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As an ionic conductive functional layer of intermediate temperature solid oxide fuel cells (ITSOFC), samarium-doped ceria (SDC)-LiNaSO 4 nano-composites were synthesized by a sol-gel method and their properties were investigated. It was found that the content of LiNaSO 4 strongly affected the crystal phase, defect concentration, and conductivity of the composites. When the content of LiNaSO 4 was 20 wt%, the highest conductivity of the composite was found to be, respectively, 0.22, 0.26, and 0.35 S cm -1 at temperatures of 550, 600, and 700 °C, which are much higher than those of SDC. The peak power density of the single cell using this composite as an interlayer was improved to, respectively, 0.23, 0.39, and 0.88 W cm -2 at 500, 600, and 700 °C comparing with that of the SDC-based cell. Further, the SDC-LiNaSO 4 (20 wt%)-based cell also displayed better thermal stability according to the performance measurements at 560 °C for 50 h. These results reveal that SDC-LiNaSO 4 composite may be a potential good candidate as interlayer for ITSOFC due to its high ionic conductivity and thermal stability.

Novel Nano-composites SDC–LiNaSO4 as Functional Layer for ITSOFC