Impact of Cr-poisoning on the conductivity of $LaNi_{0.6}Fe_{0.4}O_3$


Stodolny, M.K. and Boukamp, B.A. and Blank, D.H.A. and Berkel, F.P.F. van (2011) Impact of Cr-poisoning on the conductivity of $LaNi_{0.6}Fe_{0.4}O_3$. Journal of Power Sources, 196 (22). pp. 9290-9298. ISSN 0378-7753

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Abstract:This study demonstrates the significant impact of Cr on the electronic conductivity of a LaNi0.6Fe0.4O3 (LNF) porous cathode layer at 800 °C. Vapor transport of Cr-species, originating from a porous metallic foam, and subsequent reaction with LNF, results in a decrease of the electronic conductivity of the LNF-layer. Cr has been detected throughout the entire cross-section of a 16 μm thick LNF layer, while Ni, besides its compositional distribution in the LNF layer, has also been found in enriched spots forming Ni-rich metal oxide crystals. Transmission electron microscopy revealed that Cr is gradually incorporated into the LNF-grains, while Ni is proportionally expelled. Electron diffraction performed in the center of a sliced grain showed the initial rhombohedral crystal structure of LNF, whereas diffraction performed close to the edge of the grain revealed the orthorhombic perovskite crystal structure, indicating a Cr-enriched perovskite phase. Progressive Cr deposition and penetration into the LNF grains and necks explains the electronic conductivity deterioration. The impact of Cr-poisoning on the electronic conductivity of the LNF porous layer is considerably smaller at 600 °C than at 800 °C.
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Copyright:© 2011 Elsevier
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