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Modeling of solid oxide fuel cells with optimized interconnect designs

Zeng, Shumao; Zhang, Xiaoqiang; Song Chen, Jun; Li, Tingshuai and Andersson, Martin LU (2018) In International Journal of Heat and Mass Transfer 125. p.506-514
Abstract

A 3D model is developed to investigate solid oxide fuel cells (SOFCs) contacting with optimized interconnect designs and the results indicate that the current density and thermal stress are closely related to both the shape of tip in interconnects and the depth of it in the cathode. The interconnect with triangular rips can yield the best electrochemical performance compared to those with tips of rectangle and trapezium, and the current densities increase with the depth of tips in cathodes, except the trapezoidal ribs, which shows a concaving change with the depth. The 1st principle stress reaches around 21.9 MPa and 16.6 MPa at the interfaces of electrodes and electrolytes, but it rises to 60 MPa and 18 MPa for the rectangular tips at... (More)

A 3D model is developed to investigate solid oxide fuel cells (SOFCs) contacting with optimized interconnect designs and the results indicate that the current density and thermal stress are closely related to both the shape of tip in interconnects and the depth of it in the cathode. The interconnect with triangular rips can yield the best electrochemical performance compared to those with tips of rectangle and trapezium, and the current densities increase with the depth of tips in cathodes, except the trapezoidal ribs, which shows a concaving change with the depth. The 1st principle stress reaches around 21.9 MPa and 16.6 MPa at the interfaces of electrodes and electrolytes, but it rises to 60 MPa and 18 MPa for the rectangular tips at the air and fuel inlets, respectively, which sharply decreases to nearly 25 MPa and 10 MPa with the depth in cathodes approaching 5 μm. The maximum shear stresses are found to reach 34.4 MPa and 32.1 MPa at the two interfaces, and the triangular tips will induce the most intensive stresses at electrolyte-cathode interface. The resulting conclusions are beneficial to optimize interconnect design to improve the efficiency of current collection and also reduce the risk of generation of remarkable thermal stresses.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cathode, Interconnect, Interface, Solid oxide fuel cells, Thermal stress
in
International Journal of Heat and Mass Transfer
volume
125
pages
9 pages
publisher
Pergamon
external identifiers
  • scopus:85046169867
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2018.04.096
language
English
LU publication?
yes
id
3f913a2e-16f6-4c12-b551-5adda83713af
date added to LUP
2018-05-07 13:07:43
date last changed
2019-01-06 13:53:41
@article{3f913a2e-16f6-4c12-b551-5adda83713af,
  abstract     = {<p>A 3D model is developed to investigate solid oxide fuel cells (SOFCs) contacting with optimized interconnect designs and the results indicate that the current density and thermal stress are closely related to both the shape of tip in interconnects and the depth of it in the cathode. The interconnect with triangular rips can yield the best electrochemical performance compared to those with tips of rectangle and trapezium, and the current densities increase with the depth of tips in cathodes, except the trapezoidal ribs, which shows a concaving change with the depth. The 1st principle stress reaches around 21.9 MPa and 16.6 MPa at the interfaces of electrodes and electrolytes, but it rises to 60 MPa and 18 MPa for the rectangular tips at the air and fuel inlets, respectively, which sharply decreases to nearly 25 MPa and 10 MPa with the depth in cathodes approaching 5 μm. The maximum shear stresses are found to reach 34.4 MPa and 32.1 MPa at the two interfaces, and the triangular tips will induce the most intensive stresses at electrolyte-cathode interface. The resulting conclusions are beneficial to optimize interconnect design to improve the efficiency of current collection and also reduce the risk of generation of remarkable thermal stresses.</p>},
  author       = {Zeng, Shumao and Zhang, Xiaoqiang and Song Chen, Jun and Li, Tingshuai and Andersson, Martin},
  issn         = {0017-9310},
  keyword      = {Cathode,Interconnect,Interface,Solid oxide fuel cells,Thermal stress},
  language     = {eng},
  month        = {10},
  pages        = {506--514},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Modeling of solid oxide fuel cells with optimized interconnect designs},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.04.096},
  volume       = {125},
  year         = {2018},
}