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Degradation of Solid Oxide Cells During Electrolysis and Co-Electrolysis Operation

Schiller, Günter and Hörlein, Michael and Costa, Rémi and Nechache, Aziz (2017) Degradation of Solid Oxide Cells During Electrolysis and Co-Electrolysis Operation. In: Programme & Abstract Book 7th World Hydrogen Technology Convention. CZECH-IN. 7th World Hydrogen Technology Convention, 9.-12. Juli 2017, Prag, Tschechien.

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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. 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 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.

Item URL in elib:https://elib.dlr.de/115459/
Document Type:Conference or Workshop Item (Poster)
Title:Degradation of Solid Oxide Cells During Electrolysis and Co-Electrolysis Operation
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schiller, GünterGuenter.Schiller (at) dlr.dehttps://orcid.org/0000-0001-5093-7625
Hörlein, Michaelmichael.hoerlein (at) dlr.deUNSPECIFIED
Costa, Rémiremi.costa (at) dlr.dehttps://orcid.org/0000-0002-3534-1935
Nechache, Azizaziz.nechache (at) dlr.deUNSPECIFIED
Date:July 2017
Journal or Publication Title:Programme & Abstract Book 7th World Hydrogen Technology Convention
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Steam electrolysis, co-electrolysis, long-term measurements, degradation study, post-test analyses
Event Title:7th World Hydrogen Technology Convention
Event Location:Prag, Tschechien
Event Type:international Conference
Event Dates:9.-12. Juli 2017
Organizer:International Association for Hydrogen Energy (IAHE)
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schiller, Dr.rer.nat. Günter
Deposited On:01 Dec 2017 13:45
Last Modified:31 Jul 2019 20:12

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