Hydrogen permeability and electrical properties in oxide composites

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

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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 - Dec 15 2008

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All Science Journal Classification (ASJC) codes

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

Cite this

Unemoto, A., Kaimai, A., Sato, K., Yashiro, K., Matsumoto, H., Mizusaki, J., ... Kawada, T. (2008). Hydrogen permeability and electrical properties in oxide composites. Solid State Ionics, 178(31-32), 1663-1667. https://doi.org/10.1016/j.ssi.2007.11.001