The effect of interconnect rib size on the fuel cell concentration polarization in planar SOFCs

Zijing Lin, J. W. Stevenson, M. A. Khaleel

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The gas transport in the porous electrode is treated by a phenomenological approach such that the gas concentration at the three-phase boundary (TPB) region is the additive superposition of that transported from the source, i.e. the gas channels. With plausible approximations and elemental algebra, analytical expressions are obtained to estimate the effects of ribs on the concentration polarization of planar fuel cell operations. It is shown that the model can closely reproduce the experimental concentration polarization curve for small and medium current density (up to about 2A/cm2), providing a simple and effective method for engineering application. The concentration polarization caused by the presence of a rib is discussed and the concentration profiles with varying rib widths are illustrated. In connection with the electrical resistance, the determination of the optimal rib width for minimizing the overall polarization is also shown.

Original languageEnglish
Pages (from-to)92-97
Number of pages6
JournalJournal of Power Sources
Volume117
Issue number1-2
DOIs
Publication statusPublished - 15 May 2003
Externally publishedYes

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Keywords

  • Analytical model
  • Concentration polarization
  • Fuel cell
  • Gas transport
  • Rib design

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

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