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Investigation of the Long-term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co-electrolysis Mode

Riedel, Marc und Heddrich, Marc P. und Friedrich, Kaspar Andreas (2020) Investigation of the Long-term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co-electrolysis Mode. Fuel Cells. Wiley. doi: 10.1002/fuce.202000011. ISSN 1615-6846.

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Offizielle URL: https://onlinelibrary.wiley.com/doi/epdf/10.1002/fuce.202000011

Kurzfassung

In this study three identically constructed ten-layer stacks with electrolyte supported cells were tested in exothermic steam and co-electrolysis mode at elevated pressures of 1.4 and 8 bar. Investigations during constant current operation at a current density of –0.5A cm–2 and a reactant conversion of 70% over 1,000–2,000 h were carried out. The inlet gas composition for steam electrolysis was 90/10 (H2O/H2) and 63.7/31.3/3.3/1.7 (H2O/CO2/H2/CO) for co-electrolysis operation. All stacks showed highly similar resistances at the beginning of the tests indicating a high level of accuracy and repeatability during manufacturing. The stack operated in steam electrolysis mode at 1.4 bar showed comparably low degradation of 8mV kh–1 cell–1, whereas the stack operated at 8 bar showed an approximately four times higher degradaion. The third stack was operated in co-electrolysis mode at 1.4 and 8 bar and showed noticeably higher degradation rates than during steam electrolysis mode. The predominant increase of the ohmic resistance during operation was identified to be mainly responsible for the observed degradation of all three stacks, whereas the increase of the polarization resistances played a subordinate role. Within the post-test analysis, noticeably high nickel depletion was observed for the stack operated at the highest pressure in steam electrolysis mode. Furthermore, partial delamination of electrodes was observed. The degradation is discussed with relation to phenomena and experimental parameters during operation.

elib-URL des Eintrags:https://elib.dlr.de/136942/
Dokumentart:Zeitschriftenbeitrag
Titel:Investigation of the Long-term Stability of Solid Oxide Electrolysis Stacks under Pressurized Conditions in Exothermic Steam and Co-electrolysis Mode
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Riedel, MarcMarc.Riedel (at) dlr.dehttps://orcid.org/0000-0001-8823-6760NICHT SPEZIFIZIERT
Heddrich, Marc P.Marc.Heddrich (at) dlr.dehttps://orcid.org/0000-0002-7037-0870NICHT SPEZIFIZIERT
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:1 September 2020
Erschienen in:Fuel Cells
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1002/fuce.202000011
Verlag:Wiley
ISSN:1615-6846
Status:veröffentlicht
Stichwörter:Degradation, Pressure, Solid Oxide Electrolysis Cell, SOEC, 10-cell Stack
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Elektrolyse und Wasserstoff
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Elektrolyse) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Riedel, Marc
Hinterlegt am:04 Dez 2020 14:30
Letzte Änderung:23 Okt 2023 12:23

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