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Elementary Kinetic Numerical Simulation of Ni/YSZ SOFC Anode Performance Considering Sulfur Poisoning

Riegraf, Matthias and Schiller, Günter and Costa, Rémi and Friedrich, K. Andreas and Latz, Arnulf and Yurkiv, Vitaliy (2014) Elementary Kinetic Numerical Simulation of Ni/YSZ SOFC Anode Performance Considering Sulfur Poisoning. Journal of The Electrochemical Society, 162 (1), F65-F75. Electrochemical Society, Inc.. DOI: 10.1149/2.0471501jes ISSN 0013-4651

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Official URL: http://jes.ecsdl.org/content/162/1/F65.abstract

Abstract

An elementary kinetic model is developed and applied to explore the influence of sulfur poisoning on the behavior of solid oxide fuel cell (SOFC) anodes. A detailed multi-step reaction mechanism of sulfur formation and oxidation at Ni/YSZ anodes together with channel gas-flow, porous-media transport and elementary charge-transfer chemistry is established for SOFCs operating on H2/H2O mixtures with trace amounts of hydrogen sulfide (H2S). A thermodynamic and kinetic data set is compiled from various literature sources. The derived chemical model, validated against sulfur chemisorption isobars taken from literature, is used to analyze performance drops of SOFCs working under typical fuel cell operating conditions. Electrochemical results show that at relatively low H2S concentrations SOFC button-cell performance can be interpreted using chemical sulfur formation. However, when the concentration is sufficiently high, the inclusion of second stage degradation and triple-phase boundary reconstruction is necessary to describe the performance decrease. Additionally, it is shown that the sulfur surface coverage increases with increasing current density. In order to shed more light on advanced fundamental understanding of cell poisoning, sensitive analyses toward total anode resistance and sulfur coverage for different operating conditions were performed.

Item URL in elib:https://elib.dlr.de/92427/
Document Type:Article
Title:Elementary Kinetic Numerical Simulation of Ni/YSZ SOFC Anode Performance Considering Sulfur Poisoning
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Riegraf, MatthiasDLRUNSPECIFIED
Schiller, GünterDLRUNSPECIFIED
Costa, Rémiremi.costa (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Latz, Arnulfarnulf.latz (at) dlr.deUNSPECIFIED
Yurkiv, Vitaliyvitaliy.yurkiv (at) dlr.deUNSPECIFIED
Date:2014
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:162
DOI :10.1149/2.0471501jes
Page Range:F65-F75
Publisher:Electrochemical Society, Inc.
ISSN:0013-4651
Status:Published
Keywords:SOFC, degradation, sulfur poisoning, elementary kinetic modeling
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Riegraf, Matthias
Deposited On:26 Nov 2014 11:13
Last Modified:31 Jul 2019 19:49

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