@inproceedings{e074a6dbf64448a9874a7c8d0abd078a,
title = "Firing temperature effect on 3D microstructure and performance of LSM-YSZ composite SOFC cathodes",
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.",
author = "Cronin, {J. S.} and K. Muangnapoh and Z. Patterson and K. Yakal-Kremski and Barnett, {S. A.}",
year = "2011",
month = dec,
day = "1",
doi = "10.1149/1.3570233",
language = "English (US)",
isbn = "9781607682363",
series = "ECS Transactions",
number = "3 PART 3",
pages = "2369--2378",
booktitle = "Solid Oxide Fuel Cells 12, SOFC XII",
edition = "3 PART 3",
note = "12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting ; Conference date: 01-05-2011 Through 06-05-2011",
}