Hydrogen permeability and electrical properties in oxide composites

Atsushi Unemoto, Atsushi Kaimai, Kazuhisa Sato, Keiji Yashiro, Hiroshige Matsumoto, Junichiro Mizusaki, Koji Amezawa, Tatsuya Kawada

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

A novel concept for hydrogen permeable membrane proposed here is the use of oxide composites consisting of proton and electron conducting oxides. Composites with the overall composition of (1 - y)(SrZrO3) - y(SrFeO3) were chosen as a model membrane to investigate the electrical and the hydrogen permeation properties. In this system, it was expected that Fe-doped SrZrO3 phase and SrFeO3-based phase individually form the pathways of protons and electrons, respectively. As we expected, considerable hydrogen permeation was observed across the oxide composites for y = 0.05, 0.1 and 0.2 using platinum as a surface catalyst. The hydrogen permeation fluxes were well described by assuming the ambipolar-diffusion-like kinetics for y = 0.1 and 0.2 at 1173 K. However, the observed hydrogen fluxes became smaller than the estimated ones as temperature and/or the content of SrFeO3-based phase decreased, suggesting the remarkable contribution of surface reaction to the kinetics of hydrogen permeation.

Original languageEnglish
Pages (from-to)1663-1667
Number of pages5
JournalSolid State Ionics
Volume178
Issue number31-32
DOIs
Publication statusPublished - 2008 Dec 15

Keywords

  • Electrical conductivity
  • Hydrogen permeability
  • Oxide composites
  • SrFeO
  • SrZrO

ASJC Scopus subject areas

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

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