Oxygen transport and surface exchange properties of Sr0.5Sm 0.5CoO3-δ

Ted C. Yeh, Jules L. Routbort, Thomas O. Mason

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12 Citations (Scopus)

Abstract

Oxygen tracer diffusion (Dâ) and chemical diffusion (DËœ) were measured in dense Sr0.5Sm0.5CoO 3 - δ (SSC) ceramics by Isotope Exchange Depth Profiling/Secondary Ion Mass Spectrometry (IEDP/SIMS) and electrical conductivity relaxation (ECR) over the temperature ranges of ∼100-200 C and 400-600 C, respectively. In addition, the surface exchange coefficients were determined over the same temperature ranges. The transport properties and exchange kinetics of SSC are comparable to or better than those of other solid oxide fuel cell cathode candidates in the literature. The ionic conductivity of SSC was calculated using the Nernst-Einstein equation, and is comparable to that of leading solid oxide electrolytes at intermediate temperatures.

Original languageEnglish
Pages (from-to)138-143
Number of pages6
JournalSolid State Ionics
Volume232
DOIs
Publication statusPublished - Jan 15 2013

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Keywords

  • Cathode
  • Chemical diffusivity
  • Solid oxide fuel cell
  • SrSmCoO
  • Surface exchange coefficient
  • Tracer diffusivity

ASJC Scopus subject areas

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

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