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Bioinspired photothermal zwitterionic fibrous membrane for high-efficiency solar desalination and electricity generation
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Bioinspired photothermal zwitterionic fibrous membrane for high-efficiency solar desalination and electricity generation
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Journal Article
Bioinspired photothermal zwitterionic fibrous membrane for high-efficiency solar desalination and electricity generation
2025
Overview
Solar-driven desalination holds great promise for addressing the scarcity of global freshwater. However, salt accumulation remains a significant challenge, particularly for two-dimensional membrane materials. Inspired by aquaporins, we design a porous zwitterionic fibrous membrane that selectively transports water while rejecting Na
+
and Cl
−
, achieving efficient evaporation and salt resistance. The incorporation of porphyrin-based conjugated microporous polymers enhances photothermal conversion and antibacterial properties, while zwitterionic groups and porous structure disrupt high-salinity gradients, effectively preventing salt deposition. The membrane achieves an evaporation rate of 2.64 kg m
−2
h
−1
and a photothermal efficiency of 97.6% under 1 kW m
−2
solar irradiation. Furthermore, the coupling of photothermal evaporator and thermoelectric module achieves a stable electric output (power density: 1.5 W m
−2
). This work presents a synergistic strategy for salt resistance, water purification and energy generation, advancing the design of solar-thermal-electric integrated systems.
Solar-driven desalination can address global freshwater scarcity, though salt accumulation remains challenging in membrane design. Here the authors design a zwitterionic fibrous membrane which simultaneously desalinates water and generate energy.
