Facet-Dependent Deposition of Highly Strained Alloyed Shells on Intermetallic Nanoparticles for Enhanced Electrocatalysis

Wang, Chenyu; Sang, Xiahan; Gamler, Jocelyn T. L.; Chen, Dennis P.; Unocic, Raymond R.; Skrabalak, Sara E.

doi:10.1021/acs.nanolett.7b02239

Title: Facet-Dependent Deposition of Highly Strained Alloyed Shells on Intermetallic Nanoparticles for Enhanced Electrocatalysis

Journal Article · Fri Aug 25 00:00:00 EDT 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b02239· OSTI ID:1378291

Wang, Chenyu ^[1];

^[2]; Gamler, Jocelyn T. L. ^[1]; Chen, Dennis P. ^[1]; Unocic, Raymond R. ^[2];

^[1]

Department of Chemistry, Indiana University, Bloomington, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, Tennessee 37831 United States

Compressive 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 (fcc) Pt- Cu random alloy shells were deposited non-epitaxially on PdCu B2 intermetallic seeds, giving rise to faceted core@shell NPs with highly strained surfaces. In fact, high resolution transmission electron microscopy (HRTEM) revealed orientation-dependent surface strains, where the compressive strains were minimal on Pt-Cu {111} facets but greater on {200} facets. These core@shell NPs provide higher specific and mass activities for the ORR when compared to conventional Pt-Cu NPs. Moreover, these intermetallic@random alloy NPs displayed high endurance, undergoing 10,000 cycles with only a slight decay in activity and no apparent structural changes.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Indiana Univ., Bloomington, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0010489; AC05-00OR22725

OSTI ID:: 1378291

Alternate ID(s):: OSTI ID: 1394467; OSTI ID: 1421601

Journal Information:: Nano Letters, Journal Name: Nano Letters Vol. 17 Journal Issue: 9; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 73 works

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36 MATERIALS SCIENCE
core−shell
lattice misfit
oxygen reduction reaction
Pt-M nanoparticles
seeded growth
surface strains

Title: Facet-Dependent Deposition of Highly Strained Alloyed Shells on Intermetallic Nanoparticles for Enhanced Electrocatalysis

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