Journal Article

PreJuSER-3555

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spinel and Perovskite Protection Layers Between Crofer22APU and La0.8Sr0.2FeO3 Cathode Materials for SOFC Interconnects

Montero, X.FZJ* ; Jordan, N.FZJ* ; Piron-Abellan, J.FZJ* ; Tietz, F.FZJ* ; Stöver, D.FZJ* ; Cassir, M.FZJ* ; Villarreala, I.FZJ*

2009
Electrochemical Society Pennington, NJ

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Please use a persistent id in citations: doi:10.1149/1.3025914

Abstract: The interaction of the metallic interconnects with the cathode and the resulting time-dependent resistance of these material combinations is a major problem in solid oxide fuel cells (SOFCs). In this study, different conductive oxide coatings were used as protective layers to improve surface stability and electrical performance, as well as to mitigate or prevent chromium poisoning of the cells. Dense layers were obtained on the steel by electron-beam physical vapor deposition, by screen printing and by electroplating. The degradation of the interface between the coated Crofer22APU alloy and the La0.8Sr0.2FeO3 (LSF) cathode was studied by resistance measurements in air at 800 degrees C up to 1000 h and analyzed by scanning electron microscopy, energy-dispersive X-ray analysis, X-ray diffraction, and secondary ion mass spectrometry after exposure. La0.6Sr0.4FeO3 measured the lowest resistance between the tested coatings. The highest resistance was found for CeO2, which also showed low protection against SrCrO4 formation. Y2O3 exhibited the lowest resistance increase; however, this coating was not protective enough to prevent the formation of SrCrO4, especially during cyclic operation. Among the Mn-Co-Fe spinel compositions tested, the lowest resistivity values and the highest Cr retention were obtained with the MnCo1.9Fe0.1O4 spinel.

Keyword(s): J ; electrical resistivity (auto) ; electrochemical electrodes (auto) ; electron beam deposition (auto) ; electroplating (auto) ; protective coatings (auto) ; scanning electron microscopy (auto) ; secondary ion mass spectra (auto) ; solid oxide fuel cells (auto) ; vapour deposited coatings (auto) ; X-ray chemical analysis (auto) ; X-ray diffraction (auto)

Note: The authors gratefully acknowledge provision of materials by the Real-SOFC programme. This work was financially supported by the strategic action GENEDIS (Etortek) of the Basque Country Government. The authors thank Dr. D. Sebold (Forschungszentrum Julich GmbH, Institute for Materials and Processes in Energy Systems) and S. Borensztajn [Laboratoire Interfaces et Systemes Electrochimique (UMR7575)] for the SEM/EDX analyses, Dr. U. Breuer (Forschungszentrum Julich GmbH, Zentralabteilung fur Chemische Analysen) for the TOF-SIMS analyses, and Dr. O. Majerus from Laboratoire de Chimie de la Matiere Condens at Ecole Nationale Superieure de Chimie de Paris for the XRD analyses. X. M. also thanks IEF-1 as host institution for continuous support of his Ph.D. work.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEF-1)
2. Werkstoffstruktur und Eigenschaften (IEF-2)
3. Jülich-Aachen Research Alliance - Energy (JARA-ENERGY)

Research Program(s):

1. Rationelle Energieumwandlung (P12)
2. SOFC - Solid Oxide Fuel Cell (SOFC-20140602) (SOFC-20140602)

Appears in the scientific report 2009

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