Magnetic field induced the assembling of Photothermal evaporator for efficient solar‐driven desalination

Solar-driven interfacial evaporation is a sustainable and economical technology for freshwater generation. Structural design of photothermal material an effective strategy to improve the performance but usually bothered by complicated processes non-adjustability. Herein, magnetic nanoparticles assembled evaporator was developed, which showed adjustable spinal array surface under uniform field induction. By regulating position in field, desirable structures could be at relatively low load density light absorption via multiple reflections. Magnetic induced accelerate over 1.39 kg m−2 h−1 1-sun illumination, 2.8 times that natural evaporation. After coated carbon layer, overcome oxidation realize stable long-term desalination. The facile optimize structure appropriate various fields with special requirements on structure.