Electronic properties and charge transfer phenomena in Pt nanoparticles on γ-Al2
O3: size, shape, support, and adsorbate effects

Behafarid, Farzad; Ono, L. K; Mostafa, S.; Croy, J. R.; Shafai, G.; Hong, S.; Rahman, T. S.; Bare, Simon R.; Roldan Cuenya, Beatriz

doi:10.1039/C2CP41928A

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

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Behafarid, F., Ono, L. K., Mostafa, S., Croy, J. R., Shafai, G., Hong, S., et al. (2012). Electronic properties and charge transfer phenomena in Pt nanoparticles on γ-Al₂O₃: size, shape, support, and adsorbate effects. Physical Chemistry Chemical Physics, 14(33), 11766-11779. doi:10.1039/C2CP41928A.

Cite as: https://hdl.handle.net/21.11116/0000-0006-CD16-B

Abstract

This study presents a systematic detailed experimental and theoretical investigation of the electronic properties of size-controlled free and γ-Al₂O₃-supported Pt nanoparticles (NPs) and their evolution with decreasing NP size and adsorbate (H₂) coverage. A combination of in situX-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 (H₂) 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.