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Study on the Cr deposition and poisoning phenomenon at (La0.6Sr0.4)(Co0.2Fe0.8)O3-d electrode of solid oxide fuel cells by transmission X-ray microscopy

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Authors
Chen, X.
Jin, C.
Zhao, Ling
Zhang, L.
Guan, C.
Wang, L.
Song, Y.
Wang, C.
Wang, J.
Jiang, San Ping
Date
2014
Type
Journal Article

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Chen, X. and Jin, C. and Zhao, L. and Zhang, L. and Guan, C. and Wang, L. and Song, Y. et al. 2014. Study on the Cr deposition and poisoning phenomenon at (La0.6Sr0.4)(Co0.2Fe0.8)O3-d electrode of solid oxide fuel cells by transmission X-ray microscopy. International Journal of Hydrogen Energy. 39 (28): pp. 15728-15734.
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International Journal of Hydrogen Energy
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Department of Chemical Engineering
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Abstract

Herein, Cr deposition and poisoning behavior at the commonly used (La0.6Sr0.4)(Co0.2Fe0.8)O3d (LSCF) electrode of solid oxide fuel cells (SOFCs) is investigated. Three-dimension (3D)microstructure evolution of the porous electrode caused by Cr deposition during the polarizationtest at 900 C in the presence of a FeeCr metallic interconnect is characterized forthe first time using the transmission X-ray microscopy (TXM) technique. The resultsindicate that a layer of solid Cr deposits ~1.7 mm in thickness is formed on the electrodesurface, significantly reducing the linear porosity to ~2% in the surface region from ~25%in the bulk, which explains the retarded gas diffusion process at the LSCF electrode after Crdeposition. The well-established relationship between the macroscopic performancedegradation and the microstructure evolution confirms the promising application of TXMtechnique for in-depth study of the degradation phenomenon at the electrode of SOFCs.