TY - JOUR
T1 - Double-site yttria-doped Sr1-xYxCo1-yYyO3-δ perovskite oxides as oxygen semi-permeable membranes
AU - Zhang, Kun
AU - Ran, Ran
AU - Ge, Lei
AU - Shao, Zongping
AU - Jin, Wanqin
AU - Xu, Nanping
PY - 2009/4/17
Y1 - 2009/4/17
N2 - New mixed conducting oxides with the composition of Sr1-xYxCo1-yYyO3-δ (x = 0.0-0.8, y = 0.0-0.1) were exploited and synthesized. The resulted materials were investigated by X-ray diffraction, four-probe dc conductivity, temperature-programmed desorption characterization, and oxygen permeability measurement. As compared with the oxides with only one-site (A or B) being Y3+-doped, i.e., Sr1-xYxCoO3-δ and SrCo1-yYyO3-δ, the double-site Y3+-doped ones show improved phase stability, higher electrical conductivity under reduced atmosphere, and higher oxygen permeability and stability. Particularly, Sr0.95Y0.05Co0.95Y0.05O3-δ oxide demonstrates stable cubic perovskite phase in air, oxygen and nitrogen, high electrical conductivity of ∼110 S cm-1 in air and ∼50 S cm-1 in nitrogen, and a maximum permeation flux of 1.35 × 10-6 mol cm-2 s-1 at 900 °C under an air/helium gradient. Long-term permeation study at 850 °C indicates that Sr0.95Y0.05Co0.95Y0.05O3-δ can operate stably as oxygen semi-permeable membrane.
AB - New mixed conducting oxides with the composition of Sr1-xYxCo1-yYyO3-δ (x = 0.0-0.8, y = 0.0-0.1) were exploited and synthesized. The resulted materials were investigated by X-ray diffraction, four-probe dc conductivity, temperature-programmed desorption characterization, and oxygen permeability measurement. As compared with the oxides with only one-site (A or B) being Y3+-doped, i.e., Sr1-xYxCoO3-δ and SrCo1-yYyO3-δ, the double-site Y3+-doped ones show improved phase stability, higher electrical conductivity under reduced atmosphere, and higher oxygen permeability and stability. Particularly, Sr0.95Y0.05Co0.95Y0.05O3-δ oxide demonstrates stable cubic perovskite phase in air, oxygen and nitrogen, high electrical conductivity of ∼110 S cm-1 in air and ∼50 S cm-1 in nitrogen, and a maximum permeation flux of 1.35 × 10-6 mol cm-2 s-1 at 900 °C under an air/helium gradient. Long-term permeation study at 850 °C indicates that Sr0.95Y0.05Co0.95Y0.05O3-δ can operate stably as oxygen semi-permeable membrane.
KW - Membrane
KW - Mixed conductivity
KW - Oxygen permeation
KW - Perovskite
UR - http://www.scopus.com/inward/record.url?scp=61649084726&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2008.06.120
DO - 10.1016/j.jallcom.2008.06.120
M3 - 文章
AN - SCOPUS:61649084726
SN - 0925-8388
VL - 474
SP - 477
EP - 483
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -