Porous La0.6Sr0.4CoO3-δ thin film cathodes for large area micro solid oxide fuel cell power generators

A. Garbayo, Vincenzo Esposito, Simone Sanna, A. Morata, D. Pla, L. Fonseca, N. Sabaté

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Abstract

Porous La0.6Sr0.4CoO3-δ thin films were fabricated by pulsed laser deposition for being used as a cathode for micro solid oxide fuel cell applications as MEMS power generators. Symmetrical La0.6Sr0.4CoO3-δ/ yttria-stabilized zirconia/La0.6Sr0.4CoO3-δ free-standing membranes were fabricated using silicon as a substrate. A novel large-area membrane design based on grids of doped-silicon slabs was used. Thermomechanical stability of the tri-layer membranes was ensured in the intermediate range of temperatures up to 700 °C. In-plane conductivity of ca. 300 S cm-1 was measured for the cathode within the whole range of application temperatures. Finally, area specific resistance values below 0.3 Ω cm2 were measured for the cathode/electrolyte bi-layer at 700 °C in the exact final micro solid oxide fuel cell device configuration, thus presenting La0.6Sr0.4CoO3 as a good alternative for fabricating reliable micro solid oxide fuel cells for intermediate temperature applications.
© 2013 Elsevier B.V. All rights reserved.

Original languageEnglish
JournalJournal of Power Sources
Volume248
Pages (from-to)1042-1049
ISSN0378-7753
DOIs
Publication statusPublished - 2014

Keywords

  • Micro solid oxide fuel cell
  • Thin film cathode
  • Self-supported electrolyte
  • Lanthanum strontium cobaltite
  • Microelectromechanical systems

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