Spectrally Selective Solar Absorbers based on Ta:SiO             2             Cermets for Next‐Generation Concentrated Solar–Thermal Applications

Bilokur, M; Gentle, A; Arnold, MD; Cortie, MB; Smith, GB

Spectrally Selective Solar Absorbers based on Ta:SiO 2 Cermets for Next‐Generation Concentrated Solar–Thermal Applications

Bilokur, M Gentle, A

Arnold, MD Cortie, MB Smith, GB

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Publisher:: Wiley-VCH Verlag
Publication Type:: Journal Article
Citation:: Energy Technology: generation, conversion, storage, distribution, 2020, 8, (7)
Issue Date:: 2020-05-27

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Field	Value	Language
dc.contributor.author	Bilokur, M
dc.contributor.author	Gentle, A https://orcid.org/0000-0001-8964-0722
dc.contributor.author	Arnold, MD
dc.contributor.author	Cortie, MB
dc.contributor.author	Smith, GB
dc.date.accessioned	2020-10-30T03:10:39Z
dc.date.available	2021-08-12T19:00:49Z
dc.date.issued	2020-05-27
dc.identifier.citation	Energy Technology: generation, conversion, storage, distribution, 2020, 8, (7)
dc.identifier.issn	2194-4288
dc.identifier.issn	2194-4296
dc.identifier.uri	http://hdl.handle.net/10453/143604
dc.description.abstract	© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim An iterative algorithm is used to design a spectrally selective thin-film stack to provide maximum solar-to-thermal conversion efficiency at the very high operating temperatures associated with high solar concentrations. The resulting stack is then fabricated by magnetron sputtering and characterized. It is composed of two Ta:SiO2 layers with differing Ta nanoparticle contents on a refractory metal substrate. A SiO2 antireflecting overlayer completes the stack. Optical and microstructural characterizations indicate that the stack achieves 97.6% solar absorptance up to 900 °C. Spectral selectivity and thermal stability improve on annealing in two ways, first, due to recrystallization of Pt or Ta back reflectors which lowers room temperature thermal emittance to 0.15 from 0.18, and to 0.14 from 0.21, respectively; and second, due to alloying of substrate atoms with the Ta nanoparticles of the cermet.
dc.language	en
dc.publisher	Wiley-VCH Verlag
dc.relation	http://purl.org/au-research/grants/arc/DP140102003
dc.relation.ispartof	Energy Technology: generation, conversion, storage, distribution
dc.relation.isbasedon	10.1002/ente.202000125
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0904 Chemical Engineering, 0906 Electrical and Electronic Engineering, 0912 Materials Engineering
dc.title	Spectrally Selective Solar Absorbers based on Ta:SiO 2 Cermets for Next‐Generation Concentrated Solar–Thermal Applications
dc.type	Journal Article
utslib.citation.volume	8
utslib.for	0904 Chemical Engineering
utslib.for	0906 Electrical and Electronic Engineering
utslib.for	0912 Materials Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	open_access	*
pubs.consider-herdc	true
dc.date.updated	2020-10-30T03:10:31Z
pubs.issue	7
pubs.publication-status	Published online
pubs.volume	8
utslib.citation.issue	7

Abstract:

© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim An iterative algorithm is used to design a spectrally selective thin-film stack to provide maximum solar-to-thermal conversion efficiency at the very high operating temperatures associated with high solar concentrations. The resulting stack is then fabricated by magnetron sputtering and characterized. It is composed of two Ta:SiO2 layers with differing Ta nanoparticle contents on a refractory metal substrate. A SiO2 antireflecting overlayer completes the stack. Optical and microstructural characterizations indicate that the stack achieves 97.6% solar absorptance up to 900 °C. Spectral selectivity and thermal stability improve on annealing in two ways, first, due to recrystallization of Pt or Ta back reflectors which lowers room temperature thermal emittance to 0.15 from 0.18, and to 0.14 from 0.21, respectively; and second, due to alloying of substrate atoms with the Ta nanoparticles of the cermet.

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http://hdl.handle.net/10453/143604