Journal
NANO LETTERS
Volume 18, Issue 12, Pages 7870-7875Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03666
Keywords
Core/shell; interface; nanorod; oxygen reduction; seed-mediated synthesis
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Funding
- U.S. National Science Foundation [DMR-1809700]
- Thomas F. and Kate Miller Jeffress Memorial Trust
- U.S. Department of Energy, Energy Efficiency and Renewable Energy, Fuel Cell Technology Office
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC-00112704]
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Nanostructures with nonprecious metal cores and Pt ultrathin shells are recognized as promising catalysts for oxygen reduction reaction (ORR) to enhance Pt efficiency through core/shell interfacial strain and ligand effects. However, core/shell interaction within a real catalyst is complex and due to the presence of various interfaces in all three dimensions is often oversimply interpreted. Using Co2P/Pt core/shell structure as a model catalyst, we demonstrate, through density functional theory (DFT) calculations that forming Co2P(001)/Pt(111) interface can greatly improve Pt energetics for ORR, while Co2P(010)/Pt(111) is highly detrimental to ORR catalysis. We develop a seed-mediated approach to core/shell Co2P/Pt nanorods (NRs) within which Co2P(001)/Pt(111) interface is selectively expressed over the side facets and the undesired Co2P(010)/Pt(111) interface is minimized. The resultant Co2P/Pt NRs are highly efficient in catalyzing ORR in acid, superior to benchmark CoPt alloy and Pt nanoparticle catalyst. As the first example of one-dimensional (1D) core/shell nanostructure with an ultrathin Pt shell and a nonprecious element core, this strategy could be generalized to develop ultralow-loading precious-metal catalysts with favorable core/shell interactions for ORR and beyond.
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