Superior photothermal black TiO2 with random size distribution as flexible film for efficient solar steam generation

Black photothermal materials with broadband solar absorption have attracted great interest for efficient steam generation. However, the solar steam device composed of thermal insulators and water supply paths makes the device more intricate and problematic to operate. Herein, inspired by random close packing structure of beetle, black TiO2 (BTiO2) film with random size distribution is fabricated for simplifying the vapor generation device. The...