Effects of surface modification on the oxygen permeation of Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane

Yoshiaki Hayamizu; Manami Kato; Hitoshi Takamura

doi:10.1016/j.memsci.2014.03.038

Effects of surface modification on the oxygen permeation of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ membrane

Yoshiaki Hayamizu, Manami Kato, Hitoshi Takamura

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	147-152
Number of pages	6
Journal	Journal of Membrane Science
Volume	462
DOIs	https://doi.org/10.1016/j.memsci.2014.03.038
Publication status	Published - 2014 Jul 15

Keywords

MIEC
Oxygen permeable membrane
Surface kinetics
Surface modification

ASJC Scopus subject areas

Biochemistry
Materials Science(all)
Physical and Theoretical Chemistry
Filtration and Separation

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title = "Effects of surface modification on the oxygen permeation of Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane",

abstract = "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.",

keywords = "MIEC, Oxygen permeable membrane, Surface kinetics, Surface modification",

author = "Yoshiaki Hayamizu and Manami Kato and Hitoshi Takamura",

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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

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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