The atomic hydrogen permeability in (CeO2)0.85(CaO)0.15 at high temperatures

Y. Nigara, K. Yashiro, T. Kawada, J. Mizusaki

Research output: Contribution to journalConference articlepeer-review

16 Citations (Scopus)

Abstract

The atomic hydrogen permeability, JH, in fluorite-type (CeO2)0.85(CaO)0.15 was measured to confirm the influence of CaO concentration in CeO2 at 1050-1800 K. The decrease of JH with reducing temperature and the proportionality of log JH to inverse temperature are suggested. The estimated activation energies are 1.05±0.01, 1.35±0.02 and 0.22±0.04 eV at 1800-1400, 1400-1250 and 1250-1050 K, respectively. The JH of (CeO2)1-X(CaO)X decreases with increasing X and proportional to X5/2 at 1800-1300 K under H2-H2O atmosphere. H2 is decomposed to 2H+ and 2e- on the surface of the specimen and they permeate it. They hop between oxygen ions and cerium ions, respectively. It would be difficult for H+ to cross over Vö, which was produced by CaO, then JH decreased with increasing X. (CeO2)1-X(CaO)X would be the electron-proton mixed conductor under H2-H2O atmosphere at high temperatures.

Original languageEnglish
Pages (from-to)365-370
Number of pages6
JournalSolid State Ionics
Volume145
Issue number1-4
DOIs
Publication statusPublished - 2001 Dec 1
Event10th International Conference on Solid State (SSPC10) - Montpellier, France
Duration: 2000 Sep 242000 Sep 28

Keywords

  • Activation energy of CeCaO
  • Electron-proton mixed conductor
  • Fluorite-type oxide
  • Hydrogen permeability
  • Oxygen vacancy concentration
  • Proton conduction

ASJC Scopus subject areas

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

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