Bioinspired Durable Daytime Radiative Cooling Wood: Realizing Outdoor Longtime Use

on the structure of delignified wood, including both high solar reflectance (0.958), infrared emittance (0.95), mechanical strength (47 MPa), and UV resistance. The unique structure can prevent breaking of the C-O-C skeleton of wood under direct sunlight; the daytime cooling efficiency of DCW can maintain 4.5 °C after 720 h of UV exposure. This work paves the way for the development of durable daytime radiative cooling materials for energy savings.