Fabrication and Characterization of LaGaO_3 Thin Film Electrolyte Solid Oxide Fuel Cells with Sr_2Fe_(1.5)Mo_(0.5)O_(6-δ) Electrode

摘要

Thin film La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ) (LSGM) has been successfully fabricated as an electrolyte layer on an anode-supported substrate at 700°C with the pulsed laser deposition (PLD) technique. Sr_2Fe_(1.5)Mo_(0.5)O_(6-δ) (SFM) as both anode and cathode materials is discussed in this work. As the anode part, SFM is ball-milled with different weight ratios (10,20,30 wt %) of starch as pore former to achieve an anode layer with adequate porosity and good mechanical stability. Also, the sintering temperatures of the SFM anode layers (1150, 1200,1250,1350°C) are investigated to find an optimum porosity for catalytic reaction and thin film electrolyte deposition. Characterization of the micro structure morphology indicates that the proper anode composition is SFM with 10 wt % starch sintering at 1200°C. A 7 μm-thick LSGM electrolyte layer is dense and no cracks are found at the interface between anode and electrolyte. Pure SFM is painted onto the electrolyte and calcined at 1150°C as the cathode layer. The post-annealing process of the deposited LSGM film is also included in the cathode firing procedure. No reaction between SFM electrode and LSGM electrolyte occurs.