In situ analysis on the electrical conductivity degradation of NiO doped yttria stabilized zirconia electrolyte by micro-Raman spectroscopy

Haruo Kishimoto, Keiji Yashiro, Taro Shimonosono, Manuel E. Brito, Katsuhiko Yamaji, Teruhisa Horita, Harumi Yokokawa, Junichiro Mizusaki

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Phase transformation of 1 mol% NiO doped yttria stabilized zirconia (YSZ) under SOFC operation atmospheres was analyzed by in situ Raman spectroscopy with simultaneous measurement of conductivity using a test cell consisting of air, Pt/NiO doped YSZ/Pt, wet Ar balanced 50 vol% H 2. In situ measurement was carried out under open circuit voltage (OCV) condition at 1173 K for more than 20 h. Phase transformation from the cubic to the tetragonal phase progressively proceeded from the matting surface of the electrolyte on the anode side with increasing holding time. Simultaneously, the electrical conductivity of the electrolyte also exhibited monotonically decrease from about 0.103 S cm -1 to 0.084 S cm -1. The phase transformation started from the anode/electrolyte interface. The tetragonal to cubic phase volume ratio evaluated from the Raman spectra, rapidly decreased with increasing depth from the anode/electrolyte interface towards the center of the electrolyte. We have experimentally demonstrated by the in situ measurement that the conductivity degradation of NiO doped YSZ is closely associated to the phase transformation under a reducing condition at a high temperature.

Original languageEnglish
Pages (from-to)263-267
Number of pages5
JournalElectrochimica Acta
Volume82
DOIs
Publication statusPublished - 2012 Nov 1

Keywords

  • Electrical conductivity
  • In situ Raman spectroscopy
  • Nickel
  • Phase transformation
  • Solid oxide fuel cell (SOFC)
  • Yttria stabilized zirconia (YSZ)

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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