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Study on Degradation of Solid Oxide Cells during Electrolysis and Co-Electrolysis Operation

Schiller, Günter and Costa, Rémi and Hörlein, Michael and Nechache, Aziz (2017) Study on Degradation of Solid Oxide Cells during Electrolysis and Co-Electrolysis Operation. 68th Annual Meeting of the International Society of Electrochemistry, 27.8.-1.9.2017, Providence, RI, USA.

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Abstract

High temperature steam and co-electrolysis have a high potential for the efficient production of hydrogen or syngas as energy carriers for a sustainable energy supply. 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 behavior by elucidating the relevant degradation mechanisms. In this paper we report a systematic investigation under relevant operating conditions such as temperature, fuel gas composition and current density on the long-term behavior of solid oxide cells. A special test bench allowing the electrochemical characterization of four cells simultaneously has been established. This arrangement allows for variation of one distinct operating parameter while keeping other parameters strictly constant. Fuel electrode and metal supported cells containing perovskite-type air electrodes fabricated by ceramic processing and sintering techniques have been electrochemically characterized in electrolysis and co-electrolysis operating mode by monitoring I-V curves and electrochemical impedance spectra. A series of measurements over at least 1000 hours each in the temperature range of 750-850 °C with different fuel gas compositions including different steam-to-carbon ratios and different current densities between 0 and 1.5 A/cm2 has been performed in steam electrolysis and co-electrolysis operating mode. The progress of degradation was monitored in-operando approximately every 150 h by impedance spectroscopy measurements. Post-test investigations have been conducted to link the changes in electrochemical behavior with the microstructural changes and to correlate them with operational pa-rameters. Results of electrochemical cell characterization performed at different operational conditions in electrolysis and co-electrolysis mode as well as on degradation phenomena observed are presented. Underlying mechanisms based on different electrochemical processes will be discussed.

Item URL in elib:https://elib.dlr.de/115450/
Document Type:Conference or Workshop Item (Speech)
Title:Study on Degradation of Solid Oxide Cells during Electrolysis and Co-Electrolysis Operation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schiller, GünterGuenter.Schiller (at) dlr.dehttps://orcid.org/0000-0001-5093-7625
Costa, Rémiremi.costa (at) dlr.dehttps://orcid.org/0000-0002-3534-1935
Hörlein, Michaelmichael.hoerlein (at) dlr.deUNSPECIFIED
Nechache, Azizaziz.nechache (at) dlr.deUNSPECIFIED
Date:1 September 2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Steam electrolysis, systematic degradation study, impedance spectroscopy, Long-term measurements, post-test analyses, co-electrolysis operation
Event Title:68th Annual Meeting of the International Society of Electrochemistry
Event Location:Providence, RI, USA
Event Type:international Conference
Event Dates:27.8.-1.9.2017
Organizer:International Society of Electrochemistry
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 13:15
Last Modified:31 Jul 2019 20:12

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