High temperature pH sensitivities of stabilized zirconia films and ceria ceramics

Yasushi Inda, Kimihiro Yamashita, Takao Umegaki, Martha Greenblatt

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Yttria-stabilized zirconia (YSZ) thick films and bulk ceria (CeO2) ceramics used as membrane electrodes are shown to work as high temperature pH sensors. The YSZ film electrode shows a nearly ideal Nernstian response of the potential as a function of pH with mV/pH = - 56.8 even at 353 K. The YSZ film electrode responded to pH changes within 30 s, while the response time of the samaria-doped ceria ceramic membrane electrode was 3 min. Complex impedance analysis revealed that the bulk conductivity of the ceria ceramics is higher than that of YSZ film, whereas the grain-boundary conductivity of the former was 102 times lower than that of the latter. Based on these results, it appears that at temperatures below 600 K, the pH sensory characteristics of these materials are dominated by the grain-boundary conductivity.

Original languageEnglish (US)
Pages (from-to)1121-1124
Number of pages4
JournalSolid State Ionics
Volume86-88
Issue numberPART 2
DOIs
StatePublished - Jul 1996

All Science Journal Classification (ASJC) codes

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

Keywords

  • Ceria ceramics
  • High temperature pH sensor
  • Impedance conductivity grain boundary
  • YSZ film

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