20August2019

Nano-Micro Letters

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

Weiming Lv1, Ze Tong2,Yimei Yin 1,*, Jiewei Yin1, Zifeng Ma1 Abstract
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Nano-Micro Letters, , Volume 7, Issue 3, pp 268-275

First Online: 04 Apr 2015 (article)

DOI:10.1007/s40820-015-0038-4

 

Abstract

 


TG & DSC curves of LiNaSO4 and Li2CO3-Na2CO3.
As an ionic conductive functional layer of intermediate temperature solid oxide fuel cells (ITSOFC), samarium doped ceria (SDC)-LiNaSO4 nano-composites were synthesized by a sol-gel method and their properties were investigated. It was found that the content of LiNaSO4 strongly affected the crystal phase, defect concentration and conductivity of the composites. When the content of LiNaSO4 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 be 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-LiNaSO4 (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-LiNaSO4 composite may be a potential good candidate as interlayer for ITSOFC due to its high ionic conductivity and thermal stability.

 

Keywords

Nano-composite; SDC-LiNaSO4; Ionic conductor; Solid oxide fuel cell

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