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Issue 2, 2015
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Stability and spinodal decomposition of the solid-solution phase in the ruthenium–cerium–oxide electro-catalyst

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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.

Graphical abstract: Stability and spinodal decomposition of the solid-solution phase in the ruthenium–cerium–oxide electro-catalyst

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Publication details

The article was received on 15 Sep 2014, accepted on 28 Oct 2014 and first published on 29 Oct 2014


Article type: Paper
DOI: 10.1039/C4CP04131C
Citation: Phys. Chem. Chem. Phys., 2015,17, 1156-1164

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    Stability and spinodal decomposition of the solid-solution phase in the ruthenium–cerium–oxide electro-catalyst

    Y. Li, X. Wang, Y. Shao, D. Tang, B. Wu, Z. Tang and W. Lin, Phys. Chem. Chem. Phys., 2015, 17, 1156
    DOI: 10.1039/C4CP04131C

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