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Redox thermochemistry of Ca-Mn-based perovskites for oxygen atmosphere control in solar-thermochemical processes

Pein, Mathias and Agrafiotis, Christos and Vieten, Josua and Gisafaki, Dimitra and Brendelberger, Stefan and Roeb, Martin and Sattler, Christian (2020) Redox thermochemistry of Ca-Mn-based perovskites for oxygen atmosphere control in solar-thermochemical processes. Solar Energy, 198, pp. 612-622. Elsevier. doi: 10.1016/j.solener.2020.01.088. ISSN 0038-092X.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0038092X20300955?via%3Dihub#!


Sustainable energy supply is a crucial issue in times of climate change and receding fossil energy reserves. The emerging field of solar-driven thermochemical H2O and CO2 splitting cycles is a very promising approach to address this challenge. Providing low oxygen partial pressures is crucial in these processes. This issue is tackled by either high vacuum pumping or inert-gas sweeping. Both techniques come with a rather high energy penalty, leading to lower efficiencies of the whole process. Thermochemical oxygen pumping offers great potential to efficiently reduce oxygen partial pressures in these splitting cycles. In this work a material investigation campaign focusing on earth-abundant, cheap and non-toxic perovskites is presented. The experimental results are complemented with an approach to correlate this performance to inherent material properties, and in particular to the tolerance factor. In this framework, Ca-Mn-based perovskite compositions were demonstrated to function effectively as combined thermochemical oxygen-pumping and energy storage materials. Not only an almost two-fold increase of the reduction extent of ceria as a water splitting material was achieved due to the operation of perovskites as oxygen pumping materials, but this increase was rendered three-fold by applying a suitable temperature swing operation strategy. In parallel, the perovskites’ energy storage density can be significantly increased by exploiting specific phase transitions that can be rationally explained via the Goldschmidt tolerance factor. Hence, the work offers a novel approach to reach low oxygen partial pressures with minimal energy penalties and a derived model to evaluate occurring phase transitions and their corresponding heat effects.

Item URL in elib:https://elib.dlr.de/135155/
Document Type:Article
Title:Redox thermochemistry of Ca-Mn-based perovskites for oxygen atmosphere control in solar-thermochemical processes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Pein, MathiasMathias.Pein (at) dlr.deUNSPECIFIED
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
Vieten, JosuaJosua.Vieten (at) dlr.dehttps://orcid.org/0000-0002-2060-2039
Brendelberger, StefanStefan.Brendelberger (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.dehttps://orcid.org/0000-0002-9813-5135
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:1 March 2020
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2020.01.088
Page Range:pp. 612-622
Keywords:Thermochemical cycles Redox oxides Perovskites Thermochemical oxygen pumping Thermochemical storage
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 10:34
Last Modified:23 Feb 2021 12:20

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