Interfacial solar steam generation (ISSG) is considered to be an attractive technique to address the water shortage. However, developing a sustainable thermal management, salt rejection, and excellent mechanical strength ISSG device for long-term stability desalination is still a challenge. Herein, a biomass ISSG device with superb mechanical properties was prepared by introducing a luffa sponge as the skeleton and constructing the MXene/cellulose nanofibers (CNFs) aerogels via freeze-drying. The Janus MXene-decorated CNFs/luffa (JMCL) aerogels integrated the multifunction of fast water transport, good thermal management, and efficient photothermal conversion in a single module, to achieve high-efficiency desalination. 3D Janus structure endowed the JMCL aerogel with opposite wettability, which is feasible to construct the localized photothermal generation and self-floating. The mechanical strength of JMCL aerogels is 437 times that of MXene/CNFs aerogels. The JMCL aerogels delivered a water evaporation rate of 1.40 kg m^-2h⁻¹ and an efficiency of 91.20% under 1 sun illumination. The excellent salt resistance during 24 h working and long-term solar vapor generation of up to 28 days were achieved. The multifunctional JMCL aerogels with 3D Janus structure offer new insights for developing good durability and eco-friendly biopolymer-based steam generators.

界面太阳能蒸汽发电 (ISSG) 被认为是解决缺水问题的有吸引力的技术。然而，开发可持续的热管理、脱盐率和出色的机械强度 ISSG 装置以实现长期稳定的脱盐仍然是一个挑战。在此，通过引入丝瓜海绵作为骨架并通过冷冻干燥构建 MXene/纤维素纳米纤维 (CNF) 气凝胶，制备了具有优异机械性能的生物质 ISSG 装置。Janus MXene 装饰的 CNFs/luffa (JMCL) 气凝胶在单个模块中集成了快速水传输、良好的热管理和高效光热转换的多功能，实现了高效海水淡化。3D Janus 结构赋予 JMCL 气凝胶相反的润湿性，构建局部光热发电和自漂浮是可行的。JMCL气凝胶的机械强度是MXene/CNFs气凝胶的437倍。JMCL 气凝胶的水分蒸发率为 1.40 kg m^-2 h ^-1并且在1太阳光照下的效率为91.20%。实现了 24 小时工作期间出色的耐盐性和长达 28 天的长期太阳能蒸汽产生。具有 3D Janus 结构的多功能 JMCL 气凝胶为开发耐用且环保的生物聚合物基蒸汽发生器提供了新的思路。