Electronic properties and charge transfer phenomena in Pt nanoparticles on gamma-Al2O3: size, shape, support, and adsorbate effects

    Authors

    F. Behafarid; L. K. Ono; S. Mostafa; J. R. Croy; G. Shafai; S. Hong; T. S. Rahman; S. R. Bare;B. R. Cuenya

    Comments

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    Abbreviated Journal Title

    Phys. Chem. Chem. Phys.

    Keywords

    RAY-ABSORPTION SPECTROSCOPY; NEGATIVE THERMAL-EXPANSION; GAMMA-ALUMINA; SURFACES; EDGE STRUCTURES XANES; HYDROGEN ADSORPTION; PARTICLE-SIZE; DISSOCIATIVE CHEMISORPTION; MICELLE ENCAPSULATION; PLATINUM CLUSTERS; VALENCE ORBITALS; Chemistry, Physical; Physics, Atomic, Molecular & Chemical

    Abstract

    This study presents a systematic detailed experimental and theoretical investigation of the electronic properties of size-controlled free and gamma-Al2O3-supported Pt nanoparticles (NPs) and their evolution with decreasing NP size and adsorbate (H-2) coverage. A combination of in situ X-ray absorption near-edge structure (XANES) and density functional theory (DFT) calculations revealed changes in the electronic characteristics of the NPs due to size, shape, NP-adsorbate (H-2) and NP-support interactions. A correlation between the NP size, number of surface atoms and coordination of such atoms, and the maximum hydrogen coverage stabilized at a given temperature is established, with H/Pt ratios exceeding the 1 : 1 ratio previously reported for bulk Pt surfaces.

    Journal Title

    Physical Chemistry Chemical Physics

    Volume

    14

    Issue/Number

    33

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    11766

    Last Page

    11779

    WOS Identifier

    WOS:000307017800023

    ISSN

    1463-9076

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