The orientation distributions of lines, surfaces, and interfaces around three-phase boundaries in solid oxide fuel cell cathodes

Shen J. Dillon, Lam Helmick, Herbert M. Miller, Lane Wilson, Randall Gemman, Rumyana V. Petrova, Katayun Barmak, Gregory S. Rohrer, Paul A. Salvador

Research output: Contribution to journalArticle

Abstract

Three-dimensional electron backscatter diffraction was used to measure the crystallographic distribution of the electrochemically relevant triple phase boundary lines and surfaces near them in SOFC cathodes made up of a porous mixture of yttria-stabilized zirconia and lanthanum strontium manganese oxide, both before and after mild electrochemical loading. All distributions were observed to be nearly isotropic, but non-random textures above the detection threshold were observed. The distributions differ between the two cells, as do the phase fractions and the electrochemical history. The different distributions are interpreted as evidence that steady-state distributions vary locally with phase fractions or that they evolve during the initial operation of the fuel cell. The rates at which triple lines, pore surfaces, and interface boundaries in the porous mixture approach a steady-state value appear to decrease with the average amount of mass transport required to reorient that specific feature. This work provides initial insights into the crystallography of interfaces in a multiphase ceramic material.

Original languageEnglish (US)
Pages (from-to)4045-4051
Number of pages7
JournalJournal of the American Ceramic Society
Volume94
Issue number11
DOIs
StatePublished - Nov 1 2011

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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