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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.0c21204. ISSN 1944-8244.

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

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Banik, UdayanUdayan.Banik (at) dlr.dehttps://orcid.org/0000-0003-2605-2215
Agrawal, AshutoshUNSPECIFIEDhttps://orcid.org/0000-0002-3277-5041
Meddeb, Hosnihosni.meddeb (at) dlr.dehttps://orcid.org/0000-0001-8939-7910
Sergeev, Olegoleg.sergeev (at) dlr.dehttps://orcid.org/0000-0002-5022-6118
Reininghaus, NiesNies.reininghaus (at) dlr.dehttps://orcid.org/0000-0002-9509-274X
Götz-Köhler, MaximilianMaximilian.Goetz (at) dlr.dehttps://orcid.org/0000-0002-6078-4359
Gehrke, KaiKai.Gehrke (at) dlr.dehttps://orcid.org/0000-0002-0591-8289
Stührenberg, JonasJonas.Stührenberg (at) dlr.dehttps://orcid.org/0000-0002-3777-2632
Sznajder, MaciejMaciej.Sznajder (at) dlr.dehttps://orcid.org/0000-0002-9917-0581
Agert, CarstenCarsten.Agert (at) dlr.dehttps://orcid.org/0000-0003-4733-5257
Date:11 May 2021
Journal or Publication Title:ACS Applied Materials and Interfaces
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1021/acsami.0c21204
Publisher:American Chemical society (ACS)
ISSN:1944-8244
Status:Published
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:01 Aug 2022 03:00

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