Synergetic enhancement of mechanical and electrical properties in Ce 0.8 Sm 0.1 Nd 0.1 O 2−δ /La 10 Si 6 O 27 composite electrolytes

Abstract It has been demonstrated that the samarium and neodymium codoped ceria (Ce 0.8 Sm 0.1 Nd 0.1 O 2−δ abbreviated SNDC ) shows high ionic conductivity at intermediate operating temperature (0.012 S/cm at 500°C. However, the poor mechanical properties limited its applications in solid fuel cell...

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Published in:Journal of the American Ceramic Society 2018-07, Vol.101 (7), p.3130-3137
Main Authors: Yuan, Yajie, Li, Tianjun, Nishijima, Hiroki, Pan, Wei, Gong, Jianghong, Wang, Kai, Wang, Min, Zhang, Mengfei, Zhao, Xiaohui
Format: Article
Language:English
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Summary:Abstract It has been demonstrated that the samarium and neodymium codoped ceria (Ce 0.8 Sm 0.1 Nd 0.1 O 2−δ abbreviated SNDC ) shows high ionic conductivity at intermediate operating temperature (0.012 S/cm at 500°C. However, the poor mechanical properties limited its applications in solid fuel cells and oxygen sensors. Present research reports an approach to improve the mechanical properties of SNDC by adding another kind of oxide solid electrolyte, the apatite‐type lanthanum silicate (La 10 Si 6 O 27 abbreviated LSO ). The SNDC / LSO composites were prepared by mixing the powders with different proportion, and sintered at 1600°C. Their structure, morphology, mechanical, and electrical properties were characterized. It was found that with the 5wt%‐7wt% LSO addition, both the flexural strength and the fracture toughness were improved. The improvement of flexural strength for the SNDC reached as high as 71%. It is also seen that the ionic conductivity of SNDC was enhanced with the adding of 5wt% LSO . The enhanced mechanical properties and electrical conductivity of SNDC / LSO composites make them a promising candidates for high‐performance SOFC s and oxygen sensors.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15458