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Detailed Study of Degradation Behavior of Solid Oxide Cells in Electrolysis and Co-Electrolysis Mode

Schiller, Günter und Hörlein, Michael und Nechache, Aziz (2016) Detailed Study of Degradation Behavior of Solid Oxide Cells in Electrolysis and Co-Electrolysis Mode. PRIME - Pacific Rim Meeting on Electrochemical and Solid-State Science 2016, 2016-10-02 - 2016-10-07, Honolulu, HI, USA.

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Kurzfassung

High temperature steam and co-electrolysis has a high potential for the efficient production of hydrogen or syngas. For a further development of this promising technology, development work on materials and cells as well as extensive operational experience is still needed. A main objective is to develop highly efficient and long-term stable cells and stacks using novel electrode materials and to improve the degradation behaviour by elucidating the relevant degradation mechanisms. Fuel electrode supported cells containing perovskite-type air electrodes were fabricated by ceramic processing and sintering techniques to be electrochemically characterized in electrolysis and co-electrolysis operating mode. I-V curves and electrochemical impedance spectra have been recorded for cell characterization. For a systematic investigation of the influence of relevant operating parameters such as temperature, current density and fuel gas humidification on long-term degradation a special test bench has been established which allows electrochemical characterization of 4 cells simultaneously under relevant SOEC conditions. This arrangement allows for variation of one distinct operating parameter while keeping other parameters strictly constant. A series of measurements over 1000 hours each in the temperature range 750-850 °C with different fuel gas humidity (40-80 mol%) and different current densities between 0 and 1.5 A/cm2 has been performed in steam electrolysis mode. Additionally, a second series of measurements has started in co-electrolysis mode at different operating temperatures and different steam-to-CO2 ratios. The progress of degradation was monitored in-operando approximately every 150 h by impedance spectroscopy. It was possible to differentiate different electrode processes, a mass transport limitation on the fuel electrode and the electrolyte resistance. Post-mortem investigations have been conducted to localize and identify the limiting processes and to clarify the correlation between degradation processes and operational parameters. In this paper the selection and preparation of electrode materials and the process of cell manufacturing as well as the experimental setup for cell characterization and long-term measurements are described. Results of electrochemical cell characterization performed at different operational conditions in electrolysis and co-electrolysis mode are shown and degradation phenomena observed and their underlying mechanisms based on different electrochemical processes are explained.

elib-URL des Eintrags:https://elib.dlr.de/106652/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Detailed Study of Degradation Behavior of Solid Oxide Cells in Electrolysis and Co-Electrolysis Mode
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schiller, GünterGuenter.Schiller (at) dlr.dehttps://orcid.org/0000-0001-5093-7625NICHT SPEZIFIZIERT
Hörlein, Michaelmichael.hoerlein (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Nechache, Azizaziz.nechache (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:5 Oktober 2016
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:High temperature steam electrolysis, high temperature co-electrolysis, SOEC, degradation behavior, long-term operation, impedance spectroscopy (EIS), post-test analyses, degradation mechanisms
Veranstaltungstitel:PRIME - Pacific Rim Meeting on Electrochemical and Solid-State Science 2016
Veranstaltungsort:Honolulu, HI, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:2 Oktober 2016
Veranstaltungsende:7 Oktober 2016
Veranstalter :Electrochemical Society ECS, Electrochemical Society of Japan, Korean Electrochemical Society
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Elektrolyse und Wasserstoff
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Elektrolyse) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Schiller, Dr.rer.nat. Günter
Hinterlegt am:19 Okt 2016 08:48
Letzte Änderung:24 Apr 2024 20:11

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