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SOFC Modeling Considering Electrochemical Reactions at the Active Three Phase Boundaries

Andersson, Martin LU ; Yuan, Jinliang LU and Sundén, Bengt LU (2012) In International Journal of Heat and Mass Transfer 55(4-5). p.773-788
Abstract (Swedish)
Abstract in Undetermined

It is expected that fuel cells will play a significant role in a future sustainable energy system, due to their high energy efficiency and the possibility to use renewable fuels. A fully coupled CFD model (COMSOL Multiphysics) is developed to describe an intermediate temperature SOFC single cell, including governing equations for heat, mass, momentum and charge transport as well as kinetics considering the internal reforming and the electrochemical reactions. The influences of the ion and electron transport resistance within the electrodes, as well as the impact of the operating temperature and the cooling effect by the surplus of air flow, are investigated. As revealed for the standard case in this... (More)
Abstract in Undetermined

It is expected that fuel cells will play a significant role in a future sustainable energy system, due to their high energy efficiency and the possibility to use renewable fuels. A fully coupled CFD model (COMSOL Multiphysics) is developed to describe an intermediate temperature SOFC single cell, including governing equations for heat, mass, momentum and charge transport as well as kinetics considering the internal reforming and the electrochemical reactions. The influences of the ion and electron transport resistance within the electrodes, as well as the impact of the operating temperature and the cooling effect by the surplus of air flow, are investigated. As revealed for the standard case in this study, 90% of the electrochemical reactions occur within 2.4 mu m in the cathode and 6.2 mu m in the anode away from the electrode/electrolyte interface. In spite of the thin electrochemical active zone, the difference to earlier models with the reactions defined at the electrode-electrolyte interfaces is significant. It is also found that 60% of the polarizations occur in the anode, 10% in the electrolyte and 30% in the cathode. It is predicted that the cell current density increases if the ionic transfer tortuosity in the electrodes is decreased, the air flow rate is decreased or the cell operating temperature is increased. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CFD modeling, SOFC, Charge transport, Electrochemical reactions, TPB
in
International Journal of Heat and Mass Transfer
volume
55
issue
4-5
pages
773 - 788
publisher
Pergamon
external identifiers
  • wos:000300470200029
  • scopus:82955178698
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2011.10.032
language
English
LU publication?
yes
id
eff7caeb-9ae3-4d3b-99b8-70b8ed010d6c (old id 2173899)
date added to LUP
2011-10-20 09:25:46
date last changed
2017-11-12 03:09:13
@article{eff7caeb-9ae3-4d3b-99b8-70b8ed010d6c,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
It is expected that fuel cells will play a significant role in a future sustainable energy system, due to their high energy efficiency and the possibility to use renewable fuels. A fully coupled CFD model (COMSOL Multiphysics) is developed to describe an intermediate temperature SOFC single cell, including governing equations for heat, mass, momentum and charge transport as well as kinetics considering the internal reforming and the electrochemical reactions. The influences of the ion and electron transport resistance within the electrodes, as well as the impact of the operating temperature and the cooling effect by the surplus of air flow, are investigated. As revealed for the standard case in this study, 90% of the electrochemical reactions occur within 2.4 mu m in the cathode and 6.2 mu m in the anode away from the electrode/electrolyte interface. In spite of the thin electrochemical active zone, the difference to earlier models with the reactions defined at the electrode-electrolyte interfaces is significant. It is also found that 60% of the polarizations occur in the anode, 10% in the electrolyte and 30% in the cathode. It is predicted that the cell current density increases if the ionic transfer tortuosity in the electrodes is decreased, the air flow rate is decreased or the cell operating temperature is increased.},
  author       = {Andersson, Martin and Yuan, Jinliang and Sundén, Bengt},
  issn         = {0017-9310},
  keyword      = {CFD modeling,SOFC,Charge transport,Electrochemical reactions,TPB},
  language     = {eng},
  number       = {4-5},
  pages        = {773--788},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {SOFC Modeling Considering Electrochemical Reactions at the Active Three Phase Boundaries},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.10.032},
  volume       = {55},
  year         = {2012},
}