Electrical conductivity and oxygen permeation properties of SrCoFeOx membranes

Jay Kniep; Qinghua Yin; Izumi Kumakiri; Jerry Lin

doi:10.1016/j.ssi.2009.11.004

Electrical conductivity and oxygen permeation properties of SrCoFeO_x membranes

Jay Kniep, Qinghua Yin, Izumi Kumakiri, Jerry Lin

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

18 Scopus citations

Abstract

The total conductivity and oxygen permeation properties of dense SrCoFeO_x membranes synthesized from the solid state method were studied in the temperature range of 700-900 °C. The SrCoFeO_x membranes consist of an intergrowth (Sr₄Fe_{6 - x}Co_xO_{13 ± δ}), perovskite (SrFe_{1 - x}Co_xO_{3 - δ}), and spinel (Co_{3 - x}Fe_xO₄) phase. SrCoFeO_x exhibits n-type and p-type conduction at low and high oxygen partial pressures, respectively, and has a total conductivity of 16.5 S/cm at 900 °C in air. The oxygen permeation fluxes for SrCoFeO_x and SrFeCo_0.5O_x membranes were measured with either an inert or carbon monoxide sweep gas. The oxygen permeation fluxes were higher through SrCoFeO_x membranes than SrFeCo_0.5O_x membranes and can be attributed to a difference in the amount and makeup of the perovskite phase present in each composition. The oxygen permeation fluxes with a carbon monoxide sweep gas were approximately two orders of magnitude larger than the fluxes measured with an inert sweep gas for both compositions. The large oxygen permeation fluxes observed with a carbon monoxide sweep are due to a higher driving force for oxygen transport and a reaction on the sweep side of the membrane that maintains a low oxygen partial pressure.

Original language	English (US)
Pages (from-to)	1633-1639
Number of pages	7
Journal	Solid State Ionics
Volume	180
Issue number	40
DOIs	https://doi.org/10.1016/j.ssi.2009.11.004
State	Published - Jan 29 2010

Keywords

Mixed-conducting oxide membrane
Oxygen permeation
Strontium iron cobalt oxide

ASJC Scopus subject areas

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

Access to Document

10.1016/j.ssi.2009.11.004

Cite this

@article{662e6f0750e84ea49dc87f327fe7ae6d,

title = "Electrical conductivity and oxygen permeation properties of SrCoFeOx membranes",

abstract = "The total conductivity and oxygen permeation properties of dense SrCoFeOx membranes synthesized from the solid state method were studied in the temperature range of 700-900 °C. The SrCoFeOx membranes consist of an intergrowth (Sr4Fe6 - xCoxO13 ± δ), perovskite (SrFe1 - xCoxO3 - δ), and spinel (Co3 - xFexO4) phase. SrCoFeOx exhibits n-type and p-type conduction at low and high oxygen partial pressures, respectively, and has a total conductivity of 16.5 S/cm at 900 °C in air. The oxygen permeation fluxes for SrCoFeOx and SrFeCo0.5Ox membranes were measured with either an inert or carbon monoxide sweep gas. The oxygen permeation fluxes were higher through SrCoFeOx membranes than SrFeCo0.5Ox membranes and can be attributed to a difference in the amount and makeup of the perovskite phase present in each composition. The oxygen permeation fluxes with a carbon monoxide sweep gas were approximately two orders of magnitude larger than the fluxes measured with an inert sweep gas for both compositions. The large oxygen permeation fluxes observed with a carbon monoxide sweep are due to a higher driving force for oxygen transport and a reaction on the sweep side of the membrane that maintains a low oxygen partial pressure.",

keywords = "Mixed-conducting oxide membrane, Oxygen permeation, Strontium iron cobalt oxide",

author = "Jay Kniep and Qinghua Yin and Izumi Kumakiri and Jerry Lin",

note = "Funding Information: The authors acknowledge the support of the National Science Foundation ( CTS-0513366 ) on this project. The authors would also like to acknowledge the support of a NSF International Research and Education in Engineering (IREE) Travel Award supporting CTS-0513366 that allowed research for a portion of this paper to be conducted at The Foundation for Industrial and Technological Research at the Norwegian Institute of Technology (SINTEF) in Oslo, Norway.",

year = "2010",

month = jan,

day = "29",

doi = "10.1016/j.ssi.2009.11.004",

language = "English (US)",

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pages = "1633--1639",

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T1 - Electrical conductivity and oxygen permeation properties of SrCoFeOx membranes

AU - Kniep, Jay

AU - Yin, Qinghua

AU - Kumakiri, Izumi

AU - Lin, Jerry

N1 - Funding Information: The authors acknowledge the support of the National Science Foundation ( CTS-0513366 ) on this project. The authors would also like to acknowledge the support of a NSF International Research and Education in Engineering (IREE) Travel Award supporting CTS-0513366 that allowed research for a portion of this paper to be conducted at The Foundation for Industrial and Technological Research at the Norwegian Institute of Technology (SINTEF) in Oslo, Norway.

PY - 2010/1/29

Y1 - 2010/1/29

N2 - The total conductivity and oxygen permeation properties of dense SrCoFeOx membranes synthesized from the solid state method were studied in the temperature range of 700-900 °C. The SrCoFeOx membranes consist of an intergrowth (Sr4Fe6 - xCoxO13 ± δ), perovskite (SrFe1 - xCoxO3 - δ), and spinel (Co3 - xFexO4) phase. SrCoFeOx exhibits n-type and p-type conduction at low and high oxygen partial pressures, respectively, and has a total conductivity of 16.5 S/cm at 900 °C in air. The oxygen permeation fluxes for SrCoFeOx and SrFeCo0.5Ox membranes were measured with either an inert or carbon monoxide sweep gas. The oxygen permeation fluxes were higher through SrCoFeOx membranes than SrFeCo0.5Ox membranes and can be attributed to a difference in the amount and makeup of the perovskite phase present in each composition. The oxygen permeation fluxes with a carbon monoxide sweep gas were approximately two orders of magnitude larger than the fluxes measured with an inert sweep gas for both compositions. The large oxygen permeation fluxes observed with a carbon monoxide sweep are due to a higher driving force for oxygen transport and a reaction on the sweep side of the membrane that maintains a low oxygen partial pressure.

AB - The total conductivity and oxygen permeation properties of dense SrCoFeOx membranes synthesized from the solid state method were studied in the temperature range of 700-900 °C. The SrCoFeOx membranes consist of an intergrowth (Sr4Fe6 - xCoxO13 ± δ), perovskite (SrFe1 - xCoxO3 - δ), and spinel (Co3 - xFexO4) phase. SrCoFeOx exhibits n-type and p-type conduction at low and high oxygen partial pressures, respectively, and has a total conductivity of 16.5 S/cm at 900 °C in air. The oxygen permeation fluxes for SrCoFeOx and SrFeCo0.5Ox membranes were measured with either an inert or carbon monoxide sweep gas. The oxygen permeation fluxes were higher through SrCoFeOx membranes than SrFeCo0.5Ox membranes and can be attributed to a difference in the amount and makeup of the perovskite phase present in each composition. The oxygen permeation fluxes with a carbon monoxide sweep gas were approximately two orders of magnitude larger than the fluxes measured with an inert sweep gas for both compositions. The large oxygen permeation fluxes observed with a carbon monoxide sweep are due to a higher driving force for oxygen transport and a reaction on the sweep side of the membrane that maintains a low oxygen partial pressure.

KW - Mixed-conducting oxide membrane

KW - Oxygen permeation

KW - Strontium iron cobalt oxide

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