Fabrication of 100 Centimeter Square Metal-Supported Solid Oxide Fuel Cell Using Thermal Plasma Technique

Abstract

In this study, the large-scale mold for compression molding process is prepared and a compression load of 120 ton is applied to form a porous alloy specimen with dimension of 120×120×1.2 mm. The carbon is used as pyrolyzable filler in the period of manufacturing processes in order to produce porous interconnected networks of molybdenum (Mo)-containing nickel (Ni)-based alloy. The specimens are sintered in hydrogen at the temperature of 1250°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 1250°C) in three-point flexure at 25°C and 750°C are 188 MPa and 76.5 MPa, respectively. Metal-supported solid oxide fuel cells (MS-SOFCs) are fabricated by thermal plasma spraying technique and the anode (Ce0.55La0.45O2-δ-NiO), electrolyte (La0.8Sr0.2Ga0.8Mg0.2O3-δ) and cathode (Sm0.5Sr0.5CoO3-δ) functional layers are deposited onto porous alloy substrate. The 10×10 cm2 MS-SOFC with effective electrode area of 81 cm2 shows the open circuit voltages is 1.09 V at 700°C. The measured maximum output power densities (@0.76V) of this cell has reached 588 mW/cm2 at 700°C by employing hydrogen as fuel and air as oxidant.