supported by the National Natural Science Foundation of China(52473270 and T2422028);the China Postdoctoral Science Foundation(2024M763485);the National Key R&D Program of China(2022YFA1203304);the Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences(start-up grant E1552102).
During the daytime,conventional radiative coolers disregard the directionality of thermal radiation,thereby overlooking the upward radiation from the ground.This upward radiation enhances the outward thermal radiation...