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Efficient Thin Polymer Coating as a Selective Thermal Emitter for Passive Daytime Radiative Cooling

Banik, Udayan and Agrawal, Ashutosh and Meddeb, Hosni and Sergeev, Oleg and Reininghaus, Nies and Götz-Köhler, Maximilian and Gehrke, Kai and Stührenberg, Jonas and Sznajder, Maciej and Agert, Carsten (2021) Efficient Thin Polymer Coating as a Selective Thermal Emitter for Passive Daytime Radiative Cooling. ACS Applied Materials and Interfaces. American Chemical society (ACS). doi: 10.1021/acsami.1c04056. ISSN 1944-8244.

[img] PDF - Postprint version (accepted manuscript)

Official URL: https://pubs.acs.org/doi/abs/10.1021/acsami.1c04056


Radiative cooling to subambient temperatures can be efficiently achieved through spectrally selective emission, which until now has only been realized by using complex nanoengineered structures. Here, a simple dip-coated planar polymer emitter derived from polysilazane, which exhibits strong selective emissivity in the atmospheric transparency window of 8–13 μm, is demonstrated. The 5 μm thin silicon oxycarbonitride coating has an emissivity of 0.86 in this spectral range because of alignment of the frequencies of bond vibrations arising from the polymer. Furthermore, atmospheric heat absorption is suppressed due to its low emissivity outside the atmospheric transparency window. The reported structure with the highly transparent polymer and underlying silver mirror reflects 97% of the incoming solar irradiation. A temperature reduction of 6.8 °C below ambient temperature was achieved by the structure under direct sunlight, yielding a cooling power of 93.7 W m–2. The structural simplicity, durability, easy applicability, and high selectivity make polysilazane a unique emitter for efficient prospective passive daytime radiative cooling structures.

Item URL in elib:https://elib.dlr.de/142271/
Document Type:Article
Title:Efficient Thin Polymer Coating as a Selective Thermal Emitter for Passive Daytime Radiative Cooling
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Banik, UdayanUNSPECIFIEDhttps://orcid.org/0000-0003-2605-2215UNSPECIFIED
Agrawal, AshutoshUNSPECIFIEDhttps://orcid.org/0000-0002-3277-5041UNSPECIFIED
Meddeb, HosniUNSPECIFIEDhttps://orcid.org/0000-0001-8939-7910UNSPECIFIED
Sergeev, OlegUNSPECIFIEDhttps://orcid.org/0000-0002-5022-6118UNSPECIFIED
Reininghaus, NiesUNSPECIFIEDhttps://orcid.org/0000-0002-9509-274XUNSPECIFIED
Götz-Köhler, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-6078-4359UNSPECIFIED
Gehrke, KaiUNSPECIFIEDhttps://orcid.org/0000-0002-0591-8289UNSPECIFIED
Stührenberg, JonasUNSPECIFIEDhttps://orcid.org/0000-0002-3777-2632UNSPECIFIED
Sznajder, MaciejUNSPECIFIEDhttps://orcid.org/0000-0002-9917-0581UNSPECIFIED
Agert, CarstenUNSPECIFIEDhttps://orcid.org/0000-0003-4733-5257UNSPECIFIED
Date:11 May 2021
Journal or Publication Title:ACS Applied Materials and Interfaces
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Chemical society (ACS)
Keywords:sub ambient radiative cooler, organopolysilazane, polymer derived coating, thin photonic emitter, silicon oxycarbonitride emitter
HGF - Research field:Energy
HGF - Program:Energy System Design
HGF - Program Themes:Digitalization and System Technology
DLR - Research area:Energy
DLR - Program:E SY - Energy System Technology and Analysis
DLR - Research theme (Project):E - Energy System Technology
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Urban and Residential Technologies
Institute of Networked Energy Systems > Energy Systems Analysis, OL
Institute of Space Systems > Mechanic and Thermal Systems
Deposited By: Banik, Udayan
Deposited On:25 May 2021 14:43
Last Modified:23 Oct 2023 08:40

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