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

High-entropy-alloy (HEA) nanoparticles with excellent photothermal conversion performances have been proven effective for solar steam generation abilities, but it remains a challenge to fabricate a macroscale evaporator through them. Here, assisting by the unique anisotropic porous structures of balsawood matrixes, a sustainable HEA-nanoparticles-balsawood (HEA-BW) composited evaporator, in which two compositions construct an asymmetric surface wettability that the top surface of HEA nanoparticles acts as a hydrophobic photothermal area, while the bottom hydrophilic surface of balsawood allows for rapid water transportation, is assembled. The most efficient 8-HEA-BW realized an average optical absorption greater than 97% over the entire solar spectrum (250-2500 nm) and an excellent evaporation rate of 2.58 kg m(-2) h(-1) with a surface temperature of 80 degrees C under one sun irradiation. Surprisingly, a stable solar desalination performance of such composited evaporator can be observed in a 10-cycles long-term evaluation of the hypersaline water (20 wt% salinity) with an average evaporation rate of 1.65 kg m(-2) h(-1).