Impact of the Volatile Cr-species' Attack on the Conductivity of La(Ni,Fe)O3

M.K. Stodolny, Bernard A. Boukamp, Frans van Berkel

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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.
Original languageUndefined
Pages (from-to)2035-2043
Number of pages9
JournalECS transactions
Volume35
Issue number1
DOIs
Publication statusPublished - 2011

Keywords

  • METIS-280136
  • IR-81919

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