Effectiveness of dense Gd-doped ceria barrier layers for (La,Sr)(Co,Fe)O 3 cathodes on Yttria-stabilized zirconia electrolytes

Justin Railsback, Sun Hee Choi, Scott A. Barnett*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

This paper presents a detailed study of the effectiveness of Gd-doped Ceria (GDC) barrier layers for preventing reactions between La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) cathodes and Yttria-stabilized Zirconia (YSZ) electrolytes. The GDC barrier layers, which are reasonably dense as produced by a novel process where the GDC and YSZ are co-fired at 1250 °C, were varied in thickness from 1.5 to 6 μm. No measureable Sr transport occurs across the GDC layer of any thickness for a relatively low LSCF firing temperature of 1000 °C, or for thickness ≥ 4.5 μm at any firing temperature. Sr was detected at the GDC/YSZ interface for thinner barriers and higher firing temperatures, in the form of a discontinuous SrZrO 3 phase. This zirconate phase forms preferentially at pores and grain boundaries in the GDC layer, probably indicating that these were pathways for relatively fast Sr transport. Atom probe tomography results indicated segregation of impurities to grain boundaries near the GDC/YSZ interface.

Original languageEnglish (US)
Pages (from-to)74-81
Number of pages8
JournalSolid State Ionics
Volume335
DOIs
StatePublished - Jul 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Effectiveness of dense Gd-doped ceria barrier layers for (La,Sr)(Co,Fe)O <sub>3</sub> cathodes on Yttria-stabilized zirconia electrolytes'. Together they form a unique fingerprint.

Cite this