Commercial‐Like Self‐Cleaning Colored ZrO2‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling. Issue 10 (10th April 2022)

• Record Type: Journal Article
• Authors: Liu, Henghao; Kang, Hongjun; Jia, Xin; Qiao, Xianshu; Qin, Wei; Wu, Xiaohong
• Is Part Of: Advanced materials technologies. Volume 7:Issue 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-10
• Subjects: colored bilayer ZrO 2‐PVDF coating -- daytime sub‐ambient radiative cooling -- self‐cleaning -- weather resistance; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.202101583
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract: Passive daytime radiative cooling (PDRC) is a low‐carbon energy technology to early achieve the "carbon neutrality" goal. Developing the commercial‐like colored PDRC coatings with sub‐ambient cooling performance is still a big challenge. Herein, a colored bilayer ZrO2 ‐PVDF PDRC coating with sub‐ambient cooling performance, self‐cleaning, and good weather resistance property is first reported. The colored bilayer coating is composed of a thick ultra‐white ZrO2 ‐PVDF reflective layer ( R solar = 0.984) and a thin colorful layer. The obtained red bilayer ZrO2 ‐PVDF PDRC coating has a high solar reflectance ( R solar = 0.950), which could realize the maximum temperature drop of 3.0 °C, and the calculated theoretical cooling power is as high as 131.66 W m −2, showing a good sub‐ambient cooling performance. Furthermore, they show a good self‐cleaning property. Meanwhile, the accelerated aging tests prove that they have a good weather resistance. This work provides a low‐cost, simple, and large‐scale method to prepare the commercial‐like colored PDRC coatings with the sub‐ambient cooling performance, showing a great practical application value. Abstract : This work first reports a colored bilayer ZrO2 ‐PVDF passive daytime radiative cooling (PDRC) coating with sub‐ambient cooling performance, self‐cleaning, and good weather resistance property. The obtained red bilayer ZrO2 ‐PVDF PDRC coating has a high solar reflectance ( R solar = 0.950), which could realize the maximum temperature drop of 3.0 °C, showing a great practical application value in daytime sub‐ambient radiative cooling.