Spectrally Selective Daytime Radiative Cooling Coating
Abstract
ABSTRACT Passive daytime radiative cooling offers a carbon‑free route to mitigate urban heat islands and reduce building energy use. Conventional broadband emitters, however, suffer from parasitic absorption of ambient thermal radiation from hot ground and adjacent buildings, severely compromising net cooling in dense urban settings. We present a scalable, spectrally selective radiative cooling coating that overcomes this urban penalty. By combining a phase‑inversion‑derived micro‑nano porous poly (vinyl fluoride) (PVF) layer with a reflective silver substrate, our emitter achieves a record spectral selectivity of 1.37, with 97.5% solar reflectance and 94.4% mid‑infrared emittance strictly confined to the atmospheric window (8_13 µm). In simulated urban canyon tests, the selective emitter stayed 1.9°C cooler than a broadband counterpart, effectively neutralizing heat gain from surrounding infrastructure. The coating also exhibits excellent scalability, adhesion, self‑cleaning ability, and chemical durability. By bridging performance, manufacturability, and resilience, this work offers a viable pathway for adopting radiative cooling in sustainable urban development.
Article Details
Authors (9)
Siyuan Jia
Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control for Aerospace Structures and Institute for Frontier Science Nanjing University of Aeronautics and Astronautics Nanjing China
Ronghui Wu
Syeda Mishal Zahra
Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control for Aerospace Structures and Institute for Frontier Science Nanjing University of Aeronautics and Astronautics Nanjing China
Hafiz M. Asfahan
Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control for Aerospace Structures and Institute for Frontier Science Nanjing University of Aeronautics and Astronautics Nanjing China
Sujin Shao
Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control for Aerospace Structures and Institute for Frontier Science Nanjing University of Aeronautics and Astronautics Nanjing China
Meng Chen
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering
Xiaofeng Jiang
Wanlin Guo
National Key Laboratory of Mechanics and Control for Aerospace Structures and Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Institute for Frontier Science
Xiuqiang Li
Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control for Aerospace Structures and Institute for Frontier Science Nanjing University of Aeronautics and Astronautics Nanjing China