Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

Mandal, Jyotirmoy; Fu, Yanke; Overvig, Adam C.; Jia, Mingxin; Sun, Kerui; Shi, Norman N.; Zhou, Hua; Xiao, Xianghui; Yu, Nanfang; Yang, Yuan

doi:10.1126/science.aat9513

Title: Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

Journal Article · Thu Sep 27 00:00:00 EDT 2018 · Science

DOI:https://doi.org/10.1126/science.aat9513· OSTI ID:1478138

; Fu, Yanke;

;

; Sun, Kerui;

; Zhou, Hua; Xiao, Xianghui;

;

Passive daytime radiative cooling (PDRC) involves spontaneously cooling a surface by reflecting sunlight and radiating heat to the cold outer space. Current PDRC designs are promising alternatives to electrical cooling but are either inefficient or have limited applicability. We present a simple, inexpensive, and scalable phase inversion-based method for fabricating hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene) [P(VdF-HFP)(HP)] coatings with excellent PDRC capability. High, substrate-independent hemispherical solar reflectances (0.96 +/- 0.03) and long-wave infrared emittances (0.97 +/- 0.02) allow for subambient temperature drops of similar to 6 degrees C and cooling powers of similar to 96 watts per square meter (Wm(-2)) under solar intensities of 890 and 750 Wm(-2), respectively. The performance equals or surpasses those of state-of-the-art PDRC designs, and the technique offers a paint-like simplicity.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; SC0012704

OSTI ID:: 1478138

Alternate ID(s):: OSTI ID: 1482561; OSTI ID: 1503287

Report Number(s):: BNL-209460-2018-JAAM; /sci/362/6412/315.atom

Journal Information:: Science, Journal Name: Science Vol. 362 Journal Issue: 6412; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 702 works

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