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Research Article | Open Access

Catalytic Properties of Pt Cluster-Decorated CeO2 Nanostructures

Feng Lin1,2, Dat Tien Hoang1, Chia-Kuang Tsung1,3, Wenyu Huang1, Sylvia Hsiao-Yun Lo1, Jennifer B. Wood1, Hungta Wang1, Jinyao Tang1, Peidong Yang1( )
Department of ChemistryUniversity of California, BerkeleyCalifornia94720USA
Department of ChemistryTsinghua UniversityBeijing100084China
Department of ChemistryMerkert Chemistry CenterBoston College, 2609 Beacon Street, Chestnut HillMassachusetts02467USA
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Abstract

Uniform clusters of Pt have been deposited on the surface of capping-agent-free CeO2 nanooctahedra and nanorods using electron beam (e-beam) evaporation. The coverage of the Pt nanocluster layer can be controlled by adjusting the e-beam evaporation time. The resulting e-beam evaporated Pt nanocluster layers on the CeO2 surfaces have a clean surface and clean interface between Pt and CeO2. Different growth behaviors of Pt on the two types of CeO2 nanocrystals were observed, with epitaxial growth of Pt on CeO2 nanooctahedra and random growth of Pt on CeO2 nanorods. The structures of the Pt clusters on the two different types of CeO2 nanocrystals have been studied and compared by using them as catalysts for model reactions. The results of hydrogenation reactions clearly showed the clean and similar chemical surface of the Pt clusters in both catalysts. The support-dependent activity of these catalysts was demonstrated by CO oxidation. The Pt/CeO2 nanorods showed much higher activity compared with Pt/CeO2 nanooctahedra because of the higher concentration of oxygen vacancies in the CeO2 nanorods. The structure-dependent selectivity of dehydrogenation reactions indicates that the structures of the Pt on CeO2 nanorods and nanooctahedra are different. Thes differences arise because the metal deposition behaviors are modulated by the strong metal-metal oxide interactions.

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Keywords

Nanocrystalsnanoclustersinterfacecatalysis

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Nano Research
Volume 4 Issue 1,
January 2011
Pages 61-71
DOI: 10.1007/s12274-010-0042-4

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Cite this article:
Lin F, Hoang DT, Tsung C-K, et al. Catalytic Properties of Pt Cluster-Decorated CeO2 Nanostructures. Nano Research, 2011, 4(1): 61-71. https://doi.org/10.1007/s12274-010-0042-4

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Received: 24 August 2010
Revised: 09 September 2010
Accepted: 09 September 2010
Published: 21 October 2010
© The Author(s) 2010

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.