Facing the shortage of freshwater resources, solar desalination technology provides a solution with its green and environmentally friendly features. However, the traditional desalination strategy has some problems, such as low evaporation efficiency and salt deposition. Herein, the asymmetric nanofiber membranes were prepared by electrospinning technology which can realize the photothermal conversion and reduce heat loss because of unique double-layer structure. This evaporator can achieve stable and efficient desalination evaporation efficiencies in highly concentrated brines. What’s more, hydrophilic membrane polyacrylonitrile (PAN) modified with sodium alginate (SA) hydrogel can realize the efficient ions distribution. This work presents a new design strategy for the development of highly efficient photothermal conversion materials for use in solar-driven evaporation.

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