An experimental investigation of pressurized planar solid oxide fuel cells using two different flow distributors

H. W. Chang, C. M. Huang, S. S. Shy

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A high-pressure high-temperature dual-chamber facility is established for electrochemical impedance measurements of pressurized solid oxide fuel cells (PSOFC) to explain why and how the cell performance is increased with increasing pressure (p). By comparing two sets of nearly identical single-cell stacks except using different flow distributors with different degrees of flow uniformity at 850 C over a range of p varying from 0.1 MPa to 0.5 MPa, we found that the better flow uniformity in flow distributors is, the better the cell performance is, and such performance enhancement is increased with increasing p. This finding is explained by impedance spectra and their associated equivalent circuit models, showing the coupling impact of flow uniformity and pressure elevation to the decrease of ohmic and polarization resistances. These results should be useful to the development of PSOFC integrating with micro gas turbines for future stationary power generation.

Original languageEnglish
Pages (from-to)21-29
Number of pages9
JournalJournal of Power Sources
Volume250
DOIs
StatePublished - 2014

Keywords

  • Cell performance
  • Electrochemical impedance spectra
  • Flow distributors
  • Flow uniformity
  • Ohmic and polarization resistances
  • Pressurized solid oxide fuel cell

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