Favorable Core/Shell Interface within Co                         2                         P/Pt Nanorods for Oxygen Reduction Electrocatalysis

Chang Liu; Zhong Ma; Meiyang Cui; Zhiyong Zhang; Xu Zhang; Dong Su; Christopher B. Murray; Jia X. Wang; Sen Zhang

doi:10.1021/acs.nanolett.8b03666

Favorable Core/Shell Interface within Co ₂ P/Pt Nanorods for Oxygen Reduction Electrocatalysis

Chang Liu
, Zhong Ma
, Meiyang Cui
, Zhiyong Zhang
, Xu Zhang
, Dong Su
, Christopher B. Murray
, Jia X. Wang
, Sen Zhang

Surface Chemistry & Catalysis Group

Research output: Contribution to journal › Article › peer-review

72 Scopus citations

Abstract

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 Co ₂ P/Pt core/shell structure as a model catalyst, we demonstrate, through density functional theory (DFT) calculations that forming Co ₂ P(001)/Pt(111) interface can greatly improve Pt energetics for ORR, while Co ₂ P(010)/Pt(111) is highly detrimental to ORR catalysis. We develop a seed-mediated approach to core/shell Co ₂ P/Pt nanorods (NRs) within which Co ₂ P(001)/Pt(111) interface is selectively expressed over the side facets and the undesired Co ₂ P(010)/Pt(111) interface is minimized. The resultant Co ₂ P/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.

Original language	English
Pages (from-to)	7870-7875
Number of pages	6
Journal	Nano Letters
Volume	18
Issue number	12
DOIs	https://doi.org/10.1021/acs.nanolett.8b03666
State	Published - Dec 12 2018

Funding

This work was supported by U.S. National Science Foundation (DMR-1809700), Jeffress Trust Awards Program in Interdisciplinary Research from Thomas F. and Kate Miller Jeffress Memorial Trust and U.S. Department of Energy, Energy Efficiency and Renewable Energy, Fuel Cell Technology Office. Partial work on electron microscopy carried out at the Center for Functional Nanomaterials, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-SC-00112704.

Keywords

Core/shell
interface
nanorod
oxygen reduction
seed-mediated synthesis

Access to Document

10.1021/acs.nanolett.8b03666

Cite this

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title = "Favorable Core/Shell Interface within Co 2 P/Pt Nanorods for Oxygen Reduction Electrocatalysis",

abstract = " 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 Co 2 P/Pt core/shell structure as a model catalyst, we demonstrate, through density functional theory (DFT) calculations that forming Co 2 P(001)/Pt(111) interface can greatly improve Pt energetics for ORR, while Co 2 P(010)/Pt(111) is highly detrimental to ORR catalysis. We develop a seed-mediated approach to core/shell Co 2 P/Pt nanorods (NRs) within which Co 2 P(001)/Pt(111) interface is selectively expressed over the side facets and the undesired Co 2 P(010)/Pt(111) interface is minimized. The resultant Co 2 P/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.",

keywords = "Core/shell, interface, nanorod, oxygen reduction, seed-mediated synthesis",

author = "Chang Liu and Zhong Ma and Meiyang Cui and Zhiyong Zhang and Xu Zhang and Dong Su and Murray, \{Christopher B.\} and Wang, \{Jia X.\} and Sen Zhang",

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AU - Liu, Chang

AU - Ma, Zhong

AU - Cui, Meiyang

AU - Zhang, Zhiyong

AU - Zhang, Xu

AU - Su, Dong

AU - Murray, Christopher B.

AU - Wang, Jia X.

AU - Zhang, Sen

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