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Thermal stress analysis of a planar anode-supported solid oxide fuel cell : Effects of anode porosity

Zeng, Shumao; Xu, Min; Parbey, Jeo; Yu, Guangsen; Andersson, Martin LU ; Li, Qiang; Li, Baihai and Li, Tingshuai (2017) In International Journal of Hydrogen Energy 42(31). p.20239-20248
Abstract

A Fuel cell is a highly efficient device for converting chemical energy in fuels to electrical energy and the electrical efficiency is strongly affected by the porosity in electrodes due to its close couplings with mass transfer and active sites for the electrochemical reactions, which will also cause changes in distribution of thermal stresses inside the electrodes. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is used to investigate the effects of porosity on polarizations, temperatures and thermal stresses by coupling equations for gas-phase species, heat, momentum, ion and electron transport. It was found that the porosity in the anode remarkably affected the exchange... (More)

A Fuel cell is a highly efficient device for converting chemical energy in fuels to electrical energy and the electrical efficiency is strongly affected by the porosity in electrodes due to its close couplings with mass transfer and active sites for the electrochemical reactions, which will also cause changes in distribution of thermal stresses inside the electrodes. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is used to investigate the effects of porosity on polarizations, temperatures and thermal stresses by coupling equations for gas-phase species, heat, momentum, ion and electron transport. It was found that the porosity in the anode remarkably affected the exchange current density and electrical current density, but it had an opposite effect on the anodic activation polarization compared to that in cathode. The first principle stress was enhanced from 0 to 2 MPa to 6-8 MPa by an increased anode porosity from 25% to 40%, and the increased porosity resulted in a decrease of the von mises stress along the main flow direction as well. The conclusions could be used to lay foundations for an improved performance and stabilization by optimizing electrode microstructures and by eliminating the stresses in electrodes.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Current density, Fuel cell, Polarization, Porosity, Thermal stress
in
International Journal of Hydrogen Energy
volume
42
issue
31
pages
20239 - 20248
publisher
Elsevier
external identifiers
  • scopus:85021770825
  • wos:000408180900066
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2017.05.189
language
English
LU publication?
yes
id
cf2bc0df-d3e0-4d17-8e4f-1f53b55840ae
date added to LUP
2017-07-20 12:15:15
date last changed
2018-08-12 04:38:07
@article{cf2bc0df-d3e0-4d17-8e4f-1f53b55840ae,
  abstract     = {<p>A Fuel cell is a highly efficient device for converting chemical energy in fuels to electrical energy and the electrical efficiency is strongly affected by the porosity in electrodes due to its close couplings with mass transfer and active sites for the electrochemical reactions, which will also cause changes in distribution of thermal stresses inside the electrodes. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is used to investigate the effects of porosity on polarizations, temperatures and thermal stresses by coupling equations for gas-phase species, heat, momentum, ion and electron transport. It was found that the porosity in the anode remarkably affected the exchange current density and electrical current density, but it had an opposite effect on the anodic activation polarization compared to that in cathode. The first principle stress was enhanced from 0 to 2 MPa to 6-8 MPa by an increased anode porosity from 25% to 40%, and the increased porosity resulted in a decrease of the von mises stress along the main flow direction as well. The conclusions could be used to lay foundations for an improved performance and stabilization by optimizing electrode microstructures and by eliminating the stresses in electrodes.</p>},
  author       = {Zeng, Shumao and Xu, Min and Parbey, Jeo and Yu, Guangsen and Andersson, Martin and Li, Qiang and Li, Baihai and Li, Tingshuai},
  issn         = {0360-3199},
  keyword      = {Current density,Fuel cell,Polarization,Porosity,Thermal stress},
  language     = {eng},
  number       = {31},
  pages        = {20239--20248},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {Thermal stress analysis of a planar anode-supported solid oxide fuel cell : Effects of anode porosity},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2017.05.189},
  volume       = {42},
  year         = {2017},
}