Mechanical strengthening of Sm-doped CeO2 ceramics by 1 mol% cobalt oxide for solid oxide fuel cell application

Publication year: 2011
Source: Journal of Power Sources, In Press, Accepted Manuscript, Available online 13 June 2011

Yingchao, Dong , Stuart, Hampshire , Jian-er, Zhou , Xinfa, Dong , Bin, Lin , …

Combustion processed nano-sized Ce0.79Sm0.20Co0.01O2-δ (CSCoO) and Ce0.80Sm0.20O2-δ (CSO) were sintered at various temperatures, and mechanical properties and microstructures were characterized. The results demonstrate that besides a lowering of sintering temperature to achieve sufficient densification, the doping of very minor amounts of CoO (1 mol%) to CSO significantly enhanced mechanical properties. The CSCoO sintered at 1100°C exhibits a biaxial flexural strength of 354±42MPa which compared with 194±57MPa for CSO with a similar relative density sintered at 1400°C. This slight modification in chemical composition also resulted in a slight improvement in micro-hardness.