Favorable Core/Shell Interface within Co<sub>2</sub>P/Pt Nanorods for Oxygen Reduction Electrocatalysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 30427689.
- Also identified by DOI 10.1021/acs.nanolett.8b03666.
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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<sub>2</sub>P/Pt core/shell structure as a model catalyst, we demonstrate, through density functional theory (DFT) calculations that forming Co<sub>2</sub>P(001)/Pt(111) interface can greatly improve Pt energetics for ORR, while Co<sub>2</sub>P(010)/Pt(111) is highly detrimental to ORR catalysis. We develop a seed-mediated approach to core/shell Co<sub>2</sub>P/Pt nanorods (NRs) within which Co<sub>2</sub>P(001)/Pt(111) interface is selectively expressed over the side facets and the undesired Co<sub>2</sub>P(010)/Pt(111) interface is minimized. The resultant Co<sub>2</sub>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.