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Long-Term Behavior of a Solid Oxide Electrolyzer (SOEC) Stack

Lang, Michael and Raab, Sebastian and Lemcke, Michelle Sophie and Bohn, Corinna and Pysik, Matthias (2020) Long-Term Behavior of a Solid Oxide Electrolyzer (SOEC) Stack. Fuel Cells. Wiley. doi: 10.1002/fuce.201900245. ISSN 1615-6846.

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Official URL: https://onlinelibrary.wiley.com/doi/10.1002/fuce.201900245

Abstract

The successful market introduction of the solid oxide fuel/electrolysis cell technology for power-to-gas applications requires the reduction of the degradation rates and the better understanding of the degradation mechanisms of the stacks. Therefore, the paper reports and compares the long-term behavior of a solid oxide cell stack in electrolysis and reversible fuel cell/electrolysis operation. The 30-cell stack with electrolyte supported cells was supplied by Sunfire GmbH (Dresden/Germany) in the German funded RSOC Project. The stack was operated for 3370 h in electrolysis and afterwards for 2500 h in reversible fuel cell/electrolysis mode, each at 70 % gas conversion. In the beginning of the test, the stack showed high gas tightness, good performances and high efficiencies in both SOEC and SOFC operations. During 3370 h of SOEC operation a low degradation of +0.5 %/1000 h was measured. During 2500 h of reversible fuel cell/electrolysis cycling, the gas tightness of the stack slightly decreased, which led to a temperature increase, and higher degradation rates were observed. The increase of the ohmic resistance contributed mostly to the degradation. Optimized operating conditions for reversible cycling and increasing the purity of the supplied water are foreseen in order to minimize stack degradation in reversible operation.

Item URL in elib:https://elib.dlr.de/136558/
Document Type:Article
Additional Information:Eingeladener Beitrag zu einem Sonderband
Title:Long-Term Behavior of a Solid Oxide Electrolyzer (SOEC) Stack
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lang, MichaelMichael.Lang (at) dlr.dehttps://orcid.org/0000-0001-7756-9658
Raab, SebastianUNSPECIFIEDUNSPECIFIED
Lemcke, Michelle SophieUNSPECIFIEDUNSPECIFIED
Bohn, CorinnaUNSPECIFIEDhttps://orcid.org/0000-0002-5424-9827
Pysik, MatthiasUNSPECIFIEDUNSPECIFIED
Date:2020
Journal or Publication Title:Fuel Cells
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/fuce.201900245
Editors:
EditorsEmailEditor's ORCID iD
Stimming, UlrichTechnische Universität MünchenUNSPECIFIED
Publisher:Wiley
Series Name:Topical Issue on ‘‘HighTemperature Electrolysis using Solid Oxide Electrolyzer Cell
ISSN:1615-6846
Status:Published
Keywords:Solid Oxide Electrolysis (SOE), High Temperature Electrolysis (HTE), Fuel Cell, Solid Oxide Electrolysis Cell (SOEC), Solid Oxide Fuel Cell (SOFC), Stack, Hydrogen, Electrochemistry, Reversible Operation, Degradation, Electrochemical Impedance Spectroscopy (EIS)
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) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Lang, Dr. Michael
Deposited On:12 Oct 2020 16:02
Last Modified:23 Oct 2020 11:32

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