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A novel interconnect design of solid oxide fuel cell stacks to mitigate thermal and electrochemical imbalance

Lee, Wooseok and Lang, Michael and Costa, Rémi and Lee, In-sung and Lee, Young-Sang and Hong, Jongsup (2024) A novel interconnect design of solid oxide fuel cell stacks to mitigate thermal and electrochemical imbalance. Applied Energy. Elsevier. ISSN 0306-2619.

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Abstract

With the growing demand for eco-friendly energy to against the climate change, solid oxide fuel cell (SOFC) is gaining attraction. However, SOFC suffers from performance degradation during long-term operation due to various stresses that occur within the stack, which is a barrier to commercialization. Since the inhomogeneous operating environment generated during the practical operation is the main source of various stresses, we have proposed a new stack design (J. Kim, et al., 2021) to uniformize the inhomogeneous operating environment formed in the conventional crossflow type stack design (reference design). However, the computational model used in that previous study assumed electrochemical reactions as constants and did not consider charge conservation, which limits the prediction accuracy of the simulations. In addition, it mainly focuses on the heat transfer mechanism in the vertical direction of the entire stack and does not analyze various physical phenomena within a single repeating unit. In addition, there was a lack of explanation of how and why the new design was derived. The limitations and shortcomings of our previous work are addressed in this study. A detailed comparison of the reference and the new design in terms of temperature, chemical species and electrochemical reactions are performed based on three-dimensional multiphysics simulation. The electrochemical reaction kinetics are calculated by Butler-Volmer equation, and the charge conservations are computed to improve the reliability of the simulation results. Also, the detailed heat and mass transfer phenomena inside one repeating unit of the stack were analyzed. Furthermore, it was explained in detail how basic thermal and flow management principles were applied in the process of deriving the new design. The simulation results demonstrated that the new design operates in a more homogeneous environment compared to the reference design.

Item URL in elib:https://elib.dlr.de/203927/
Document Type:Article
Title:A novel interconnect design of solid oxide fuel cell stacks to mitigate thermal and electrochemical imbalance
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Lee, WooseokYonsei UniversityUNSPECIFIEDUNSPECIFIED
Lang, MichaelUNSPECIFIEDhttps://orcid.org/0000-0001-7756-9658UNSPECIFIED
Costa, RémiUNSPECIFIEDhttps://orcid.org/0000-0002-3534-1935UNSPECIFIED
Lee, In-sungUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, Young-SangE&KOAUNSPECIFIEDUNSPECIFIED
Hong, JongsupUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:2024
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:Elsevier
ISSN:0306-2619
Status:Accepted
Keywords:Solid oxide fuel cell; Thermal stress; Chemical stress; Interconnect design; Thermal management; Flow management
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Lang, Dr. Michael
Deposited On:29 May 2024 17:32
Last Modified:29 May 2024 17:32

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