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

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

    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

    Share

    COinS
     

    Accessibility Statement

    This item was created or digitized prior to April 24, 2027, or is a reproduction of legacy media created before that date. It is preserved in its original, unmodified state specifically for research, reference, or historical recordkeeping. In accordance with the ADA Title II Final Rule, the University Libraries provides accessible versions of archival materials upon request. To request an accommodation for this item, please submit an accessibility request form.