Journal
NANO LETTERS
Volume 12, Issue 10, Pages 5423-5430Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl302995z
Keywords
Pt-bimetallic catalyst; core shell nanoparticles; oxygen reduction reaction; aberration-corrected scanning transmission electron microscopy; electron energy loss spectroscopy
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Funding
- Zentraleinrichtung fur Elektronenmikroskopie (Zelmi) of the Technical University Berlin
- U.S. DOE EERE award through General Motors [DE-EE0000458]
- Ernst Ruska Center for Microscopy and Spectroscopy with Electrons
- Forschungszentrum Juelich GmbH, Germany
- Cluster of Excellence in Catalysis (UniCat)
- DFG
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Using aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy line profiles with Angstrom resolution, we uncover novel core-shell fine structures in a series of catalytically active dealloyed PtxNi1-x core-shell nanoparticles, showing the formation of unusual near-surface Ni-enriched inner shells. The radial location and the composition of the Ni-enriched inner shells were sensitively dependent on the initial alloy compositions. We further discuss how these self-organized Ni-enriched inner shells play a key role in maintaining surface lattice strain and thus control the surface catalytic activity for oxygen reduction.
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