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Thermal stress analysis of sulfur deactivated solid oxide fuel cells

Zeng, Shumao; Parbey, Joseph; Yu, Guangsen; Xu, Min; Li, Tingshuai and Andersson, Martin LU (2018) In Journal of Power Sources 379. p.134-143
Abstract

Hydrogen sulfide in fuels can deactivate catalyst for solid oxide fuel cells, which has become one of the most critical challenges to stability. The reactions between sulfur and catalyst will cause phase changes, leading to increase in cell polarization and mechanical mismatch. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is thus used to investigate the polarization, temperature and thermal stress in a sulfur deactivated SOFC by coupling equations for gas-phase species, heat, momentum, ion and electron transport. The results indicate that sulfur in fuels can strongly affect the cell polarization and thermal stresses, which shows a sharp decrease in the vicinity of electrolyte... (More)

Hydrogen sulfide in fuels can deactivate catalyst for solid oxide fuel cells, which has become one of the most critical challenges to stability. The reactions between sulfur and catalyst will cause phase changes, leading to increase in cell polarization and mechanical mismatch. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is thus used to investigate the polarization, temperature and thermal stress in a sulfur deactivated SOFC by coupling equations for gas-phase species, heat, momentum, ion and electron transport. The results indicate that sulfur in fuels can strongly affect the cell polarization and thermal stresses, which shows a sharp decrease in the vicinity of electrolyte when 10% nickel in the functional layer is poisoned, but they remain almost unchanged even when the poisoned Ni content was increased to 90%. This investigation is helpful to deeply understand the sulfur poisoning effects and also benefit the material design and optimization of electrode structure to enhance cell performance and lifetimes in various hydrocarbon fuels containing impurities.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hydrogen sulfide, Polarization, Solid oxide fuel cell, Thermal stress
in
Journal of Power Sources
volume
379
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85041389725
ISSN
0378-7753
DOI
10.1016/j.jpowsour.2018.01.011
language
English
LU publication?
yes
id
ddd5b200-3c91-4cc6-920b-e7598b570363
date added to LUP
2018-02-15 12:25:13
date last changed
2018-08-12 04:42:30
@article{ddd5b200-3c91-4cc6-920b-e7598b570363,
  abstract     = {<p>Hydrogen sulfide in fuels can deactivate catalyst for solid oxide fuel cells, which has become one of the most critical challenges to stability. The reactions between sulfur and catalyst will cause phase changes, leading to increase in cell polarization and mechanical mismatch. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is thus used to investigate the polarization, temperature and thermal stress in a sulfur deactivated SOFC by coupling equations for gas-phase species, heat, momentum, ion and electron transport. The results indicate that sulfur in fuels can strongly affect the cell polarization and thermal stresses, which shows a sharp decrease in the vicinity of electrolyte when 10% nickel in the functional layer is poisoned, but they remain almost unchanged even when the poisoned Ni content was increased to 90%. This investigation is helpful to deeply understand the sulfur poisoning effects and also benefit the material design and optimization of electrode structure to enhance cell performance and lifetimes in various hydrocarbon fuels containing impurities.</p>},
  author       = {Zeng, Shumao and Parbey, Joseph and Yu, Guangsen and Xu, Min and Li, Tingshuai and Andersson, Martin},
  issn         = {0378-7753},
  keyword      = {Hydrogen sulfide,Polarization,Solid oxide fuel cell,Thermal stress},
  language     = {eng},
  month        = {03},
  pages        = {134--143},
  publisher    = {Elsevier},
  series       = {Journal of Power Sources},
  title        = {Thermal stress analysis of sulfur deactivated solid oxide fuel cells},
  url          = {http://dx.doi.org/10.1016/j.jpowsour.2018.01.011},
  volume       = {379},
  year         = {2018},
}