High-Entropy-Alloy-Nanoparticles Enabled Wood Evaporator for Efficient Photothermal Conversion and Sustainable Solar Desalination

摘要

High-entropy-alloy (HEA) nanoparticles with excellent photothermal conversionperformances have been proven effective for solar steam generationabilities, but it remains a challenge to fabricate a macroscale evaporatorthrough them. Here, assisting by the unique anisotropic porous structures ofbalsawood matrixes, a sustainable HEA-nanoparticles-balsawood (HEA-BW)composited evaporator, in which two compositions construct an asymmetricsurface wettability that the top surface of HEA nanoparticles acts asa hydrophobic photothermal area, while the bottom hydrophilic surface ofbalsawood allows for rapid water transportation, is assembled. The mostefficient 8-HEA-BW realized an average optical absorption greater than 97%over the entire solar spectrum (250–2500 nm) and an excellent evaporationrate of 2.58 kg m~（?2） h~（?1） with a surface temperature of 80℃ under one sunirradiation. Surprisingly, a stable solar desalination performance of suchcomposited evaporator can be observed in a 10-cycles long-term evaluationof the hypersaline water (20 wt% salinity) with an average evaporation rate of1.65 kg m~（?2） h~（?1）.