Shrinkage Control of NiO-Ce_0.9Gd_0.1O_1.95 Composites for Solid Oxide Fuel Cell Anode Substrate

Abstract

In recent years, solid oxide fuel cells (SOFCs) operated at intermediate temperature range (500-800°C) are extensively researched due to cost reduction and wider applications. Co-sintering processing technology by combination of Ce_0.9Gd_0.1O_1.95 (CGO) slurry and NiO-CGO composite is significantly important for such SOFC fabrication. In this study, we tried to control shrinkage and microstructure of NiO-CGO composites using several different types of NiO and CGO powders. We developed two different types of NiO-CGO composites. One is for conventional process and another is high shrinkage type for thinner CGO electrolyte formation. Finally, co-sintering process at 1400°C was also tried using the high shrinkage NiO-CGO composite and water-based CGO slurry, and thin CGO film was successfully formed on the NiO-CGO composite substrate. The microstructure of the NiO-CGO substrate is uniform and show to be the minute composite which can be expected low polarization resistance.