Preparation of Sm~(3+) and Nd~(3+) Co-Doped Ceria Diffusion Barriers for IT-SOFCs through a Step-Wise Sintering Method

摘要

In this paper, single-phase Sm~(3+) and Nd~(3+) co-doped ceria (SNDC) nano-powder was synthesized and the compatibility with La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8) was verified. Three types of SNDC slurries made of powders calcined at different temperatures were prepared and screen printed on YSZ substances and a novel step-wise sintering process sintering was performed to study the sintering behavior of each sample and to determine the difference with conventional sintering. The results indicate that the step-wise sintering with a low heating rate and the powder with a proper bulk density are beneficial to the densification of SNDC barriers. A minimum ASR value of 0.024 Ωcm~2 was obtained at 750°C in SNDC-950 barriers which also exhibits the highest film density.