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Spatiotemporal simulation of nickel oxide and carbon phases formation in solid oxide fuel cells (SOFC)

Neidhardt, Jonathan and Yurkiv, Vitaliy and Bessler, Wolfgang G. (2013) Spatiotemporal simulation of nickel oxide and carbon phases formation in solid oxide fuel cells (SOFC). FDFC 2013, April 16-18, 2013, Karlsruhe Germany.

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Abstract

The formation of secondary phases in the porous electrodes is a severe mechanism affecting the lifetime of solid oxide fuel cells (SOFC). It can occur via various chemical mechanisms and it has a significant influence on cell performance due to pore clogging and deactivation of active surfaces and triple-phase boundary (TPB). We present a modeling and simulation study of nickel oxide formation (reoxidation) and carbon formation (coking) within the SOFC anode. We use a 2D continuum model based on a multi-phase framework [Neidhardt et al., J. Electrochem. Soc., 159, 9 (2012)] that allows the introduction of arbitrary solid phases (here: Ni, YSZ, NiO, Carbon) plus gas phase. Reactions between the bulk phases are modeled via interface-adsorbed species and are described by an elementary kinetic approach. Published experimental data are used for parameterization and validation. Simulations allow the prediction of cell performance under critical operation conditions, like (i) a non-fuel operation test, where NiO formation is taking place (Figure 1a), or (ii) an open circuit voltage (OCV) stability test under hydrocarbon atmosphere, where solid carbon is formed (Figure 1b). Results are applied for enhanced interpretation of experimental data and for prediction of safe operation conditions.

Item URL in elib:https://elib.dlr.de/84933/
Document Type:Conference or Workshop Item (Poster)
Title:Spatiotemporal simulation of nickel oxide and carbon phases formation in solid oxide fuel cells (SOFC)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Neidhardt, JonathanJonathan.Neidhardt (at) dlr.deUNSPECIFIED
Yurkiv, Vitaliyvitaliy.yurkiv (at) dlr.deUNSPECIFIED
Bessler, Wolfgang G.HS OffenburgUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:SOFC, simulation, degradation, nickel oxide, carbon formation
Event Title:FDFC 2013
Event Location:Karlsruhe Germany
Event Type:international Conference
Event Dates:April 16-18, 2013
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 - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Neidhardt, Jonathan
Deposited On:05 Nov 2013 14:42
Last Modified:31 Jul 2019 19:42

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