Favorable Core/Shell Interface within Co2P/Pt Nanorods for Oxygen Reduction Electrocatalysis | Zendy

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

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Favorable Core/Shell Interface within Co₂P/Pt Nanorods for Oxygen Reduction Electrocatalysis

Author(s) -

Chang Liu,

Zhong Ma,

Meiyang Cui,

Zhiyong Zhang,

Xu Zhang,

Dong Su,

Christopher B. Murray,

Jia X. Wang,

Sen Zhang

Publication year - 2018

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.8b03666

Subject(s) - catalysis , nanorod , electrocatalyst , materials science , shell (structure) , nanostructure , alloy , oxygen reduction , oxygen reduction reaction , density functional theory , chemical engineering , metal , nanotechnology , platinum , chemistry , electrochemistry , composite material , computational chemistry , metallurgy , electrode , organic chemistry , engineering

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.

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