Core–Shell Compositional Fine Structures of Dealloyed PtxNi1–x Nanoparticles and Their Impact on Oxygen Reduction Catalysis
Top Cited Papers
- 19 September 2012
- journal article
- letter
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 12 (10), 5423-5430
- https://doi.org/10.1021/nl302995z
Abstract
Using aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy line profiles with Ångstrom resolution, we uncover novel core-shell fine structures in a series of catalytically active dealloyed Pt xNi 1-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. © 2012 American Chemical Society.Keywords
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