Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

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

doi:10.1126/science.aat9513

Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

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

Research output: Contribution to journal › Article › peer-review

1367 Scopus citations

Abstract

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 ∼6°C and cooling powers of ∼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-ofthe-art PDRC designs, and the technique offers a paint-like simplicity.

Original language	English (US)
Pages (from-to)	315-319
Number of pages	5
Journal	Science
Volume	362
Issue number	6412
DOIs	https://doi.org/10.1126/science.aat9513
State	Published - Oct 19 2018
Externally published	Yes

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title = "Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling",

abstract = "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 ∼6°C and cooling powers of ∼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-ofthe-art PDRC designs, and the technique offers a paint-like simplicity.",

author = "Jyotirmoy Mandal and Yanke Fu and Overvig, {Adam C.} and Mingxin Jia and Kerui Sun and Shi, {Norman N.} and Hua Zhou and Xianghui Xiao and Nanfang Yu and Yuan Yang",

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doi = "10.1126/science.aat9513",

language = "English (US)",

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T1 - Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

AU - Mandal, Jyotirmoy

AU - Fu, Yanke

AU - Overvig, Adam C.

AU - Jia, Mingxin

AU - Sun, Kerui

AU - Shi, Norman N.

AU - Zhou, Hua

AU - Xiao, Xianghui

AU - Yu, Nanfang

AU - Yang, Yuan

PY - 2018/10/19

Y1 - 2018/10/19

N2 - 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 ∼6°C and cooling powers of ∼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-ofthe-art PDRC designs, and the technique offers a paint-like simplicity.

AB - 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 ∼6°C and cooling powers of ∼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-ofthe-art PDRC designs, and the technique offers a paint-like simplicity.

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DO - 10.1126/science.aat9513

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VL - 362

SP - 315

EP - 319

JO - Science

JF - Science

IS - 6412

ER -

Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

Abstract

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