TY - GEN
T1 - Analysis of LSM-YSZ composite cathode phase connectivity using three-dimensional reconstructions
AU - Wilson, James R.
AU - Cronin, J. Scott
AU - Rukes, Sherri
AU - Duong, Anh
AU - Mumm, Daniel
AU - Barnett, Scott
PY - 2009
Y1 - 2009
N2 - Composite electrodes commonly consist of interconnected pore, electronic-conductor, and ionic-conductor phases that are responsible for the transport of gas phase species, electrons, and oxygen ions, respectively. Attempts to understand how this complicated structure influences electrochemical performance can be facilitated through the acquisition of quantitative microstructural data. In this work, nine different cathode compositions ranging from 30 wt% La0.8Sr0.2MnO3 (LSM) - 70 wt% Y2O3-stabilized ZrO2 (YSZ) to 70 wt% LSM - 30 wt% YSZ were screen printed symmetrically on both sides of YSZ-electrolytes. 3D reconstructions of the cathodes were achieved using focused ion beam (FIB) tomography techniques, and the connectivity of the phases was quantified to determine the electrochemically active triple-phase boundary (EA-TPB) densities. The composition dependence of the polarization resistance, calculated with an electrochemical model that employed the EATPB densities along with measured YSZ tortuosities, was compared with the measured resistances.
AB - Composite electrodes commonly consist of interconnected pore, electronic-conductor, and ionic-conductor phases that are responsible for the transport of gas phase species, electrons, and oxygen ions, respectively. Attempts to understand how this complicated structure influences electrochemical performance can be facilitated through the acquisition of quantitative microstructural data. In this work, nine different cathode compositions ranging from 30 wt% La0.8Sr0.2MnO3 (LSM) - 70 wt% Y2O3-stabilized ZrO2 (YSZ) to 70 wt% LSM - 30 wt% YSZ were screen printed symmetrically on both sides of YSZ-electrolytes. 3D reconstructions of the cathodes were achieved using focused ion beam (FIB) tomography techniques, and the connectivity of the phases was quantified to determine the electrochemically active triple-phase boundary (EA-TPB) densities. The composition dependence of the polarization resistance, calculated with an electrochemical model that employed the EATPB densities along with measured YSZ tortuosities, was compared with the measured resistances.
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U2 - 10.1149/1.3205779
DO - 10.1149/1.3205779
M3 - Conference contribution
AN - SCOPUS:77649146210
SN - 9781566777391
T3 - ECS Transactions
SP - 2283
EP - 2292
BT - ECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI)
T2 - 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting
Y2 - 4 October 2009 through 9 October 2009
ER -