DEVELOPMENT OF Fe/Cr ALLOY-SUPPORTED SOLID OXIDE FUEL CELL BY PLASMA TECHNIQUE

摘要

In this study, the large-scale mold for compression molding process is prepared and a compression load of 200 ton is applied to form a porous alloy specimen with dimension of 11x11x1.2 cm. The pyrolyzable filler is used in the period of manufacturing processes in order to produce porous interconnected networks of iron (Fe)-containing chromium (Cr)-based alloy. The specimens are sintered in hydrogen at the temperature of 1350°C to obtain porous alloy substrate. The flexural strength of porous alloy supporting component is measured in this work. The strength of porous alloy substrate (sintered at 1350°C) in three-point flexure at 25°C and 750°C are 158 MPa and 63 MPa, respectively. Metal-supported solid oxide fuel cells (MS-SOFCs) are fabricated by thermal plasma spraying technique and double layer formed of YSZ-NiO, GDC-NiO composite anode, a diffusion barrier layer (Ce_(0.55)La_(0.45)O_(2-δ) -NiO, LDC-NiO), electrolyte (La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3-δ), LSGM) and cathode (Sm_(0.5)Sr_(0.5)CoO_(3-δ) , SSC) functional layers are deposited onto porous alloy substrate. The 10x10 cm~2 MS-SOFC with effective electrode area of 81 cm~2 shows the open circuit voltages is 1.03 V at 750°C. The measured maximum output power densities (@0.68V) of this cell has reached 411 mW/cm~2 at 750°C by using hydrogen as fuel and air as oxidant.