Impact of the Volatile Cr-Species' Attack on the Conductivity of La(Ni,Fe)$O_3$

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Stodolny, Maciej K. and Boukamp, Bernard and Berkel, Frans van (2011) Impact of the Volatile Cr-Species' Attack on the Conductivity of La(Ni,Fe)$O_3$. ECS Transactions, 35 (1). pp. 2035-2043. ISSN 1938-5862

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Abstract:This study demonstrates the detrimental impact of Cr on the electronic conductivity of a $LaNi_{0.6}Fe_{0.4}O_3$ (LNF) porous cathode layer at 800 ºC. 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 whole cross-section of the LNF-layer. Transmission electron microscopy revealed that Cr is gradually incorporated into the LNF-grains, while Ni is proportionally expelled. The progressing Cr deposition and penetration into the LNF-grains most likely explains the electronic conductivity drop. The Cr-poisoning impact on the electronic conductivity of the LNF porous layer is considerably smaller at 600ºC than at 800ºC. A tentative mechanism for the Cr attack and its influence on the electronic conductivity of the LNF layer will be presented.
Item Type:Article
Copyright:© 2011 ECS - The Electrochemical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/81919
Official URL:http://dx.doi.org/10.1149/1.3570194
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