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Lifetime and Performance Prediction of SOFC Anodes Operated with Trace Amounts of Hydrogen Sulfide

Riegraf, Matthias and Schiller, Günter and Costa, Rémi and Friedrich, K. Andreas and Latz, Arnulf and Yurkiv, Vitaliy (2015) Lifetime and Performance Prediction of SOFC Anodes Operated with Trace Amounts of Hydrogen Sulfide. In: ECS Conference on Electrochemical Energy Conversion & Storage with SOFC-XIV, 68 (1), pp. 1373-1382. SOFC XIV, 26.-31. Juli 2015, Glasgow, Schottland. doi: 10.1149/06801.1373ecst.

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An elementary kinetic model is developed to predict the influence of sulfur on Ni/YSZ anodes of solid oxide fuel cells (SOFC) performance. A multi-step reaction mechanism describing the formation and oxidation of sulfur on the Ni surface is coupled with gas transport in the channel and porous phase, and charge-transfer processes. A thermodynamic and kinetic data set of sulfur formation and oxidation is derived based upon various literature sources including a coverage-dependent description of the enthalpy of surface-adsorbed sulfur. The validity of the model is demonstrated on two SOFC operation modes, namely H2/H2O/H2S and CH4/H2/H2O/H2S fuel mixtures, at different operating conditions using various electrochemical literature experiments. The first concern is the influence of adsorbed sulfur on charge-transfer processes and the second concern is the effect of adsorbed sulfur on complex methane reforming chemistry. The results reveal that sulfur surface coverage increases with current density demonstrating a low sulfur oxidation rate.

Item URL in elib:https://elib.dlr.de/97910/
Document Type:Conference or Workshop Item (Speech)
Title:Lifetime and Performance Prediction of SOFC Anodes Operated with Trace Amounts of Hydrogen Sulfide
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
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
Journal or Publication Title:ECS Conference on Electrochemical Energy Conversion & Storage with SOFC-XIV
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1149/06801.1373ecst
Page Range:pp. 1373-1382
Series Name:ECS Transactions
Keywords:Elementary kinetic modeling, sulfur poisoning, Ni/YSZ anode, methane steam reforming
Event Title:SOFC XIV
Event Location:Glasgow, Schottland
Event Type:international Conference
Event Dates:26.-31. Juli 2015
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:31 Aug 2015 10:48
Last Modified:31 Jul 2019 19:54

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