能脱硅也表现出优异的耐盐性能。具有共改性的光吸收表面的高效聚（离子液体）水凝胶基太阳能蒸汽发生器可能为未来设计和制造用于实际应用的高性能太阳能蒸汽发生器提供新的机会。