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 journalArticlepeer-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 languageEnglish (US)
Pages (from-to)1159-1163
Number of pages5
JournalScience
Volume365
Issue number6458
DOIs
StatePublished - Sep 13 2019

ASJC Scopus subject areas

  • General

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