Electrochemical performance and stability of the cathode for solid oxide fuel cells

I. Cross validation of polarization measurements by impedance spectroscopy and current-potential sweep

X. D. Zhou, L. R. Pederson, J. W. Templeton, J. W. Stevenson

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The aim of this paper is to address three issues in solid oxide fuel cells (SOFC): (i) cross-validation of the polarization of a single cell measured using both dc and ac approaches, (ii) the precise determination of the total area specific resistance (ASR), and (iii) understanding cathode polarization with (La0.60 Sr0.40) (Co0.20 Fe0.80) O3 cathodes. The ASR of an SOFC is a dynamic property, meaning it changes with current density. The ASR measured using impedance spectroscopy (low frequency interception with the real Z′ -axis of the ac impedance spectrum) matches that measured from a dc current-voltage (i-E) sweep (the tangent of a dc i-E curve). Due to the dynamic nature of ASR, we found that an impedance spectrum measured under open-circuit voltage or on a half-cell may not represent the cathode performance under real operating conditions, particularly at a high current density. In this work, the electrode polarization was governed by the cathode activation polarization; the anode contribution was negligible.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume157
Issue number2
DOIs
Publication statusPublished - 2010
Externally publishedYes

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Cathodes
cathodes
Spectroscopy
impedance
Polarization
polarization
spectroscopy
Current density
current density
interception
Open circuit voltage
open circuit voltage
cells
tangents
dynamic characteristics
high current
Anodes
anodes

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

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AU - Pederson, L. R.

AU - Templeton, J. W.

AU - Stevenson, J. W.

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