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1 Department of Energy Conversion and Storage, Technical University of Denmark 2 Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark 3 Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark 4 Universidad Autonoma de Barcelona 5 Catalonia Institute for Energy Research
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-δ as a good alternative for fabricating reliable micro solid oxide fuel cells for intermediate temperature applications. © 2013 Elsevier B.V. All rights reserved.
Journal of Power Sources, 2014, Vol 248, p. 1042-1049
Micro solid oxide fuel cell; Thin film cathode; Self-supported electrolyte; Lanthanum strontium cobaltite; Microelectromechanical systems
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