Influence of Mg-doped on the Microstructure and Oxygen StorageCapacity of Ce_(0.5)Zr_(0.5)O_2

摘要

Mg-doped Ce_(0.5)Zr_(0.5)O_2 nanocrystalline powders were prepared via hydrothermal method through homogeneous nucleation at 453K followed by calcinations at 673K. The effect of Mg-doping concentrations on the structure and performances of Ce_(0.5)Zr_(0.5)O_2 was studied. The results showed that Mg-doped Ce_(0.5)Zr_(0.5)O_2 was a single fluorite-type phase and the size was about 4nm. The introduction Mg into the Ce_(0.5)Zr_(0.5)O_2 lattice limited the mobility of oxygen and made the specific surface area and oxygen storage capacity(OSC) declined at doping constant less than 4mol%; as more than 4mol%, a segregation of Mg was dispersed on surface of Ce_(0.5)Zr_(0.5)O_2 and improved the thermal stability of surface, thus enhanced the OSC performance.