Preparation of CeO2/ZrO2 modified by MgO: Roles of MgO for upgrading redox property.

Chemical Removal of CeO2 Segregated on the Surface of CeO2–ZrO2 Binary Oxides for Improvement of OSC

“…The pattern of MCZ was also assigned to Ce rich phase (Ce 0.75 Zr 0.25 O 2 ) and MgO, and the peaks from Ce rich phase became somewhat sharpen compared with those of CZ and H-CZ. This indicates that the addition of MgO promotes the formation of a single solid solution phase as an effective barrier [6]. It is noted that any peaks assigned to CeO 2 were not detected in CZ, H-CZ and MCZ.…”

“…Finally, CZ was dried at 383 K for 24 h and calcined at 773 K for 5 h (denoted as H-CZ). MgO added CeO 2 -ZrO 2 binary oxide (denoted as MCZ) also prepared using the same manner for comparison [6]. In brief, the precipitate (Ce-Zr hydroxide) with the 1/1 molar ratio of Ce/Zr was prepared as described above.…”

“…Therefore, most of studies have been focused on the synthesis of homogeneously distributed active solid solution phase in CeO 2 -ZrO 2 binary oxide and the suppression of thermal sintering of those active phases. We have reported previously that the addition of MgO not only improved the redox behavior but also assisted the formation of CZ solid solution without residual CeO 2 species in CeO 2 -ZrO 2 (1:1) binary oxide [6]. We have also investigated the redox behavior of surface CeO 2 species on CZ solid solution [10,11].…”

“…Effects of additives, e.g. Y [2,3], Al [4], Bi [5], Mg [6,7], Sr [8,9], have been also investigated in detail to reveal the structure of active phase of CZ solid solution, in which the higher mobility of oxygen was induced not only in the surface but also in the bulk by the distortion of O 2-sublattice due to the substitution of Zr 4? in ceria or by nanometer scale CZ solid solution particles stabilized by additives as a diffusion barrier.…”