Mixed conductivity and electrocatalytic performance of SrFeO3-delta-SrAl2O4 composite membranes

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abstract

Oxygen-ionic and electronic transport in dense (SrFe)(1-x)(SrAl2)(x)O-z composites, consisting of strontium-deficient Sr(Fe,Al)O3-delta and SrAl2O4 phases, is determined by the properties of perovskite-like solid solution. Increasing the content of SrAl2O4, with a total conductivity as low as 5 x 10(-7) - 10(-5) S x cm(-1) at 973-1273 K in air, results in the gradual decrease of the partial conductivities, but also enables the suppression of thermal expansion. Compared to single-phase SrFe1-xAlxO3-delta, (SrFe)(1-x)(SrAl2)(x)O-z composites exhibit enhanced thermomechanical properties, while the oxygen permeability of these materials has similar values. The composite membranes exhibit stable performance under air/(H-2-H2O-N-2) and air/(CH4-He) gradients at 973-1173 K. The oxidation of dry methane by oxygen permeating through (SrFe)(0.7)(SrAl2)(0.3)O-z results in dominant total oxidation, suggesting the necessity to incorporate a reforming catalyst into the ceramic reactors for natural gas conversion. (c) 2006 Elsevier B.V. All rights reserved.

keywords

OXYGEN PERMEABILITY

subject category

Chemistry; Physics

authors

Yaremchenko, AA; Kharton, VV; Valente, AA; Shaula, AL; Marques, FMB; Rocha, J

our authors

foto Aleksey Yaremchenko

Aleksey Yaremchenko

Principal Researcher
foto Anabela Tavares Aguiar Valente

Anabela Tavares Aguiar Valente

Principal Researcher
foto Fernando Manuel Bico Marques

Fernando Manuel Bico Marques

Full professor
foto João Rocha

João Rocha

Full Professor
foto Vladislav Kharton

Vladislav Kharton

Invited Principal Researcher

Groups

G1 - Porous Materials and Nanosystems
G3 - Electrochemical Materials, Interfaces and Coatings
G4 - Renewable Materials and Circular Economy

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Publication Details

type
Journal Article
year
2006
journal
SOLID STATE IONICS
volume
177
publisher
ELSEVIER SCIENCE BV
issn
0167-2738
issue
26-32
digital object identifier
10.1016/j.ssi.2006.03.039
web of science article identifier
WOS:000242611800016

Journal Metrics (JCR 2019)

Journal Impact Factor
3.107
Journal Impact Factor (5 yrs)
2.904
category normalized journal percentile
58.409

Citations

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