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Study of Detailed Degradation Behavior of Solid Oxide Electrolyzer Cells (SOEC)

Schiller, Günter and Hörlein, Michael and Tietz, Frank and Friedrich, K. Andreas (2016) Study of Detailed Degradation Behavior of Solid Oxide Electrolyzer Cells (SOEC). International Conference and Exposition on Advanced Ceramics and Composites (ICACC2016) - 13th International Symposium on Solid Oxide Fuel Cells (SOFC): Materials, Science and Technology, 24.-29. Jan. 2016, Daytona Beach, FL, USA.

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Abstract

High temperature 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 the improvement of the degradation behavior by elucidating the relevant degradation mechanisms. Cathode-supported cells were fabricated by ceramic processing and sintering for electrochemical characterization in electrolysis operating mode. For a systematic investigation of the influence of the operating parameters temperature, fuel gas humidification and current density on SOEC long-term degradation a series of measurements over 1000 hours 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. The progress of degradation was monitored in-operando approximately every 150 h by impedance spectroscopy. Results of electrochemical cell characterization are shown and observed degradation phenomena and their underlying mechanisms based on different electrochemical processes are explained. Post-mortem investigations have been conducted to localize and identify the rate limiting processes and to clarify the correlation between degradation processes and operational parameters.

Item URL in elib:https://elib.dlr.de/103098/
Document Type:Conference or Workshop Item (Speech)
Title:Study of Detailed Degradation Behavior of Solid Oxide Electrolyzer Cells (SOEC)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schiller, Günterguenter.schiller (at) dlr.deUNSPECIFIED
Hörlein, Michaelmichael.hoerlein (at) dlr.deUNSPECIFIED
Tietz, Frankf.tietz (at) fz-juelich.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:26 January 2016
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:High temperature steam electrolysis, degradation behavior, long-term experiments, impedance spectroscopy, post-test analyses
Event Title:International Conference and Exposition on Advanced Ceramics and Composites (ICACC2016) - 13th International Symposium on Solid Oxide Fuel Cells (SOFC): Materials, Science and Technology
Event Location:Daytona Beach, FL, USA
Event Type:international Conference
Event Dates:24.-29. Jan. 2016
Organizer:Engineering Ceramics Division of The American Ceramic Society
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Electrolysis) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schiller, Dr.rer.nat. Günter
Deposited On:23 Feb 2016 09:39
Last Modified:31 Jul 2019 20:00

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