Liu Xiaofei, Hou Lanlan, Hu Rongjun, Zhang Huiying, Zhang Xuefeng, Ge Xinran, Zhang Ying, Yue Guichu, Cui Zhimin, Bai Jie, Liu Jingchong, Wang Nü, Li Yong, Zhao Yong
Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bioinspired Energy Materials and Devices, School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, P. R. China.
School of Printing and Packaging Engineering, Beijing Institute of Graphic Communication, Beijing 102600, P. R. China.
ACS Appl Mater Interfaces. 2024 Nov 13;16(45):62710-62720. doi: 10.1021/acsami.4c14726. Epub 2024 Oct 29.
Solar evaporation is an ecofriendly and practical method for seawater desalination. The photothermal layer, which absorbs solar energy and converts it to thermal energy, plays a crucial role in enhancing the efficiency of the evaporator. However, structural design methods for photothermal layers are often complex and energy-intensive. This work reports a simple and efficient strategy for fabricating a necklace-like beaded nanofiber self-organized honeycomb-structured photothermal material. The honeycomb-like cavities form numerous microscale thermal traps, achieving thermal localization while maintaining high energy utilization efficiency, which not only increases light absorption but also facilitates the diffusion and escape of steam. Besides, the hydrophobic honeycomb layer separates the photothermal layer and the interface water, which reduces considerable heat conduction loss and achieves an effective antisalting performance. These functional features endow the evaporator with an evaporation efficiency of 92.9%, and the evaporation rate reaches 2.11 kg m h at 1 sun irradiance, demonstrating its great potential for practical solar-driven seawater desalination under natural sunlight.
太阳能蒸发是一种用于海水淡化的环保且实用的方法。吸收太阳能并将其转化为热能的光热层在提高蒸发器效率方面起着关键作用。然而，光热层的结构设计方法通常复杂且耗能。这项工作报道了一种简单高效的策略，用于制造项链状串珠纳米纤维自组装蜂窝结构光热材料。蜂窝状空腔形成众多微尺度热阱，在保持高能量利用效率的同时实现热局域化，这不仅增加了光吸收，还促进了蒸汽的扩散和逸出。此外，疏水蜂窝层将光热层与界面水隔开，减少了相当大的热传导损失，并实现了有效的抗盐析性能。这些功能特性使蒸发器具有92.9%的蒸发效率，在1个太阳辐照度下蒸发速率达到2.11 kg m² h，证明了其在自然阳光下实际太阳能驱动海水淡化方面的巨大潜力。
