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Redox Oxides-Based Solar Thermochemistry and Its Materialization to Reactor/Heat Exchanger Concepts for Efficient Solar Energy Harvesting, Transformation and Storage

Agrafiotis, Christos and Pein, Mathias and Giasafakis, Dimitra and Tescari, Stefania and Roeb, Martin and Sattler, Christian (2019) Redox Oxides-Based Solar Thermochemistry and Its Materialization to Reactor/Heat Exchanger Concepts for Efficient Solar Energy Harvesting, Transformation and Storage. Journal of Solar Energy Engineering, 141, 021010-1. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4042226 ISSN 0199-6231

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Official URL: https://asmedigitalcollection.asme.org/solarenergyengineering/article/doi/10.1115/1.4042226/368779/Redox-OxidesBased-Solar-Thermochemistry-and-Its

Abstract

Ca-Mn-based perovskites doped in their A- and B-site were synthesized and comparatively tested versus the Co3O4/CoO and (Mn,Fe)2O3/(Mn,Fe)3O4 redox pairs with respect to thermochemical storage and oxygen pumping capability, as a function of the kind and extent of dopant. The perovskites' induced heat effects measured via differential scanning calorimetry are substantially lower: the highest reaction enthalpy recorded by the CaMnO3–δ composition was only 14.84 kJ/kg compared to 461.1 kJ/kg for Co3O4/CoO and 161.0 kJ/kg for (Mn,Fe)2O3/(Mn,Fe)3O4. Doping of Ca with increasing content of Sr decreased these heat effects; more than 20 at % Sr eventually eliminated them. Perovskites with Sr instead of Ca in the A-site exhibited also negligible heat effects, irrespective of the kind of B site cation. On the contrary, perovskite compositions characterized by high oxygen release/uptake can operate as thermochemical oxygen pumps enhancing the performance of water/carbon dioxide splitting materials. Oxygen pumping via Ca0.9Sr0.1MnO3–δ and SrFeO3–δ doubled and tripled, respectively, the total oxygen absorbed by ceria during its re-oxidation versus that absorbed without their presence. Such effective pumping compositions exhibited practically no shrinkage during one heat-up/cool-down cycle. However, they demonstrated an increase of the coefficient of linear expansion due to the superposition of “chemical expansion” to thermal-only one, the effect of which on the long-term dimensional stability has to be further quantified through extended cyclic operation.

Item URL in elib:https://elib.dlr.de/131103/
Document Type:Article
Title:Redox Oxides-Based Solar Thermochemistry and Its Materialization to Reactor/Heat Exchanger Concepts for Efficient Solar Energy Harvesting, Transformation and Storage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
Pein, MathiasMathias.Pein (at) dlr.deUNSPECIFIED
Giasafakis, Dimitrad.giasafaki (at) inn.demokritos.grUNSPECIFIED
Tescari, StefaniaStefania.Tescari (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:8 January 2019
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:141
DOI :10.1115/1.4042226
Page Range:021010-1
Editors:
EditorsEmail
Kodama, TatsuyaUNSPECIFIED
Sattler, ChristianUNSPECIFIED
Siegel, NathanUNSPECIFIED
Stechel, EllenUNSPECIFIED
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0199-6231
Status:Published
Keywords:thermochemical cycles, redox oxides, thermochemical storage, thermochemical oxygen pumping, 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
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:22 Nov 2019 15:40
Last Modified:22 Nov 2019 15:40

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