Composite Polyelectrolyte Photothermal Hydrogel with Anti-biofouling and Antibacterial Properties for the Real-World Application of Solar Steam Generation

Solar steam generation provides a promising and low cost solution for freshwater production in energy scarcity areas. However, in real-world applications, evaporators are easily affected by microorganism contamination in source water, causing surface corrosion, structural damage, or even invalidation. Developing anti-biofouling and antibacterial evaporators is significant for long-term stable freshwater production. Herein, a composite polyelectrolyte photothermal hydrogel consisting of sulfobetaine methacrylate (SBMA), [2-(methacryloyloxy)-ethyl] trimethylammonium chloride (METAC), and polypyrrole (PPy) with anti-biofouling and antibacterial properties is developed. Crediting sufficient ammonium groups and zwitterionic segments, the optimized polyelectrolyte hydrogel exhibits an , similar to 90% antibacterial ratio against Staphylococcus aurcus (S. aureus) and Escherichia coli (E. coli) and effectively controls biological contamination. Under 1.0 kW m(-2) solar irradiation, a rapid water evaporation rate of similar to 1.690 kg m(-2) h(-1) and a high solar-to-evaporation efficiency of similar to 95.94% are achieved with the photothermal hydrogel. We show that a lab-made setup integrated with the hydrogel can realize similar to 0.455 kg m(-2) h(-1) freshwater production from seawater under natural sunlight. Moreover, the hydrogel exhibits excellent durability with a stable evaporation rate of , similar to 1.617 kg m(-2) h(-1) in real seawater for over 6 weeks, nuking it fullhearted in the real-world application of solar steam generation.