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Influence of support morphology on the bonding of molecules to nanoparticles

DOI: 10.1073/pnas.1506939112 DOI Help
PMID: 26080433 PMID Help

Authors: Chi Ming Yim (University College London (UCL)) , Chi Lun Pang (University College London) , Diego R. Hermoso (Universidad Autonoma de Madrid) , Coinneach Dover (University College London (UCL)) , Chris Muryn (University of Manchester) , Francesco Maccherozzi (Diamond Light Source) , Sarnjeet Dhesi (Diamond Light Source) , Rubén Pérez (Universidad Autonoma de Madrid) , Geoff Thornton (London Centre for Nanotechnology and Department of Chemistry, University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Proceedings Of The National Academy Of Sciences

State: Published (Approved)
Published: June 2015
Diamond Proposal Number(s): 6485

Abstract: Supported metal nanoparticles form the basis of heterogeneous catalysts. Above a certain nanoparticle size, it is generally assumed that adsorbates bond in an identical fashion as on a semiinfinite crystal. This assumption has allowed the database on metal single crystals accumulated over the past 40 years to be used to model heterogeneous catalysts. Using a surface science approach to CO adsorption on supported Pd nanoparticles, we show that this assumption may be flawed. Near-edge X-ray absorption fine structure measurements, isolated to one nanoparticle, show that CO bonds upright on the nanoparticle top facets as expected from single-crystal data. However, the CO lateral registry differs from the single crystal. Our calculations indicate that this is caused by the strain on the nanoparticle, induced by carpet growth across the substrate step edges. This strain also weakens the CO–metal bond, which will reduce the energy barrier for catalytic reactions, including CO oxidation.

Subject Areas: Chemistry, Materials

Instruments: I06-Nanoscience

Added On: 21/06/2015 10:45

Discipline Tags:

Physical Chemistry Catalysis Chemistry Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Near Edge X-ray Absorption Fine Structures (NEXAFS)