Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 4, Issue 9, Pages 3053-3063Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cy00414k
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Funding
- Institute for Atom-efficient Chemical Transformations (IACT), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- National Science Foundation [CBET-1067020]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Department of Energy
- MRCAT
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1067020] Funding Source: National Science Foundation
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For catalytic metal nanoparticles (<2 nm), structural information is rarely generated using conventional X-ray diffraction (XRD) owing to the broad peaks and partial oxidation of the nanoparticles on exposure to air. Here we report how in situ synchrotron XRD provides structural information on reduced 1-2 nm Pt nanoparticles, which are unobservable by XRD when measured in air. Furthermore, for larger metal particles (>2 nm) where diffraction patterns of the metallic phase are obtainable in air, we show that on exposure to air the surface is oxidized with a metallic core producing misleading results with respect to particle size and lattice parameter. Results from XRD are cross-correlated with scanning transmission electron microscopy and three other synchrotron X-ray techniques, small angle diffraction (SAXS), pair distribution function (PDF) and X-ray absorption spectroscopy (XAS), to provide detailed characterization of the structure of very small nanoparticles in the metallic phase.
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