TY - JOUR
T1 - Hydrogen permeability and electrical properties in oxide composites
AU - Unemoto, Atsushi
AU - Kaimai, Atsushi
AU - Sato, Kazuhisa
AU - Yashiro, Keiji
AU - Matsumoto, Hiroshige
AU - Mizusaki, Junichiro
AU - Amezawa, Koji
AU - Kawada, Tatsuya
PY - 2008/12/15
Y1 - 2008/12/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.ssi.2007.11.001
DO - 10.1016/j.ssi.2007.11.001
M3 - Article
AN - SCOPUS:36849022119
VL - 178
SP - 1663
EP - 1667
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 31-32
ER -