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Understanding the Current-Voltage Behavior of High Temperature Solid Oxide Fuel Cell Stacks

Lang, Michael and Bohn, Corinna and Henke, Moritz and Schiller, Günter and Willich, Caroline and Hauler, Felix (2017) Understanding the Current-Voltage Behavior of High Temperature Solid Oxide Fuel Cell Stacks. Journal of The Electrochemical Society, 164 (13), F1460-F1470. Electrochemical Society, Inc.. DOI: 10.1149/2.1541713jes ISSN 0013-4651

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Abstract

High temperature solid oxide fuel cell (SOFC) stacks are highly efficient and environmentally friendly electrochemical systems, which convert the chemical energy of fuel gases with oxygen from air directly into electrical energy. During operation of SOFC stacks under system operating conditions pronounced temperature and fuel gas composition gradients along the cell area and along the height of the stack occur. Therefore, in contrast to SOFC cells, the electrochemical behavior of SOFC stacks is much more complex and has not sufficiently been studied. Specially, a shortcoming exists in terms of understanding the homogeneity, performance loss mechanisms, and various resistances and overvoltages within the stack repeat components. Therefore, this paper focuses on the improvement of the understanding and of the interpretation of different current-voltage curves of solid oxide fuel cell stack repeat units. Three different cases are discussed: repeat units with high power performance, with high cell contact resistance and with high fuel utilization. The stacks were investigated by current-voltage curves, electrochemical impedance spectroscopy and gas analysis. In order to understand the electrochemical behavior of these three cases both experimental and modeling results are presented, compared and discussed.

Item URL in elib:https://elib.dlr.de/115104/
Document Type:Article
Title:Understanding the Current-Voltage Behavior of High Temperature Solid Oxide Fuel Cell Stacks
Authors:
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
Henke, Moritzmoritz.henke (at) dlr.deUNSPECIFIED
Schiller, GünterGuenter.Schiller (at) dlr.dehttps://orcid.org/0000-0001-5093-7625
Willich, CarolineUNSPECIFIEDUNSPECIFIED
Hauler, Felixelringklinger agUNSPECIFIED
Date:27 October 2017
Journal or Publication Title:Journal of The Electrochemical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:164
DOI :10.1149/2.1541713jes
Page Range:F1460-F1470
Editors:
EditorsEmail
Savinell, Robertrfs2@case.edu
Publisher:Electrochemical Society, Inc.
Series Name:J. Electrochem. Soc. 2017
ISSN:0013-4651
Status:Published
Keywords:Electrochemistry, Solid oxide fuel cell, stack, SOFC, current voltage curve, repeat unit, cell contact resistance, fuel utilization, EIS, electrochemical impedance spectroscopy, gas Analysis, modeling,
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)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Bohn, Corinna
Deposited On:19 Dec 2017 18:45
Last Modified:23 Feb 2019 00:22

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