Study of oxygen transport of microtubular La0.5Sr0.5Fe1 – xNbxO3 – δ membranes

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Abstract

Perovskite-like oxides based on lanthanum-strontium ferrites are considered promising electrode materials for use in various types of fuel cells, and the strategy of modifying these materials by partial substitution of iron with highly charged ferroactive cations has proven to be an effective way to increase their chemical stability. In this paper, for the first time, the results of a study of the permeability of microtubular oxygen membranes based on La0.5Sr0.5Fe1 – xNbxO3 – δ oxide are presented. The activation energy of oxide bulk diffusion (20±4 kJ/mol) was found.

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About the authors

I. V. Kovalev

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Author for correspondence.
Email: kovalev.ivan.vyacheslavovich@gmail.com
Russian Federation, Novosibirsk

R. D. Guskov

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Email: kovalev.ivan.vyacheslavovich@gmail.com
Russian Federation, Novosibirsk

V. P. Sivtsev

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Email: kovalev.ivan.vyacheslavovich@gmail.com
Russian Federation, Novosibirsk

M. I. Gongola

Institute of Solid State Chemistry and Mechanochemistry SB RAS; Novosibirsk State University

Email: kovalev.ivan.vyacheslavovich@gmail.com
Russian Federation, Novosibirsk; Novosibirsk

M. P. Popov

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Email: kovalev.ivan.vyacheslavovich@gmail.com
Russian Federation, Novosibirsk

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Comparison of experimental and calculated diffraction patterns.

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3. Fig. Fig. 2. SEM membranes LSFN10 in cross section (a) and on the surface (b).

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4. Fig. 3. Results of energy dispersive analysis of the surface of the LSFN10 sample: (a) main phase, (b) secondary phase.

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5. Fig. Fig. 4. Dependence of the specific oxygen flow (JO2) on the supply gas pressure (p1) for membranes of composition LSFN10.

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6. Fig. Fig. 5. Arrhenius dependence of oxygen exchange for membranes of composition LSFN10.

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