Mayuree Sansernnivet and Pimpa Limthongkul

pp. 669 - 673

Abstract

Bismuth ruthenate pyrochlores, potential cathode materials for intermediate temperature solid oxide fuel cells (ITSOFCs), were prepared via solid-state and sol-gel method. Effects of the preparation routes and conditions on the phase and microstructures of the materials were investigated in this study using XRD and SEM. The study showed that the preparation method and the adding sequence of the starting meterials have a significant effect on the crystal phase and the particle size obtained. Sol-gel synthesis could yield a material with only pyrochlore structure, i.e. Bi₂Ru₂O₇ , while the solid
state method yielded powder with a small amount of the secondary RuO₂
 phase. The sol-gel synthesis resulted in materials with a finer particle size (~0.3-1.0 µm) compared to powder synthesized via the solid state reaction method.