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Isothermal relaxation kinetics for the reduction and oxidation of SrFeO3 based perovskites

Bulfin, Brendan and Vieten, Josua and Richter, Sebastian and Naik, J. Madhusudhan and Patzke, Greta and Roeb, Martin and Sattler, Christian and Steinfeld, Aldo (2020) Isothermal relaxation kinetics for the reduction and oxidation of SrFeO3 based perovskites. Physical Chemistry Chemical Physics, 22, pp. 2466-2474. Royal Society of Chemistry. doi: 10.1039/C9CP05771D. ISSN 1463-9076.

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Official URL: https://pubs.rsc.org/en/content/articlelanding/2020/CP/C9CP05771D#!divAbstract


The perovskite oxide SrFeO3 has favourable redox properties for oxygen exchange applications, including oxygen separation and oxygen production chemical looping cycles. For such applications, lower temperature operation can improve the energy demand and feasibility of the process, but can also lead to kinetic limitations. Here we investigate the oxidation and reduction reaction kinetics of SrFeO3 in the temperature range 450–750 K. Isothermal relaxation techniques are used to observe the reaction rates across this temperature range, using a thermogravimetric analysis system. Experimental data are analysed according to an isoconversional method and fit with a simple power law model to extract activation energies. The apparent activation energy of oxidation and reduction was found to be 92 ± 16 and 144 ± 17 kJ mol−1 respectively. Comparison of oxidation and reduction kinetics together with considerations of particle size indicate that the oxidation reaction rate may be limited by diffusion in the bulk, while the reduction reaction rate is limited by the surface reaction. Furthermore, we also investigated the mixed perovskite Sr0.93Ca0.07Fe0.9Co0.1O3, which exhibited a 4-fold increase in the oxidation rate.

Item URL in elib:https://elib.dlr.de/135148/
Document Type:Article
Title:Isothermal relaxation kinetics for the reduction and oxidation of SrFeO3 based perovskites
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bulfin, BrendanETH Zürichhttps://orcid.org/0000-0001-9361-0075
Vieten, JosuaJosua.Vieten (at) dlr.dehttps://orcid.org/0000-0002-2060-2039
Richter, SebastianSebastian.Richter (at) dlr.deUNSPECIFIED
Naik, J. MadhusudhanUniversität Zürichhttps://orcid.org/0000-0001-8274-4158
Patzke, GretaUniversität Zürichhttps://orcid.org/0000-0003-4616-7183
Roeb, MartinMartin.roeb (at) dlr.dehttps://orcid.org/0000-0002-9813-5135
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Steinfeld, AldoETH Zürichhttps://orcid.org/0000-0001-7797-686X
Date:6 January 2020
Journal or Publication Title:Physical Chemistry Chemical Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1039/C9CP05771D
Page Range:pp. 2466-2474
Publisher:Royal Society of Chemistry
Keywords:Isothermal relaxation kinetics; perovskites; solar; thermochemistry
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
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:09 Oct 2020 10:36
Last Modified:09 Oct 2020 10:36

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