Passive radiative cooling (PRC), as an energy-free cooling strategy, is ingeniously harnessed for sure pure organisms to face up to excessive high-temperature climates, which has impressed quite a few bionic designs. Nevertheless, it’s a nice problem to boost the sturdiness of the designed supplies in sensible situations whereas inheriting the pure organic ideas. We show bionic dual-scale structured (BDSS) movies for environment friendly passive radiative cooling accompanied by strong sturdiness after discovering the wonderful thermoregulatory properties of the inside floor of Hawaiian scallop shell. We discovered that the inside floor of the shell consists of large-scale triangular ridges scattered with small-scale terrace steps. This dual-scale construction can improve the reflectivity of daylight by environment friendly Mie scattering and enhance the emissivity within the mid-infrared vary by lengthening the propagation of photons, thereby reducing the floor temperature. Underpinned by this discovering, we developed a BDSS movie that includes a sturdy photo voltaic spectrum reflectivity of 0.95 and a excessive mid-infrared emissivity of 0.98, attaining a sub-ambient cooling of 10.8 °C below direct daylight. Moreover, the designed movies possess strong sturdiness together with wonderful self-cleaning, flexibility, mechanical energy, chemical stability, and anti-ultraviolet radiation, which is promising for thermal thermoregulation in numerous harsh situations.
