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Counting electrons on supported nanoparticles

Combination of synchrotron based PES, STM and DFT shows dependence of charge transfer between Pt nanoparticles and oxide support on the particle size.

  Lykhach et al.,  Nature Materials 15 (2016) 284-288


Electronic interactions between metal nanoparticles and oxide supports control the functionality of nanomaterials, for example, the stability, the activity and the selectivity of catalysts1, 2, 3, 4, 5. Such interactions involve electron transfer across the metal/support interface. In this work we quantify this charge transfer on a well-defined platinum/ceria catalyst at particle sizes relevant for heterogeneous catalysis. Combining synchrotron-radiation photoelectron spectroscopy, scanning tunnelling microscopy and density functional calculations we show that the charge transfer per Pt atom is largest for Pt particles of around 50 atoms. Here, approximately one electron is transferred per ten Pt atoms from the nanoparticle to the support. For larger particles, the charge transfer reaches its intrinsic limit set by the support.

For smaller particles, charge transfer is partially suppressed by nucleation at defects. These mechanistic and quantitative insights into charge transfer will help to make better use of particle size effects and electronic metal–support interactions in metal/oxide nanomaterials.

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Counting electrons on supported nanoparticles
Y. Lykhach, S. Kozlov, T. Skála, A. Tovt, V. Stetsovych, N. Tsud, F. Dvořák, V. Johánek, A. Neitzel, J. Mysliveček, S. Fabris, V. Matolín, K. Neyman, J. Libuda
Nature Materials 15 (2016) 284-288

DOI:
10.1038/nmat4500
Ultima modifica il Sabato, 23 Aprile 2016 16:00