Active sites imaging for oxygen reduction at the La0.9Sr0.1MnO3-x/yttria-stabilized zirconia interface by secondary-ion mass spectrometry

Teruhisa Horita, Katsuhiko Yamaji, Masahiko Ishikawa, Natsuko Sakai, Harumi Yokokawa, Tatsuya Kawada, Tohru Kato

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156 Citations (Scopus)

Abstract

Active sites for oxygen reduction were investigated at the interface of O2/La0.9Sr0.1MnO3-x(LSM)/yttria-stabilized zirconia (YSZ). Isotopic oxygen (16O/18O) exchange under cathodic polarization and secondary-ion mass spectrometry (SIMS) analysis were examined to visualize the oxygen reduction active sites. The LSM mesh pattern electrode was prepared to define the contact area of LSM/YSZ. Under cathodic polarization, oxygen can diffuse through the dense LSM via oxygen vacancy, which promotes the electrode reaction. By SIMS imaging technique, the active sites for oxygen reduction were clearly determined as spots around the O2/LSM/YSZ three-phase boundary. The line analysis of the SIMS image enabled us to draw a contour map of the 18O concentration in the cross section of YSZ. The diffusion paths were clearly visualized in the contour map. The width of the active sites for oxygen reduction is estimated to be less than 1 μm under the examined condition.

Original languageEnglish
Pages (from-to)3196-3202
Number of pages7
JournalJournal of the Electrochemical Society
Volume145
Issue number9
DOIs
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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