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Core shell compositional fine structures of dealloyed PtN particles

September 1, 2012

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Core-shell compositional fine structures of dealloyed PtN nanoparticles and their impact on oxygen reduction catalysis

by Lin Gan, Marc Heggen, Stefan Rudi and Peter Strasser

Using aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy line profiles with Ångström resolution, novel core-shell fine structures in a series of catalytically active dealloyed Pt_(x)Ni(1-x) core-shell nanoparticles have been uncovered, showing the formation of unusual near-surface Ni-enriched inner shells. The radial location and the composition of the Ni-enriched inner shells were found to be sensitively dependent on the initial alloy compositions. It is discussed how these self-organised Ni-enriched inner shells play a key role in maintaining surface lattice strain and thus control the surface catalytic activity for oxygen reduction.


Further reading:

Lin Gan, Marc Heggen, Stefan Rudi and Peter Strasser: Core shell compositional fine structures of dealloyed PtN nanoparticles and their impact on oxygen reduction catalysis, Nano Letters xxx (2012) yyy


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