Scale Up and Anode Development for La-Doped SrTiO_3 Anode-Supported SOFCs

摘要

The possibility of developing large solid oxide fuel cell (SOFC) stacks based upon 25 cm~2 ceramic oxide anode-supported cells is investigated. Planar fuel cells comprising strontium titanate-based anode support impregnated with active catalysts were prepared using a combination of deposition techniques. The fuel cell tests performed in a semisealed rig have shown power densities of 185 mW cm~(-2) at 850℃ using humidified hydrogen as fuel and air as oxidant. The structure and evolution of the catalytically active impregnated materials-10 mol% Gd-doped CeO_2 and nickel- are analysed using electron microscopy at the end of the fuel cell test, revealing that a ceria and nickel layer surrounds the titanate backbone grains while ~50-150 nm spherical-like nickel particles uniformly decorate this top layer.