Sub-ambient daytime radiative cooling by silica-coated porous anodic aluminum oxide

Dasol Lee; Myeongcheol Go; Soomin Son; Minkyung Kim; Trevon Badloe; Heon Lee; Jin Kon Kim; Junsuk Rho

doi:10.1016/j.nanoen.2020.105426

Sub-ambient daytime radiative cooling by silica-coated porous anodic aluminum oxide

Dasol Lee, Myeongcheol Go, Soomin Son, Minkyung Kim, Trevon Badloe, Heon Lee, Jin Kon Kim, Junsuk Rho

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

165 Citations (Scopus)

Abstract

An energy-free daytime radiative cooler based on silica-coated porous anodic aluminum oxide is proposed, optimized, and experimentally realized. It is shown that a simple thin silica layer coating on porous anodic aluminum oxide can produce the spectral emissivity in the atmospheric window (8-13μm) required for sub-ambient cooling effect under direct sunlight. The final design, optimized using effective medium theory, exhibits high reflectance of 0.86 in the solar spectral region, and a substantial average emissivity of 0.96 in the atmospheric window. The fabricated centimeter-scale radiative cooler demonstrates a maximum cooling of 6.1 °C below ambient during the daytime. We believe that the proposed approach is a promising way to produce inexpensive and efficient radiative coolers.

Original language	English
Article number	105426
Journal	Nano Energy
Volume	79
DOIs	https://doi.org/10.1016/j.nanoen.2020.105426
Publication status	Published - 2021 Jan

Bibliographical note

Funding Information:
Prof. Jin Kon Kim is a POSTECH fellow and a full professor in Chemical Engineering at POSTECH. Also, he is the director of the Center for Smart Block Copolymer Self-Assembly funded by the National Creativity Research Initiative Program supported by National Research Foundation of Korea. He received his B.S. (1980) from Seoul National University (Korea) in Chemical Engineering and M.S. (1982) from Korea Advanced Institute of Science and Technology (Korea) in Chemical Engineering, and Ph.D. (1990) from Polytechnic University in Chemical Engineering. His research interests include phase behavior and transition of block copolymers, development of new functional nanocomposites containing polymer blends.

Funding Information:
This work was supported by the Green Science program funded by POSCO and the National Research Foundation (NRF) grants ( NRF-2019R1A2C3003129 , CAMM-2019M3A6B3030637 , NRF-2019R1A5A8080290 , NRF-2018M3D1A1058997 ) funded by the Ministry of Science and ICT (MSIT) , Republic of Korea. J.K.K. acknowledges the National Creative Research Initiative program ( NRF-2013R1A3A2042196 ) funded by the NRF-MSIT, Republic of Korea . M.K. acknowledges the NRF Global PhD fellowship ( NRF - 2017H1A2A1043204 ) funded by the Ministry of Education, Republic of Korea .

Funding Information:
This work was supported by the Green Science program funded by POSCO and the National Research Foundation (NRF) grants (NRF-2019R1A2C3003129, CAMM-2019M3A6B3030637, NRF-2019R1A5A8080290, NRF-2018M3D1A1058997) funded by the Ministry of Science and ICT (MSIT), Republic of Korea. J.K.K. acknowledges the National Creative Research Initiative program (NRF-2013R1A3A2042196) funded by the NRF-MSIT, Republic of Korea. M.K. acknowledges the NRF Global PhD fellowship (NRF-2017H1A2A1043204) funded by the Ministry of Education, Republic of Korea.

Publisher Copyright:
© 2020

Keywords

Anodic aluminum oxide
Atomic layer deposition
Daytime
Passive
Radiative cooling
Selective emitter

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Materials Science
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nanoen.2020.105426

Cite this

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title = "Sub-ambient daytime radiative cooling by silica-coated porous anodic aluminum oxide",

abstract = "An energy-free daytime radiative cooler based on silica-coated porous anodic aluminum oxide is proposed, optimized, and experimentally realized. It is shown that a simple thin silica layer coating on porous anodic aluminum oxide can produce the spectral emissivity in the atmospheric window (8-13μm) required for sub-ambient cooling effect under direct sunlight. The final design, optimized using effective medium theory, exhibits high reflectance of 0.86 in the solar spectral region, and a substantial average emissivity of 0.96 in the atmospheric window. The fabricated centimeter-scale radiative cooler demonstrates a maximum cooling of 6.1 °C below ambient during the daytime. We believe that the proposed approach is a promising way to produce inexpensive and efficient radiative coolers.",

keywords = "Anodic aluminum oxide, Atomic layer deposition, Daytime, Passive, Radiative cooling, Selective emitter",

author = "Dasol Lee and Myeongcheol Go and Soomin Son and Minkyung Kim and Trevon Badloe and Heon Lee and Kim, {Jin Kon} and Junsuk Rho",

note = "Funding Information: Prof. Jin Kon Kim is a POSTECH fellow and a full professor in Chemical Engineering at POSTECH. Also, he is the director of the Center for Smart Block Copolymer Self-Assembly funded by the National Creativity Research Initiative Program supported by National Research Foundation of Korea. He received his B.S. (1980) from Seoul National University (Korea) in Chemical Engineering and M.S. (1982) from Korea Advanced Institute of Science and Technology (Korea) in Chemical Engineering, and Ph.D. (1990) from Polytechnic University in Chemical Engineering. His research interests include phase behavior and transition of block copolymers, development of new functional nanocomposites containing polymer blends. Funding Information: This work was supported by the Green Science program funded by POSCO and the National Research Foundation (NRF) grants ( NRF-2019R1A2C3003129 , CAMM-2019M3A6B3030637 , NRF-2019R1A5A8080290 , NRF-2018M3D1A1058997 ) funded by the Ministry of Science and ICT (MSIT) , Republic of Korea. J.K.K. acknowledges the National Creative Research Initiative program ( NRF-2013R1A3A2042196 ) funded by the NRF-MSIT, Republic of Korea . M.K. acknowledges the NRF Global PhD fellowship ( NRF - 2017H1A2A1043204 ) funded by the Ministry of Education, Republic of Korea . Funding Information: This work was supported by the Green Science program funded by POSCO and the National Research Foundation (NRF) grants (NRF-2019R1A2C3003129, CAMM-2019M3A6B3030637, NRF-2019R1A5A8080290, NRF-2018M3D1A1058997) funded by the Ministry of Science and ICT (MSIT), Republic of Korea. J.K.K. acknowledges the National Creative Research Initiative program (NRF-2013R1A3A2042196) funded by the NRF-MSIT, Republic of Korea. M.K. acknowledges the NRF Global PhD fellowship (NRF-2017H1A2A1043204) funded by the Ministry of Education, Republic of Korea. Publisher Copyright: {\textcopyright} 2020",

year = "2021",

month = jan,

doi = "10.1016/j.nanoen.2020.105426",

language = "English",

volume = "79",

journal = "Nano Energy",

issn = "2211-2855",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Sub-ambient daytime radiative cooling by silica-coated porous anodic aluminum oxide

AU - Lee, Dasol

AU - Go, Myeongcheol

AU - Son, Soomin

AU - Kim, Minkyung

AU - Badloe, Trevon

AU - Lee, Heon

AU - Kim, Jin Kon

AU - Rho, Junsuk

N1 - Funding Information: Prof. Jin Kon Kim is a POSTECH fellow and a full professor in Chemical Engineering at POSTECH. Also, he is the director of the Center for Smart Block Copolymer Self-Assembly funded by the National Creativity Research Initiative Program supported by National Research Foundation of Korea. He received his B.S. (1980) from Seoul National University (Korea) in Chemical Engineering and M.S. (1982) from Korea Advanced Institute of Science and Technology (Korea) in Chemical Engineering, and Ph.D. (1990) from Polytechnic University in Chemical Engineering. His research interests include phase behavior and transition of block copolymers, development of new functional nanocomposites containing polymer blends. Funding Information: This work was supported by the Green Science program funded by POSCO and the National Research Foundation (NRF) grants ( NRF-2019R1A2C3003129 , CAMM-2019M3A6B3030637 , NRF-2019R1A5A8080290 , NRF-2018M3D1A1058997 ) funded by the Ministry of Science and ICT (MSIT) , Republic of Korea. J.K.K. acknowledges the National Creative Research Initiative program ( NRF-2013R1A3A2042196 ) funded by the NRF-MSIT, Republic of Korea . M.K. acknowledges the NRF Global PhD fellowship ( NRF - 2017H1A2A1043204 ) funded by the Ministry of Education, Republic of Korea . Funding Information: This work was supported by the Green Science program funded by POSCO and the National Research Foundation (NRF) grants (NRF-2019R1A2C3003129, CAMM-2019M3A6B3030637, NRF-2019R1A5A8080290, NRF-2018M3D1A1058997) funded by the Ministry of Science and ICT (MSIT), Republic of Korea. J.K.K. acknowledges the National Creative Research Initiative program (NRF-2013R1A3A2042196) funded by the NRF-MSIT, Republic of Korea. M.K. acknowledges the NRF Global PhD fellowship (NRF-2017H1A2A1043204) funded by the Ministry of Education, Republic of Korea. Publisher Copyright: © 2020

PY - 2021/1

Y1 - 2021/1

N2 - An energy-free daytime radiative cooler based on silica-coated porous anodic aluminum oxide is proposed, optimized, and experimentally realized. It is shown that a simple thin silica layer coating on porous anodic aluminum oxide can produce the spectral emissivity in the atmospheric window (8-13μm) required for sub-ambient cooling effect under direct sunlight. The final design, optimized using effective medium theory, exhibits high reflectance of 0.86 in the solar spectral region, and a substantial average emissivity of 0.96 in the atmospheric window. The fabricated centimeter-scale radiative cooler demonstrates a maximum cooling of 6.1 °C below ambient during the daytime. We believe that the proposed approach is a promising way to produce inexpensive and efficient radiative coolers.

AB - An energy-free daytime radiative cooler based on silica-coated porous anodic aluminum oxide is proposed, optimized, and experimentally realized. It is shown that a simple thin silica layer coating on porous anodic aluminum oxide can produce the spectral emissivity in the atmospheric window (8-13μm) required for sub-ambient cooling effect under direct sunlight. The final design, optimized using effective medium theory, exhibits high reflectance of 0.86 in the solar spectral region, and a substantial average emissivity of 0.96 in the atmospheric window. The fabricated centimeter-scale radiative cooler demonstrates a maximum cooling of 6.1 °C below ambient during the daytime. We believe that the proposed approach is a promising way to produce inexpensive and efficient radiative coolers.

KW - Anodic aluminum oxide

KW - Atomic layer deposition

KW - Daytime

KW - Passive

KW - Radiative cooling

KW - Selective emitter

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U2 - 10.1016/j.nanoen.2020.105426

DO - 10.1016/j.nanoen.2020.105426

M3 - Article

AN - SCOPUS:85091650367

SN - 2211-2855

VL - 79

JO - Nano Energy

JF - Nano Energy

M1 - 105426

ER -

Sub-ambient daytime radiative cooling by silica-coated porous anodic aluminum oxide

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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