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  Redox Behavior of Solid Solutions in the SrFe1‐xCuxO3‐δ System for Application in Thermochemical Oxygen Storage and Air Separation

Vieten, J., Bulfin, B., Starr, D. E., Hariki, A., de Groot, F. M. F., Azarpira, A., et al. (2019). Redox Behavior of Solid Solutions in the SrFe1‐xCuxO3‐δ System for Application in Thermochemical Oxygen Storage and Air Separation. Energy Technology, 7(1), 131-139. doi:10.1002/ente.201800554.

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 Creators:
Vieten, Josua1, Author
Bulfin, Brendan2, Author
Starr, David E.3, Author
Hariki, Atsushi4, Author
de Groot, Frank M. F.5, Author
Azarpira, Anahita3, Author
Zachäus, Carolin3, Author
Hävecker, Michael6, Author              
Skorupska, Katarzyna6, Author              
Knoblauch, Nicole7, Author
Schmücker, Martin7, Author
Roeb, Martin1, Author
Sattler, Christian1, Author
Affiliations:
1Institute of Solar Research, Deutsches Zentrum für Luft- und Raumfahrt (DLR) e.V., Linder Höhe, D-51147 Köln, Germany, ou_persistent22              
2Professorship of Renewable Energy Carriers, ETH Zurich, Sonneggstr. 3, CH-8092 Zurich, Switzerland, ou_persistent22              
3Institute of Solar Fuels, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany, ou_persistent22              
4Institute for Solid State Physics, TU Wien, A-1040 Wien, Austria, ou_persistent22              
5Inorganic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands, ou_persistent22              
6Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
7Institute of Materials Research, Deutsches Zentrum für Luft- und Raumfahrt (DLR) e.V., Linder Höhe, D-51147 Köln, Germany, ou_persistent22              

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 Abstract: Perovskite oxides with temperature and oxygen partial pressure dependent non‐stoichiometry δ, such as SrFeO3‐δ or its Cu‐doped variants, can be applied as redox materials for two‐step thermochemical processes, i.e. to reversibly store oxygen and thereby thermal energy, or separate air using concentrated solar power. We studied the redox state of Cu in SrFe1‐xCuxO3‐δ samples using in‐situ X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption (XAS) measurements in oxygen atmospheres using synchrotron radiation, and characterized these materials through thermogravimetric analysis. By this means, we show how spectroscopic and thermogravimetric data are correlated, suggesting that Cu and Fe are reduced simultaneously for x = 0.05, whereas the reduction of samples with x = 0.15 is mainly driven by a change in the Fe oxidation state. Furthermore, we studied the re‐oxidation kinetics of reduced SrFe1‐xCuxO3‐δ, revealing very high reaction speeds with t1/2=13 min at 150 °C for SrFeO3‐δ. Our results indicate that SrFe1‐xCuxO3‐δ solid solutions can be applied for oxygen storage and air separation with high capacity at relatively low temperatures, which allows an efficient thermochemical process.

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Language(s): eng - English
 Dates: 2018-06-252018-07-022019-01
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/ente.201800554
 Degree: -

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Title: Energy Technology
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 9 Volume / Issue: 7 (1) Sequence Number: - Start / End Page: 131 - 139 Identifier: ISSN: 2194-4296
CoNE: https://pure.mpg.de/cone/journals/resource/21944296