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Facet-Dependent Deposition of Highly Strained Alloyed Shells on Intermetallic Nanoparticles for Enhanced Electrocatalysis [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages 5,526-5,532 : digital, PDF file
Additional Creators:
Indiana University, Bloomington, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Surface strains can enhance the performance of platinum-based core@shell electrocatalysts for the oxygen reduction reaction (ORR). Bimetallic core@shell nanoparticles (NPs) are widely studied nanocatalysts but often have limited lattice mismatch and surface compositions; investigations of core@shell NPs with greater compositional complexity and lattice misfit are in their infancy. Here, a new class of multimetallic NPs composed of intermetallic cores and random alloy shells is reported. Specifically, face-centered cubic Pt–Cu random alloy shells were deposited on PdCu B2 intermetallic seeds in a facet-dependent manner, giving rise to faceted core@shell NPs with highly strained surfaces. High-resolution transmission electron microscopy revealed orientation-dependent surface strains, where the compressive strains were greater on Pt–Cu {200} than {111} facets. These core@shell NPs provide higher specific area and mass activities for the ORR when compared to conventional Pt–Cu NPs. Furthermore, these intermetallic@random alloy NPs displayed high endurance, undergoing 10,000 cycles with only a slight decay in activity and no apparent structural changes.
Report Numbers:
E 1.99:1421601
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Note:
Published through SciTech Connect.
08/25/2017.
Nano Letters 17 9 ISSN 1530-6984 AM
Chenyu Wang; Xiahan Sang; Jocelyn T. L. Gamler; Dennis P. Chen; Raymond R. Unocic; Sara E. Skrabalak.
Funding Information:
SC0010489
View MARC record | catkey: 24058203