Journal
GLOBAL CHALLENGES
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/gch2.202300091
Keywords
fresh water; LSCF; MXenes; perovskite; photothermal; solar energy; water scarcity
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A self-regenerating hydrogel composed of 2D-MXenes nanosheets embedded in perovskite La Sr-0.6 Co-0.4 Fe-0.2 O-0.8(3-)& delta; (LSCF)/polyvinyl alcohol hydrogels has been developed for efficient solar-driven evaporation and seawater desalination. The composite hydrogel exhibits excellent evaporation rates and broadband solar absorption, and can dilute concentrated brines without impeding the evaporation rate or salt accumulation.
Solar evaporation is a facile and promising technology to efficiently utilize renewable energy for freshwater production and seawater desalination. Here, the fabrication of self-regenerating hydrogel composed of 2D-MXenes nanosheets embedded in perovskite La Sr-0.6 Co-0.4 Fe-0.2 O-0.8(3-)& delta; (LSCF)/polyvinyl alcohol hydrogels for efficient solar-driven evaporation and seawater desalination is reported. The mixed dimensional LSCF/Ti3C2 composite features a localized surface plasmonic resonance effect in the polymeric network of polyvinyl alcohol endows excellent evaporation rates (1.98 kg m(-2) h(-1)) under 1 k Wm(-2) or one sun solar irradiation ascribed by hydrophilicity and broadband solar absorption (96%). Furthermore, the long-term performance reveals smooth mass change (13.33 kg m(-2)) during 8 h under one sun. The composite hydrogel prompts the dilution of concentrated brines and redissolves it back to water (1.2 g NaCl/270 min) without impeding the evaporation rate without any salt-accumulation. The present research offers a substantial opportunity for solar-driven evaporation without any salt accumulation in real-life applications.
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