Shape regulation of high-index facet nanoparticles by dealloying

Liliang Huang; Mohan Liu; Haixin Lin; Yaobin Xu; Jinsong Wu; Vinayak P. Dravid; Chris Wolverton; Chad A. Mirkin

doi:10.1126/science.aax5843

Shape regulation of high-index facet nanoparticles by dealloying

Liliang Huang, Mohan Liu, Haixin Lin, Yaobin Xu, Jinsong Wu, Vinayak P. Dravid, Chris Wolverton, Chad A. Mirkin^*

^*Corresponding author for this work

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

21 Scopus citations

Abstract

Tetrahexahedral particles (~10 to ~500 nanometers) composed of platinum (Pt), palladium, rhodium, nickel, and cobalt, as well as a library of bimetallic compositions, were synthesized on silicon wafers and on catalytic supports by a ligand-free, solid-state reaction that used trace elements [antimony (Sb), bismuth (Bi), lead, or tellurium] to stabilize high-index facets. Both simulation and experiment confirmed that this method stabilized the {210} planes. A study of the PtSb system showed that the tetrahexahedron shape resulted from the evaporative removal of Sb from the initial alloy—a shape-regulating process fundamentally different from solution-phase, ligand-dependent processes. The current density at a fixed potential for the electro-oxidation of formic acid with a commercial Pt/carbon catalyst increased by a factor of 20 after transformation with Bi into tetrahexahedral particles.

Original language	English (US)
Pages (from-to)	1159-1163
Number of pages	5
Journal	Science
Volume	365
Issue number	6458
DOIs	https://doi.org/10.1126/science.aax5843
State	Published - Sep 13 2019

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title = "Shape regulation of high-index facet nanoparticles by dealloying",

abstract = "Tetrahexahedral particles (~10 to ~500 nanometers) composed of platinum (Pt), palladium, rhodium, nickel, and cobalt, as well as a library of bimetallic compositions, were synthesized on silicon wafers and on catalytic supports by a ligand-free, solid-state reaction that used trace elements [antimony (Sb), bismuth (Bi), lead, or tellurium] to stabilize high-index facets. Both simulation and experiment confirmed that this method stabilized the {210} planes. A study of the PtSb system showed that the tetrahexahedron shape resulted from the evaporative removal of Sb from the initial alloy—a shape-regulating process fundamentally different from solution-phase, ligand-dependent processes. The current density at a fixed potential for the electro-oxidation of formic acid with a commercial Pt/carbon catalyst increased by a factor of 20 after transformation with Bi into tetrahexahedral particles.",

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AU - Huang, Liliang

AU - Liu, Mohan

AU - Lin, Haixin

AU - Xu, Yaobin

AU - Wu, Jinsong

AU - Dravid, Vinayak P.

AU - Wolverton, Chris

AU - Mirkin, Chad A.

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N2 - Tetrahexahedral particles (~10 to ~500 nanometers) composed of platinum (Pt), palladium, rhodium, nickel, and cobalt, as well as a library of bimetallic compositions, were synthesized on silicon wafers and on catalytic supports by a ligand-free, solid-state reaction that used trace elements [antimony (Sb), bismuth (Bi), lead, or tellurium] to stabilize high-index facets. Both simulation and experiment confirmed that this method stabilized the {210} planes. A study of the PtSb system showed that the tetrahexahedron shape resulted from the evaporative removal of Sb from the initial alloy—a shape-regulating process fundamentally different from solution-phase, ligand-dependent processes. The current density at a fixed potential for the electro-oxidation of formic acid with a commercial Pt/carbon catalyst increased by a factor of 20 after transformation with Bi into tetrahexahedral particles.

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