Electronic properties and charge transfer phenomena in Pt nanoparticles on gamma-Al2O3: size, shape, support, and adsorbate effects
Abbreviated Journal Title
Phys. Chem. Chem. Phys.
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
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.
Physical Chemistry Chemical Physics
"Electronic properties and charge transfer phenomena in Pt nanoparticles on gamma-Al2O3: size, shape, support, and adsorbate effects" (2012). Faculty Bibliography 2010s. 2282.