Compositional effect of Cr contamination susceptibility of La9.83Si6−x−yAlxFeyO26±δ apatite-type SOFC electrolytes in contact with CROFER 22 APU

P. K. Pandis; E. Xenogiannopoulou; P. M. Sakkas; G. Sourkouni; Ch. Argirusis; V. N. Stathopoulos

doi:10.1039/C6RA02025A

Compositional effect of Cr contamination susceptibility of La_9.83Si_6−x−yAl_xFe_yO_26±δ apatite-type SOFC electrolytes in contact with CROFER 22 APU†

P. K. Pandis,^ab E. Xenogiannopoulou,^c P. M. Sakkas,^b G. Sourkouni,^de Ch. Argirusis^be and V. N. Stathopoulos

*^a

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* Corresponding authors

^a Laboratory of Chemistry and Materials Technology, Department of Electrical Engineering, School of Technological Applications, Technological Educational Institute of Sterea Ellada, Psachna, Evia, Greece
E-mail: vasta@teihal.gr, vasta@teiste.gr

^b School of Chemical Engineering, National Technical University of Athens, 15780 Athens, Greece

^c Materials Industrial Research & Technology Center S.A., 72nd km of Athens-Lamia National Road, P.O. Box 18646, GR 34100 Chalkida, Greece

^d Institut für Energieforschung und Physikalische Technologien, Clausthal University of Technology, Robert-Koch-Str. 42, 38678 Clausthal Zellerfeld, Germany

^e Clausthaler Zentrum für Materialforschung (CZM), Agricola Str. 2, Clausthal Zellerfeld, Germany

Abstract

Apatite-type lanthanum silicates (ATLS) are attracting great interest as a new class of solid electrolytes possessing high oxide-ion conductivity at relatively low temperatures for solid oxide fuel cells (SOFC). In this study, doped ATLS of the composition La_9.83Si_6−x−yAl_xFe_yO_26±δ (x: 0, 0.25, 0.75, 1.5 and/or y: 0, 0.25, 0.75, 1.5) were successfully prepared by solid state chemistry. They were brought into direct contact with CROFER-22 interconnector alloy in order to study Cr migration into the electrolyte. Due to inconclusive SEM-EDX results, a depth profile was acquired by Laser Induced Breakdown Spectroscopy (LIBS) and the results showed that the increase of Fe concentration in the apatite oxide's composition enhanced Cr uptake. At the same time, lower conductivity values were measured for the materials after Cr contamination i.e. in Fe containing ATLS. No significant change in conductivity was found for Fe-free ATLS sample.

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DOI: https://doi.org/10.1039/C6RA02025A
Article type: Paper
Submitted: 22 Jan 2016
Accepted: 04 May 2016
First published: 05 May 2016
This article is Open Access

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RSC Adv., 2016,6, 49429-49435

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Compositional effect of Cr contamination susceptibility of La_9.83Si_6−x−yAl_xFe_yO_26±δ apatite-type SOFC electrolytes in contact with CROFER 22 APU

P. K. Pandis, E. Xenogiannopoulou, P. M. Sakkas, G. Sourkouni, Ch. Argirusis and V. N. Stathopoulos, RSC Adv., 2016, 6, 49429 DOI: 10.1039/C6RA02025A

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