Firing temperature effect on 3D microstructure and performance of LSM-YSZ composite SOFC cathodes

J. S. Cronin*, K. Muangnapoh, Z. Patterson, K. Yakal-Kremski, S. A. Barnett

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

(La 0.8Sr 0.2)MnO 3-Y-stabilized zirconia (LSM-YSZ) cathodes fired at various temperatures were studied using 3D Focused Ion Beam - Scanning Electron Microscopy (FIB-SEM) tomography and Impedance Spectroscopy (IS). The lowest resistance cathode, fired at 1175°C, had nearly the highest active three-phase boundary density. This optimum was where the firing temperature was sufficient to yield good LSM-particle percolation but not so high as to cause substantial particle coarsening and densification. Increasing the firing temperature above 1175°C caused a shift in the main impedance response from ∼100-1000 Hz to 1-10 Hz; this low-frequency response was primarily an electrochemical process, with gas diffusion becoming significant only for low oxygen pressure. Focusing on the low frequency peak for cathodes fired at 1325°C, A-site-deficient LSM yielded lower resistance than stoichiometric LSM. Finally, cathodes were annealed at 1000-1100°C in order to accelerate structural evolution; changes in the impedance response were similar to those observed with increasing firing temperature.

Original languageEnglish (US)
Title of host publicationSolid Oxide Fuel Cells 12, SOFC XII
Pages2369-2378
Number of pages10
Edition3 PART 3
DOIs
StatePublished - Dec 1 2011
Event12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting - Montreal, QC, Canada
Duration: May 1 2011May 6 2011

Publication series

NameECS Transactions
Number3 PART 3
Volume35
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting
CountryCanada
CityMontreal, QC
Period5/1/115/6/11

ASJC Scopus subject areas

  • Engineering(all)

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