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Grading the amount of electrochemcial active sites along the main flow direction of an SOFC

Andersson, Martin LU ; Yuan, Jinliang LU and Sundén, Bengt LU (2013) In Journal of the Electrochemical Society 160(1). p.1-12
Abstract
A fully coupled computational fluid dynamics (CFD) approach based on the finite element method, in two-dimensions, is developed to describe a solid oxide fuel cell (SOFC). Both hydrogen and carbon monoxide are considered as electrochemical reactants within the anode. The dimensionless number of electrochemical active sites (EAS), the pore radius (indirectly proportional to the particle radius) and the active area-to-volume ratio available for methane reforming are graded, along the main flow direction, to equalize the current density distribution. Previous studies available in the open literature only considered grading in the direction normal to the main flow direction, in terms of porosity and tortuosity. It is found that grading the... (More)
A fully coupled computational fluid dynamics (CFD) approach based on the finite element method, in two-dimensions, is developed to describe a solid oxide fuel cell (SOFC). Both hydrogen and carbon monoxide are considered as electrochemical reactants within the anode. The dimensionless number of electrochemical active sites (EAS), the pore radius (indirectly proportional to the particle radius) and the active area-to-volume ratio available for methane reforming are graded, along the main flow direction, to equalize the current density distribution. Previous studies available in the open literature only considered grading in the direction normal to the main flow direction, in terms of porosity and tortuosity. It is found that grading the active area-to-volume ratio available for methane reforming increases the OCV along the main flow direction. It is concluded that an optimized graded EAS reduces the need of air flow rate with 21 %, with the same outlet temperatures as for the ungraded case. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
SOFC, Modeling, Cell scale, 2D, Grading, Dimensionless number of electrochemical active sites, Pore radius.
in
Journal of the Electrochemical Society
volume
160
issue
1
pages
1 - 12
publisher
The Electrochemical Society
external identifiers
  • wos:000313578400044
  • scopus:84873801693
ISSN
0013-4651
DOI
10.1149/2.026301jes
language
English
LU publication?
yes
id
774bbd6f-295f-4e34-8607-4ede9412828d (old id 3130527)
date added to LUP
2012-10-18 08:21:10
date last changed
2019-02-20 08:40:32
@article{774bbd6f-295f-4e34-8607-4ede9412828d,
  abstract     = {A fully coupled computational fluid dynamics (CFD) approach based on the finite element method, in two-dimensions, is developed to describe a solid oxide fuel cell (SOFC). Both hydrogen and carbon monoxide are considered as electrochemical reactants within the anode. The dimensionless number of electrochemical active sites (EAS), the pore radius (indirectly proportional to the particle radius) and the active area-to-volume ratio available for methane reforming are graded, along the main flow direction, to equalize the current density distribution. Previous studies available in the open literature only considered grading in the direction normal to the main flow direction, in terms of porosity and tortuosity. It is found that grading the active area-to-volume ratio available for methane reforming increases the OCV along the main flow direction. It is concluded that an optimized graded EAS reduces the need of air flow rate with 21 %, with the same outlet temperatures as for the ungraded case.},
  author       = {Andersson, Martin and Yuan, Jinliang and Sundén, Bengt},
  issn         = {0013-4651},
  keyword      = {SOFC,Modeling,Cell scale,2D,Grading,Dimensionless number of electrochemical active sites,Pore radius.},
  language     = {eng},
  number       = {1},
  pages        = {1--12},
  publisher    = {The Electrochemical Society},
  series       = {Journal of the Electrochemical Society},
  title        = {Grading the amount of electrochemcial active sites along the main flow direction of an SOFC},
  url          = {http://dx.doi.org/10.1149/2.026301jes},
  volume       = {160},
  year         = {2013},
}