Development of anode material based on La-substituted SrTiO3 perovskites doped with manganese and/or gallium for SOFC

MJ Escuderoa, John Thomas Sirr Irvine, L Daza

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Materials based on La-substituted SrTiO3 perovskites doped with manganese and/or gallium for SOFC have been studied as novel anodes for solid oxide fuel cell. La4Sr8Ti11Mn1-xGaxO38-delta (0 <= x <= 1) oxides were synthesized by solid state reaction and the influences of the manganese and/or gallium content on the structure, morphology, thermal properties and electrical conductivity of these materials has been investigated. All compounds show cubic structure with a space group Pm-3m. These compounds presented high electrical conductivity values under reducing atmosphere between 7.9 and 6.8 S cm(-1) at 900 C. For the composition x >= 0.5, the thermal expansion coefficient in both reducing and oxidizing atmosphere are close to that of SOFC electrolytes (8YSZ, CGD). In general, the substitution of Ga by Mn causes a slight reduction in each of the following, lattice parameter, degree of oxygen loss on reduction, thermal expansion coefficient, and electrical conductivity. (C) 2008 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalJournal of Power Sources
Volume192
Issue number1
DOIs
Publication statusPublished - 1 Jul 2009

Keywords

  • Titanates
  • Perovskite
  • Electrical conductivity
  • Anode
  • SOFC
  • OXIDE FUEL-CELLS
  • ELECTRICAL-CONDUCTIVITY
  • EXTENDED DEFECTS
  • METHANE
  • TEMPERATURE
  • COEFFICIENT
  • MANGANITES
  • OXIDATION

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