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Redox thermodynamics and phase composition in the system SrFeO3 − δ — SrMnO3 − δ

Vieten, Josua and Bulfin, Brendan and Senholdt, Marion and Roeb, Martin and Sattler, Christian and Schmücker, Martin (2017) Redox thermodynamics and phase composition in the system SrFeO3 − δ — SrMnO3 − δ. Solid State Ionics, 308, pp. 149-155. Elsevier. DOI: 10.1016/j.ssi.2017.06.014 ISSN 0167-2738

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Abstract

Perovskite oxides are considered promising redox materials for many fields of application, such as chemical looping processes for thermochemical air separation, oxygen pumping and fuel production, in particular considering a solar heat source. The large range of possible perovskite compositions can be extended by the synthesis of solid solutions between different perovskite phases. In this work, the solid solution formation in the system SrMn1 − xFexO3 − δ is evaluated, showing that SrFeO3 − δ and SrMnO3 − δ are miscible in any Ratio investigated. Moreover, redox thermodynamics were studied using a van't Hoff approach. It has been found that in mixed manganese ferrite perovskites, the reduction of Fe4+ is preferred over the reduction of Mn4+, leading to an increase in redox enthalpy and entropy when both species are reduced. Our findings allow the targeted synthesis of perovskites with superior redox properties for applications in chemical looping processes, as the redox thermodynamics are adjustable via variation of the Fe content.

Item URL in elib:https://elib.dlr.de/112951/
Document Type:Article
Title:Redox thermodynamics and phase composition in the system SrFeO3 − δ — SrMnO3 − δ
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Vieten, JosuaJosua.Vieten (at) dlr.deUNSPECIFIED
Bulfin, Brendanbrendan.bulfin (at) dlr.deUNSPECIFIED
Senholdt, Marionmarion.senholdt (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Schmücker, Martinmartin.schmuecker (at) dlr.deUNSPECIFIED
Date:20 June 2017
Journal or Publication Title:Solid State Ionics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:308
DOI :10.1016/j.ssi.2017.06.014
Page Range:pp. 149-155
Publisher:Elsevier
ISSN:0167-2738
Status:Published
Keywords:Thermochemical Cycles, concentrated solar Radiation, perovskites
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Institute of Materials Research > Structural and Functional ceramics
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:09 Aug 2017 10:09
Last Modified:11 Dec 2017 13:28

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