title: Stability and spinodal decomposition of the solid-solution phase in the ruthenium-cerium-oxide electro-catalyst.
abstract: The phase diagram of Ru-Ce-O was calculated by a combination of ab initio density functional theory and thermodynamic calculations. The phase diagram indicates that the solubility between ruthenium oxide and cerium oxide is very low at temperatures below 1100 K. Solid solution phases, if existing under normal experimental conditions, are metastable and subject to a quasi-spinodal decomposition to form a mixture of a Ru-rich rutile oxide phase and a Ce-rich fluorite oxide phase. To study the spinodal decomposition of Ru-Ce-O, Ru0.6Ce0.4O2 samples were prepared at 280 °C and 450 °C. XRD and in situ TEM characterization provide proof of the quasi-spinodal decomposition of Ru0.6Ce0.4O2. The present study provides a fundamental reference for the phase design of the Ru-Ce-O electro-catalyst.
authors.affiliation: College of Material Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China. xinxinwx@fzu.edu.cn.
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Li
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.forename: Yanqun
authors.initials: Y
authors.lastname: Shao
authors.forename: Dian
authors.initials: D
authors.lastname: Tang
authors.forename: Bo
authors.initials: B
authors.lastname: Wu
authors.forename: Zhongzhi
authors.initials: Z
authors.lastname: Tang
authors.forename: Wei
authors.initials: W
authors.lastname: Lin