Analysis of LSM-YSZ composite cathode phase connectivity using three-dimensional reconstructions

James R. Wilson, J. Scott Cronin, Sherri Rukes, Anh Duong, Daniel Mumm, Scott Barnett

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

13 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI)
Pages2283-2292
Number of pages10
Edition2 PART 3
DOIs
StatePublished - 2009
Event11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting - Vienna, Austria
Duration: Oct 4 2009Oct 9 2009

Publication series

NameECS Transactions
Number2 PART 3
Volume25
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting
Country/TerritoryAustria
CityVienna
Period10/4/0910/9/09

ASJC Scopus subject areas

  • Engineering(all)

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