Visualization of oxygen transport behavior at metal electrode/oxide electrolyte interface using secondary ion mass spectrometry

Haruo Kishimoto, Natsuko Sakai, Katsuhiko Yamaji, Teruhisa Horita, Manuel E. Brito, Harumi Yokokawa, Koji Amezawa, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The tracks of oxygen transport around platinum or gold electrode/yttria stabilized zirconia (YSZ) electrolyte interface were visualized by oxygen isotope (18O) labeling (T = 773-973 K, p(O2) = 7 kPa, cathodic polarization E = 0 or - 0.3 V) and multi dimensional imaging using secondary ion mass spectrometry (SIMS). The activation of oxygen exchange reaction was clearly observed as a strong 18O- intensity at metal/YSZ interface treated at T = 973 K indicating that the reaction dominantly occurs at gas/electrode/electrolyte triple phase boundary (TPB). Platinum/YSZ interface exhibited a stronger 18O- intensity than gold/YSZ, however, the intensity distribution was not homogenous. The effect of applying cathodic polarization on the oxygen transport was more clearly observed at gold/YSZ interface than platinum/YSZ. The cause of differences in experimental results is discussed in connection with the different reaction controlling process among the two electrodes materials.

Original languageEnglish
Pages (from-to)347-354
Number of pages8
JournalSolid State Ionics
Volume179
Issue number9-10
DOIs
Publication statusPublished - 2008 May 15

Keywords

  • Cathode
  • Diffusion
  • Isotope
  • Overpotential
  • Oxygen reduction
  • Oxygen transport
  • SIMS
  • SOFC
  • Surface exchange

ASJC Scopus subject areas

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

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