Performance of lanthanum strontium manganite electrodes at high pressure

E. C. Thomsen, G. W. Coffey, L. R. Pederson, O. A. Marina

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The high-pressure performance of lanthanum strontium manganite (LSM), LSM-zirconia, and LSM/ceria composite electrodes was studied by impedance spectroscopy and dc methods. Electrode resistances decreased in proportion to P(O2)1/2 for the LSM electrode in both cathodic and anodic directions to at least 10 MPa (∼100 atm), a decrease that was attributed to dissociative oxygen adsorption and related phenomena. For the LSM-20/zirconia composite electrode, resistances decreased in proportion to P(O2)1/4 across the entire pressure range considered. Two principal features appeared in the impedance spectra, one that showed a P(O2)1/4 dependence attributed to charge transfer reactions, and a smaller feature that was nearly pressure-independent, possibly due to transport in the zirconia portion of the composite. For the LSM-20/ceria composite electrode, resistances decreased as P(O2)0.3-0.4 at high pressure, depending on temperature. Two features appeared in the impedance spectra: one at low to intermediate frequency having a ∼P(O2)1/2 dependence and a second at high frequency having a ∼P(O2)1/4 dependence. These features are attributed to dissociative oxygen adsorption and to charge transfer reactions, respectively. Results suggest that cathodic losses can be substantially lowered by operation of solid oxide fuel cells at greater than ambient pressure.

Original languageEnglish
Pages (from-to)217-224
Number of pages8
JournalJournal of Power Sources
Volume191
Issue number2
DOIs
Publication statusPublished - 15 Jun 2009
Externally publishedYes

Fingerprint

Lanthanum
Strontium
lanthanum
strontium
Electrodes
electrodes
zirconium oxides
Zirconia
composite materials
Cerium compounds
Composite materials
impedance
Charge transfer
proportion
charge transfer
Oxygen
Adsorption
adsorption
intermediate frequencies
oxygen

Keywords

  • Cathode
  • Lanthanum manganite
  • LSM
  • Oxygen electrode
  • Pressure
  • Solid oxide fuel cell (SOFC)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Performance of lanthanum strontium manganite electrodes at high pressure. / Thomsen, E. C.; Coffey, G. W.; Pederson, L. R.; Marina, O. A.

In: Journal of Power Sources, Vol. 191, No. 2, 15.06.2009, p. 217-224.

Research output: Contribution to journalArticle

Thomsen, E. C. ; Coffey, G. W. ; Pederson, L. R. ; Marina, O. A. / Performance of lanthanum strontium manganite electrodes at high pressure. In: Journal of Power Sources. 2009 ; Vol. 191, No. 2. pp. 217-224.
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