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Cobalt oxide-based foams for thermochemical solar energy storage

Agrafiotis, Christos und Roeb, Martin und Sattler, Christian (2014) Cobalt oxide-based foams for thermochemical solar energy storage. CellMat 2014, 2014-10-22 - 2014-10-24, Dresden, Deutschland.

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Offizielle URL: http://www.dgm.de/dgm/cellmat/

Kurzfassung

Thermochemical Storage (TCS) of solar energy exploits the heat effects of reversible chemical reactions. Solar heat produced during on-sun operation of Concentrated Solar Power (CSP) plants is used to power an endothermic chemical reaction; if this reaction is completely reversible the thermal energy can be entirely recovered by the reverse reaction during off-sun operation. Among such possible reversible gas-solid chemical reactions, the utilization of a pair of reduction-oxidation (redox) reactions of solid oxides of multivalent metals can be directly coupled to CSP plants employing air as the heat transfer fluid. The concept of employing for this application ceramic foam structures made partially or entirely from the redox oxide materials has been set forth and implemented. The proposed concept combines the demonstrated capabilities of oxide redox pair materials for thermochemical cycling with the inherent heat transfer characteristics of foam structures and promotes them one step further to the development of an integrated receiver/reactor/heat exchanger configuration with enhanced heat storage characteristics. Thermo-Gravimetric Analysis experiments demonstrated that the redox pair of cobalt oxides Co3O4/CoO can operate in a completely reversible, cyclic redox mode within the temperature range 800-1000oC. In this respect at first Co3O4-coated ceramic foams were prepared and subsequently, promoting this idea one step further, the manufacture of ceramic foams entirely from Co3O4 was attempted successfully. Both Co3O4-coated, as well as foams made entirely of Co3O4 demonstrated cyclic, long-term redox operation, exploiting the entire amount of Co3O4 employed. However, such structures are subjected to “chemically”-induced stresses due to the expansion-contraction of the cobalt oxide lattice during oxygen release/uptake. Design issues concern optimizing their structure and density to maximize redox performance maintaining simultaneously their structural integrity. The results are used for the manufacture of such pilot-scale foam-based reactors/heat exchangers for testing on a solar simulator facility.

elib-URL des Eintrags:https://elib.dlr.de/91685/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Cobalt oxide-based foams for thermochemical solar energy storage
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Agrafiotis, Christoschristos.agrafiotis (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Roeb, MartinMartin.roeb (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sattler, Christianchristian.sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124NICHT SPEZIFIZIERT
Datum:22 Oktober 2014
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Cobaltoxide heat storage solar thermal
Veranstaltungstitel:CellMat 2014
Veranstaltungsort:Dresden, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:22 Oktober 2014
Veranstaltungsende:24 Oktober 2014
Veranstalter :Deutsche Gesellschaft für materialkunde
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:Konzentrierende Solarsysteme (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Solare Verfahrenstechnik (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Solarforschung > Solare Verfahrenstechnik
Hinterlegt von: Sattler, Prof. Dr. Christian
Hinterlegt am:10 Nov 2014 15:19
Letzte Änderung:24 Apr 2024 19:57

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