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/ | |||||||||||||||||||||
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Document Type: | Article | |||||||||||||||||||||
Title: | Redox thermodynamics and phase composition in the system SrFeO3 − δ — SrMnO3 − δ | |||||||||||||||||||||
Authors: |
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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 (old) | |||||||||||||||||||||
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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