Partial encapsulation of Pd particles by reduced ceria-zirconia

H. P. Sun, X. P. Pan, G. W. Graham, H. W. Jen, R. W. McCabe, S. Thevuthasan, C. H.F. Peden

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    Direct observation of metal-oxide interfaces with atomic resolution can be achieved by cross-sectional high-resolution transmission electron microscopy (HRTEM). Using this approach to study the response of a model, single-crystal thin film automotive exhaust-gas catalyst, Pd particles supported on the (111) ceria-zirconia (CZO) surface, to a redox cycle, we have found two distinct processes for the partial encapsulation of the Pd particles by the reduced CZO surface that depend on their relative crystallographic orientations. In the case of the preferred orientation found for Pd particles on CZO, Pd (111) [110] CZO (111) [110], a flat and sharp metal/oxide interface was maintained upon reduction, while ceria-zirconia from the adjacent surface tended to accumulate on and around the Pd particle. In rare cases, Pd particles with other orientations tended to sink into the oxide support upon reduction. Possible mechanisms for these encapsulation processes are proposed.

    Original languageEnglish
    Article number201915
    Pages (from-to)1-3
    Number of pages3
    JournalApplied Physics Letters
    Issue number20
    Publication statusPublished - 14 Nov 2005


    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Sun, H. P., Pan, X. P., Graham, G. W., Jen, H. W., McCabe, R. W., Thevuthasan, S., & Peden, C. H. F. (2005). Partial encapsulation of Pd particles by reduced ceria-zirconia. Applied Physics Letters, 87(20), 1-3. [201915].