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A heterogeneous model for the MCFC cathode

Fontes, Eduardo; Fontes, Magnus LU and Simonsson, Daniel (1995) In Electrochimica Acta 40(11). p.1641-1651
Abstract
A steady state agglomerate model for the MCFC cathode which takes into account the heterogeneous structure of this porous electrode is presented. The resulting model equations are solved by means of the finite element method. Calculations have been performed on two different test structures and include the influence of kinetics, porosity, outer surface area and distribution of electrolyte film. Comparisons with the filmed agglomerate model show that it is possible to obtain excellent agreement between the polarisation curves predicted by the two different models if a uniform film is used in the simulations. The tortuosity in the filmed agglomerate model is used as a fitting parameter. Other effects that evolve in the heterogeneous model... (More)
A steady state agglomerate model for the MCFC cathode which takes into account the heterogeneous structure of this porous electrode is presented. The resulting model equations are solved by means of the finite element method. Calculations have been performed on two different test structures and include the influence of kinetics, porosity, outer surface area and distribution of electrolyte film. Comparisons with the filmed agglomerate model show that it is possible to obtain excellent agreement between the polarisation curves predicted by the two different models if a uniform film is used in the simulations. The tortuosity in the filmed agglomerate model is used as a fitting parameter. Other effects that evolve in the heterogeneous model due to variations in the local structure are not revealed in the pseudohomogeneous model. The effect of a non-uniform electrolyte film thickness was investigated by solving the problem for a structure with pore mouths filled by an electrolyte meniscus. Also the effect of an electrolyte meniscus between spherical agglomerates was investigated. (Less)
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organization
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Contribution to journal
publication status
published
subject
keywords
fuel cell, MCFC, gas diffusion electrodes, mathematical modelling, nickel oxide
in
Electrochimica Acta
volume
40
issue
11
pages
1641 - 1651
publisher
Pergamon
external identifiers
  • scopus:0039952516
ISSN
0013-4686
language
English
LU publication?
yes
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c348cac2-22ce-4bb3-adf6-bf6392888c9d (old id 1470850)
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http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TG0-3YS8B2S-5H-2&_cdi=5240&_user=745831&_orig=search&_coverDate=08%2F31%2F1995&_sk=999599988&view=c&wchp=dGLbVtb-zSkzk&md5=aab0b9260d55ec95be5a68bec3d35c07&ie=/sdarticle.pdf
date added to LUP
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2017-01-01 04:55:25
@article{c348cac2-22ce-4bb3-adf6-bf6392888c9d,
  abstract     = {A steady state agglomerate model for the MCFC cathode which takes into account the heterogeneous structure of this porous electrode is presented. The resulting model equations are solved by means of the finite element method. Calculations have been performed on two different test structures and include the influence of kinetics, porosity, outer surface area and distribution of electrolyte film. Comparisons with the filmed agglomerate model show that it is possible to obtain excellent agreement between the polarisation curves predicted by the two different models if a uniform film is used in the simulations. The tortuosity in the filmed agglomerate model is used as a fitting parameter. Other effects that evolve in the heterogeneous model due to variations in the local structure are not revealed in the pseudohomogeneous model. The effect of a non-uniform electrolyte film thickness was investigated by solving the problem for a structure with pore mouths filled by an electrolyte meniscus. Also the effect of an electrolyte meniscus between spherical agglomerates was investigated.},
  author       = {Fontes, Eduardo and Fontes, Magnus and Simonsson, Daniel},
  issn         = {0013-4686},
  keyword      = {fuel cell,MCFC,gas diffusion electrodes,mathematical modelling,nickel oxide},
  language     = {eng},
  number       = {11},
  pages        = {1641--1651},
  publisher    = {Pergamon},
  series       = {Electrochimica Acta},
  title        = {A heterogeneous model for the MCFC cathode},
  volume       = {40},
  year         = {1995},
}