Solving the Structure of Size-Selected Pt Nanocatalysts Synthesized by Inverse Micelle Encapsulation

    Authors

    B. R. Cuenya; J. R. Croy; S. Mostafa; F. Behafarid; L. Li; Z. F. Zhang; J. C. Yang; Q. Wang;A. I. Frenkel

    Comments

    Authors: contact us about adding a copy of your work at [email protected]

    Abbreviated Journal Title

    J. Am. Chem. Soc.

    Keywords

    RAY-ABSORPTION-SPECTROSCOPY; ENVIRONMENTAL ELECTRON-MICROSCOPY; SUPPORTED METAL NANOPARTICLES; DEPENDENT CATALYTIC-ACTIVITY; L-EDGE; XANES; ATOMIC-SCALE; PLATINUM NANOPARTICLES; COLLOIDAL SOLUTION; FINE-STRUCTURE; SHAPE; Chemistry, Multidisciplinary

    Abstract

    The structure, size, and shape of gamma-Al(2)O(3)-supported Pt nanoparticles (NPs) synthesized by inverse micelle encapsulation have been resolved via a synergistic combination of imaging and spectroscopic tools. It is shown that this synthesis method leads to 3D NP shapes even for subnanometer clusters, in contrast to the raft-like structures obtained for the same systems via traditional deposition-precipitation methods. Furthermore, a high degree of atomic ordering is observed for the micellar NPs in H(2) atmosphere at all sizes studied, possibly due to H-induced surface reconstruction in these high surface area clusters. Our findings demonstrate that the influence of NP/support interactions on NP structure can be diminished in favor of NP/adsorbate interactions when NP catalysts are prepared by micelle encapsulation methods.

    Journal Title

    Journal of the American Chemical Society

    Volume

    132

    Issue/Number

    25

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    8747

    Last Page

    8756

    WOS Identifier

    WOS:000279196500039

    ISSN

    0002-7863

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