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Electrochemical impedance spectroscopy of SOFC and SOEC stacks

Lang, Michael and Bohn, Corinna and Lemcke, Michelle Sophie and Pysik, Matthias and FU, Qingxi and Sun, Xiufu (2017) Electrochemical impedance spectroscopy of SOFC and SOEC stacks. In: Proceedings of the 13 th European SOFC and SOEC Forum, pp. 132-141. European Fuel Cell Forum. 13 th European SOFC & SOE Forum, 03. - 06.07.2018, Luzern, Schweiz. ISBN 978-3-905592-23-8

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The successful development of the solid oxide fuel/electrolysis cell technology requires high quality, reliable and reproducible test results which enable the proper understanding of the corresponding electrochemical processes. Especially the different resistances, the overvoltages under electrical current and the degradation mechanisms in the stacks are not well understood. In this context, temperature and fuel gas composition gradients along the cell area and along the height of the stack play an important role under operation. Electrochemical impedance spectroscopy (EIS) is a very useful tool in order to close this knowledge gap. Therefore, the paper focuses on the improvement of the understanding of the electrochemical behavior of SOC stack repeat units with focus on electrochemical impedance spectroscopy. Both, the fuel cell (SOFC) and the electrolysis (SOEC) operation are addressed. The corresponding results have been obtained within the European funded project “SOCTESQA” (Solid oxide cell and stack testing and quality assurance). The relevant issues and parameters which influence the quality of the EIS spectra are outlined. Moreover, the results of the spectra are discussed in terms of reproducibility among different test methods. This includes the validation of the low frequency impedances with the area specific resistances of the current-voltage curves. Both operating modes (SOFC and SOEC) are compared to each other. Additionally, the high frequency impedances are validated with high current interrupt (HCI) measurements. The results obtained by fitting of the spectra with an equivalent circuit are compared with theoretical calculations.

Item URL in elib:https://elib.dlr.de/120896/
Document Type:Conference or Workshop Item (Poster)
Title:Electrochemical impedance spectroscopy of SOFC and SOEC stacks
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lang, MichaelMichael.Lang (at) dlr.dehttps://orcid.org/0000-0001-7756-9658
Bohn, CorinnaCorinna.bohn (at) dlr.dehttps://orcid.org/0000-0002-5424-9827
Pysik, MatthiasMatthias.Pysik (at) dlr.deUNSPECIFIED
Date:July 2017
Journal or Publication Title:Proceedings of the 13 th European SOFC and SOEC Forum
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 132-141
Bucheli, Olivierforum@efcf.com
Spirig, Michaelforum@efcf.com
Publisher:European Fuel Cell Forum
Keywords:SOFC, SOEC, stack, EIS, electrochemical impedance spectroscopy, high current Interrupt, HCI mesurements, solid oxide fuel/electrolysis cell, resistance, overvoltage, Degradation mechanism
Event Title:13 th European SOFC & SOE Forum
Event Location:Luzern, Schweiz
Event Type:international Conference
Event Dates:03. - 06.07.2018
Organizer:European Fuel Cell Forum
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells), E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Bohn, Corinna
Deposited On:16 Jul 2018 18:41
Last Modified:31 Jul 2019 20:18

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