A Solution-Processed Inorganic Emitter with High Spectral Selectivity for Efficient Subambient Radiative Cooling in Hot Humid Climates

Chongjia Lin; Yang Li; Cheng Chi; Ye Seul Kwon; Jingyuan Huang; Zuoxu Wu; Jiongzhi Zheng; Gongze Liu; Chi Yan Tso; Christopher Y.H. Chao; Baoling Huang

doi:10.1002/adma.202109350

A Solution-Processed Inorganic Emitter with High Spectral Selectivity for Efficient Subambient Radiative Cooling in Hot Humid Climates

Chongjia Lin
, Yang Li
, Cheng Chi
, Ye Seul Kwon
, Jingyuan Huang
, Zuoxu Wu
, Jiongzhi Zheng
, Gongze Liu
, Chi Yan Tso
, Christopher Y.H. Chao
, Baoling Huang

Research output: Journal article publication › Journal article › Academic research › peer-review

167 Citations (Scopus)

Abstract

Daytime radiative cooling provides an eco-friendly solution to space cooling with zero energy consumption. Despite significant advances, most state-of-the-art radiative coolers show broadband infrared emission with low spectral selectivity, which limits their cooling temperatures, especially in hot humid regions. Here, an all-inorganic narrowband emitter comprising a solution-derived SiO_xN_y layer sandwiched between a reflective substrate and a self-assembly monolayer of SiO₂ microspheres is reported. It shows a high and diffusive solar reflectance (96.4%) and strong infrared-selective emittance (94.6%) with superior spectral selectivity (1.46). Remarkable subambient cooling of up to 5 °C in autumn and 2.5 °C in summer are achieved under high humidity without any solar shading or convection cover at noontime in a subtropical coastal city, Hong Kong. Owing to the all-inorganic hydrophobic structure, the emitter shows outstanding resistance to ultraviolet and water in long-term durability tests. The scalable-solution-based fabrication renders this stable high-performance emitter promising for large-scale deployment in various climates.

Original language	English
Article number	2109350
Journal	Advanced Materials
Volume	34
Issue number	12
DOIs	https://doi.org/10.1002/adma.202109350
Publication status	Published - 24 Mar 2022

UN SDGs

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

SDG 7 Affordable and Clean Energy
SDG 13 Climate Action

Keywords

cooling temperature
hot humid climates
inorganic emitters
selective thermal emission
subambient radiative cooling

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

More information

10.1002/adma.202109350

Cite this

@article{ae6fdcfbed10441b84b6509112d08a2b,

title = "A Solution-Processed Inorganic Emitter with High Spectral Selectivity for Efficient Subambient Radiative Cooling in Hot Humid Climates",

abstract = "Daytime radiative cooling provides an eco-friendly solution to space cooling with zero energy consumption. Despite significant advances, most state-of-the-art radiative coolers show broadband infrared emission with low spectral selectivity, which limits their cooling temperatures, especially in hot humid regions. Here, an all-inorganic narrowband emitter comprising a solution-derived SiOxNy layer sandwiched between a reflective substrate and a self-assembly monolayer of SiO2 microspheres is reported. It shows a high and diffusive solar reflectance (96.4\%) and strong infrared-selective emittance (94.6\%) with superior spectral selectivity (1.46). Remarkable subambient cooling of up to 5 °C in autumn and 2.5 °C in summer are achieved under high humidity without any solar shading or convection cover at noontime in a subtropical coastal city, Hong Kong. Owing to the all-inorganic hydrophobic structure, the emitter shows outstanding resistance to ultraviolet and water in long-term durability tests. The scalable-solution-based fabrication renders this stable high-performance emitter promising for large-scale deployment in various climates.",

keywords = "cooling temperature, hot humid climates, inorganic emitters, selective thermal emission, subambient radiative cooling",

author = "Chongjia Lin and Yang Li and Cheng Chi and Kwon, \{Ye Seul\} and Jingyuan Huang and Zuoxu Wu and Jiongzhi Zheng and Gongze Liu and Tso, \{Chi Yan\} and Chao, \{Christopher Y.H.\} and Baoling Huang",

note = "Funding Information: C.L. and Y.L. contributed equally to this work. This work was financially supported by the Bright Dream Robotics of Country Garden (Grant No. UB‐19.005). The authors also thank the support from the Hong Kong Research Grant Council (RGC) via General Research Fund (GRF) account Grant No. 16200518 and Collaborative Research Fund (CRF) account Grant No. C6022‐16G, respectively. This work was also supported in part by the Project of Hetao Shenzhen‐Hong Kong Science and Technology Innovation Cooperation Zone (HZQB‐KCZYB‐2020083). The authors thank Prof. Ronggui Yang at the Huazhong University of Science and Technology, China for the helpful discussions. Funding Information: C.L. and Y.L. contributed equally to this work. This work was financially supported by the Bright Dream Robotics of Country Garden (Grant No. UB-19.005). The authors also thank the support from the Hong Kong Research Grant Council (RGC) via General Research Fund (GRF) account Grant No. 16200518 and Collaborative Research Fund (CRF) account Grant No. C6022-16G, respectively. This work was also supported in part by the Project of Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone (HZQB-KCZYB-2020083). The authors thank Prof. Ronggui Yang at the Huazhong University of Science and Technology, China for the helpful discussions. Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",

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AU - Lin, Chongjia

AU - Li, Yang

AU - Chi, Cheng

AU - Kwon, Ye Seul

AU - Huang, Jingyuan

AU - Wu, Zuoxu

AU - Zheng, Jiongzhi

AU - Liu, Gongze

AU - Tso, Chi Yan

AU - Chao, Christopher Y.H.

AU - Huang, Baoling

N1 - Funding Information: C.L. and Y.L. contributed equally to this work. This work was financially supported by the Bright Dream Robotics of Country Garden (Grant No. UB‐19.005). The authors also thank the support from the Hong Kong Research Grant Council (RGC) via General Research Fund (GRF) account Grant No. 16200518 and Collaborative Research Fund (CRF) account Grant No. C6022‐16G, respectively. This work was also supported in part by the Project of Hetao Shenzhen‐Hong Kong Science and Technology Innovation Cooperation Zone (HZQB‐KCZYB‐2020083). The authors thank Prof. Ronggui Yang at the Huazhong University of Science and Technology, China for the helpful discussions. Funding Information: C.L. and Y.L. contributed equally to this work. This work was financially supported by the Bright Dream Robotics of Country Garden (Grant No. UB-19.005). The authors also thank the support from the Hong Kong Research Grant Council (RGC) via General Research Fund (GRF) account Grant No. 16200518 and Collaborative Research Fund (CRF) account Grant No. C6022-16G, respectively. This work was also supported in part by the Project of Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone (HZQB-KCZYB-2020083). The authors thank Prof. Ronggui Yang at the Huazhong University of Science and Technology, China for the helpful discussions. Publisher Copyright: © 2022 Wiley-VCH GmbH.

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Y1 - 2022/3/24

N2 - Daytime radiative cooling provides an eco-friendly solution to space cooling with zero energy consumption. Despite significant advances, most state-of-the-art radiative coolers show broadband infrared emission with low spectral selectivity, which limits their cooling temperatures, especially in hot humid regions. Here, an all-inorganic narrowband emitter comprising a solution-derived SiOxNy layer sandwiched between a reflective substrate and a self-assembly monolayer of SiO2 microspheres is reported. It shows a high and diffusive solar reflectance (96.4%) and strong infrared-selective emittance (94.6%) with superior spectral selectivity (1.46). Remarkable subambient cooling of up to 5 °C in autumn and 2.5 °C in summer are achieved under high humidity without any solar shading or convection cover at noontime in a subtropical coastal city, Hong Kong. Owing to the all-inorganic hydrophobic structure, the emitter shows outstanding resistance to ultraviolet and water in long-term durability tests. The scalable-solution-based fabrication renders this stable high-performance emitter promising for large-scale deployment in various climates.

AB - Daytime radiative cooling provides an eco-friendly solution to space cooling with zero energy consumption. Despite significant advances, most state-of-the-art radiative coolers show broadband infrared emission with low spectral selectivity, which limits their cooling temperatures, especially in hot humid regions. Here, an all-inorganic narrowband emitter comprising a solution-derived SiOxNy layer sandwiched between a reflective substrate and a self-assembly monolayer of SiO2 microspheres is reported. It shows a high and diffusive solar reflectance (96.4%) and strong infrared-selective emittance (94.6%) with superior spectral selectivity (1.46). Remarkable subambient cooling of up to 5 °C in autumn and 2.5 °C in summer are achieved under high humidity without any solar shading or convection cover at noontime in a subtropical coastal city, Hong Kong. Owing to the all-inorganic hydrophobic structure, the emitter shows outstanding resistance to ultraviolet and water in long-term durability tests. The scalable-solution-based fabrication renders this stable high-performance emitter promising for large-scale deployment in various climates.

KW - cooling temperature

KW - hot humid climates

KW - inorganic emitters

KW - selective thermal emission

KW - subambient radiative cooling

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DO - 10.1002/adma.202109350

M3 - Journal article

C2 - 35038775

AN - SCOPUS:85124524662

SN - 0935-9648

VL - 34

JO - Advanced Materials

JF - Advanced Materials

IS - 12

M1 - 2109350

ER -

A Solution-Processed Inorganic Emitter with High Spectral Selectivity for Efficient Subambient Radiative Cooling in Hot Humid Climates

Abstract

UN SDGs

Keywords

ASJC Scopus subject areas

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