Electronic transport in the novel SOFC anode material La1-xSrx Cr0.5Mn0.5O3 δ

John Thomas Sirr Irvine, SM Plint, PA Connor, S Tao

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)

Abstract

Electronic conductivity in the potential SOFC anode material La1-xSrxCr0.5Mn0.5O3 +/-delta has been investigated in the range 0.2 < x < 0.3. log(sigma T) vs. 1/T plots indicate conduction via thermally activated polaron hopping. At 900 degrees C, conductivity in air increases with Sr2+ via an increase in [B;l holes (B-transition metal). X-ray absorption spectroscopy (XAS) studies indicate that compensation for A-site Sr substitution and oxygen vacancy formation is via the Mn cation only; Cr maintains a 3+ oxidation state and 6-fold oxygen coordination. Electronic transport occurs by percolation between Mn cations in a disordered B-site sub-lattice. Conductivity decreases with p(O-2), which is indicative of p-type conduction behaviour, but the relationship cannot be explained by a simple redox equilibrium involving Mn3+, Mn4+ and oxygen, possibly due to co-existence of Mn2+, Mn3+ and Mn4+ via disproportionation as with La1-xSrxMnO3 +/-delta (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)2005-2008
Number of pages4
JournalSolid State Ionics
Volume177
DOIs
Publication statusPublished - 15 Oct 2006

Keywords

  • SOFC
  • anode
  • perovskite
  • conductivity
  • EXAFS
  • XANES
  • ELECTRICAL-CONDUCTIVITY
  • PERCOLATION

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