Interfacial solar steam generation has been regarded
as a promising
method to produce freshwater from seawater. Nevertheless, achieving
simultaneous optimization of high evaporation efficiency along with
stability and durability remains a substantial obstacle for polyimide
(PI)-based solar evaporators. Herein, a hierarchically structured
PI/MXene composite aerogel was prepared by electrostatic spinning,
freeze-drying, and thermal imidization. The combination of PI nanofibers
and MXene endows the hybrid aerogels with three-dimensional porous
structures, intriguing hydrophilicity, and high light absorption,
resulting in augmented light-to-heat conversion efficiency. Furthermore,
the PI/MXene composite aerogel exhibits an excellent water evaporation
rate of 1.459 kg m–2 h–1 under
1 sun with a high photothermal conversion efficiency of 95.6%. The
PI/MXene composite aerogel possesses distinct salt resistance, eminent
structural stability, and remarkable cycling stability with an evaporation
rate of 1.24 kg m–2 h–1 over 10
cycles. This work provides a prospective strategy for constructing
highly efficient solar-powered generator with stable performance for
practical application in seawater desalination.