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

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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
Volume87
Issue number20
DOIs
Publication statusPublished - 14 Nov 2005
Externally publishedYes

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zirconium oxides
metal oxides
exhaust gases
sinks
catalysts
transmission electron microscopy
cycles
oxides
high resolution
single crystals
thin films

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]. https://doi.org/10.1063/1.2132067

Partial encapsulation of Pd particles by reduced ceria-zirconia. / Sun, H. P.; Pan, X. P.; Graham, G. W.; Jen, H. W.; McCabe, R. W.; Thevuthasan, S.; Peden, C. H F.

In: Applied Physics Letters, Vol. 87, No. 20, 201915, 14.11.2005, p. 1-3.

Research output: Contribution to journalArticle

Sun, HP, Pan, XP, Graham, GW, Jen, HW, McCabe, RW, Thevuthasan, S & Peden, CHF 2005, 'Partial encapsulation of Pd particles by reduced ceria-zirconia', Applied Physics Letters, vol. 87, no. 20, 201915, pp. 1-3. https://doi.org/10.1063/1.2132067
Sun HP, Pan XP, Graham GW, Jen HW, McCabe RW, Thevuthasan S et al. Partial encapsulation of Pd particles by reduced ceria-zirconia. Applied Physics Letters. 2005 Nov 14;87(20):1-3. 201915. https://doi.org/10.1063/1.2132067
Sun, H. P. ; Pan, X. P. ; Graham, G. W. ; Jen, H. W. ; McCabe, R. W. ; Thevuthasan, S. ; Peden, C. H F. / Partial encapsulation of Pd particles by reduced ceria-zirconia. In: Applied Physics Letters. 2005 ; Vol. 87, No. 20. pp. 1-3.
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