TY - JOUR
T1 - Effects of surface modification on the oxygen permeation of Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane
AU - Hayamizu, Yoshiaki
AU - Kato, Manami
AU - Takamura, Hitoshi
N1 - Funding Information:
HT would like to thank the Funding Program for Next Generation World-Leading Researchers (NEXT Program: GR011 ) by Japan Society for the Promotion of Science.
PY - 2014/7/15
Y1 - 2014/7/15
N2 - The surface of Ba0.5Sr0.5Co0.8Fe0.2O3 -δ (BSCF) membrane was modified by the addition of a porous layer in order to improve the oxygen permeation properties of this material. At 700°C, the oxygen permeation rate of a 120 μm-thick BSCF sample with a 6.5 μm-thick porous layer was 3.6 times that of a similar sample with no surface layer. An estimation of the surface area of the applied porous layer indicated that only the 1.1 μm of the porous layer nearest the membrane had an effect on the oxygen permeation rate. Weight relaxation was performed at 400°C to clarify the enhancement of the surface exchange reaction. The chemical surface exchange coefficient (kchem) was 3.1 times larger for the sample with the porous layer coating. The thickness of the porous layer affecting the oxygen permeation rate was estimated by the transmission line model by Dchem and kchem.
AB - The surface of Ba0.5Sr0.5Co0.8Fe0.2O3 -δ (BSCF) membrane was modified by the addition of a porous layer in order to improve the oxygen permeation properties of this material. At 700°C, the oxygen permeation rate of a 120 μm-thick BSCF sample with a 6.5 μm-thick porous layer was 3.6 times that of a similar sample with no surface layer. An estimation of the surface area of the applied porous layer indicated that only the 1.1 μm of the porous layer nearest the membrane had an effect on the oxygen permeation rate. Weight relaxation was performed at 400°C to clarify the enhancement of the surface exchange reaction. The chemical surface exchange coefficient (kchem) was 3.1 times larger for the sample with the porous layer coating. The thickness of the porous layer affecting the oxygen permeation rate was estimated by the transmission line model by Dchem and kchem.
KW - MIEC
KW - Oxygen permeable membrane
KW - Surface kinetics
KW - Surface modification
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U2 - 10.1016/j.memsci.2014.03.038
DO - 10.1016/j.memsci.2014.03.038
M3 - Article
AN - SCOPUS:84897949020
VL - 462
SP - 147
EP - 152
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
ER -