Oh, Seol Hee Kim, Hyun-Kyu Park, Sun-Young Kim, Yeong-Cheol Kwon, Deok-Hwang Yang, Sungeun Ji, Ho-Il Chang, Hye Jung Yoon, Kyung Joong Son, Ji-Won Lee, Jong-Ho 2024-07-18T05:30:42Z 2024-07-18T05:30:42Z 2024-07-18 2024-08 2050-7488 https://pubs.kist.re.kr/handle/201004/150255 Over the past few decades, CeO2-ZrO2 (CZO) solid solutions have rapidly replaced conventional CeO2 as a support material in three-way catalysts (TWCs) because of their superior oxygen releasing/storing capability. However, the phase stability of CZO has long been controversial as can be inferred from many conflicting reports on its structural or compositional stability. In a recent experimental observation, it was noted for the first time that even the solid solution can be completely separated into ceria and zirconia. This finding adds a new layer to the existing confusing controversy, thereby constraining the appropriate utilization of this material. Therefore, in order to elucidate the precise cause and mechanism behind the controversial phase evolution phenomena associated with phase instability, we performed a well-defined model experiment with epitaxial Ce0.75Zr0.25O2 thin films and systematically observed the detailed structural and compositional changes at each stage of the evolution process. Furthermore, in order to ascertain the precise driving force and the underlying reaction mechanism that can be used to manipulate the breakdown or onset of such phase evolution, we calculated the grand potentials for not only the initial phase but also all intermediate and final phases that appear during the phase evolution reaction by using ab initio thermodynamics based on DFT. English Royal Society of Chemistry Investigating the nano-scale structure and composition dynamics during the phase transition towards complete separation of CeO2-ZrO2 solid solutions Article 10.1039/d4ta02923b 1 Journal of Materials Chemistry A, v.12, no.32, pp.21148 - 21155 Journal of Materials Chemistry A 12 32 21148 21155 Y scie scopus 001262875400001 2-s2.0-85197506002 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article