Passive daytime radiative cooling technology can cool objects without any energy consumption. Although some progress has been made, there are still challenges in manufacturing low-cost, anticontaminant, and weathering-resistant radiative coolers for long-term cooling. Herein, a superhydrophobic flexible cooling radiator (SFCR) as a film is fabricated by a facile, inexpensive, and scalable electrospinning and electrospraying method. The SFCR film consists of poly­(vinylidene fluoride-co-hexafluoropropylene) fiber frameworks adhered to by numerous microaggregates from SiO2 nanoparticles. The SFCR film exhibited a strong solar reflectivity of 98.5% and an average emissivity of more than 95%. It also showed superior superhydrophobicity and wettability with a static water contact angle of 156° and sliding angle of 2.2°. The average temperature drop of the film was 11.6 °C compared to the air around the film under sunlight. Importantly, the self-cleaning effect of the SFCR film robustly protects its surface against outdoor contamination and is conducive to sustainable cooling. This SFCR film integrating radiative cooling with self-cleaning characteristics is promising for scalable production and can be utilized on buildings, vehicles, and other terrestrial objects.

Traditional electric cooling in summer and coal heating in winter consume a huge amount of energy and lead to a greenhouse effect. Herein, we developed an energy-free dual-mode superhydrophobic film, which consists of a white side with porous coating of styrene-ethylene-butylene-styrene/SiO 2 for radiative cooling and a black side with nanocomposite coating of carbon nanotubes/polydimethylsiloxane for solar heating. In the cooling mode with the white side, the film achieved a high sunlight reflection of 94% and a strong long-wave infrared emission of 92% in the range of 8–13 μm to contribute to a temperature drop of ∼11 °C. In the heating mode with the black side, the film achieved a high solar absorption of 98% to induce heating to raise the air temperature beneath by Δ T of ∼35.6 °C. Importantly, both sides of the film are superhydrophobic with a contact angle over 165° and a sliding angle near 0°, showing typical self-cleaning effects, which defend the surfaces from outdoor contamination, thus conducive to long-term cooling and heating. This dual-mode film shows great potential in outdoor applications as coverings for both cooling in hot summer and heating in winter without an energy input.