Crystal structure engineering in multimetallic high-index facet nanocatalysts

Bo Shen, Liliang Huang, Jiahong Shen, Kun He, Cindy Y. Zheng, Vinayak P. Dravid, Chris Wolverton*, Chad A. Mirkin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In the context of metal particle catalysts, composition, shape, exposed facets, crystal structure, and atom distribution dictate activity. While techniques have been developed to control each of these parameters, there is no general method that allows one to optimize all parameters in the context of polyelemental systems. Herein, by combining a solid-state, Bi-influenced, high-index facet shape regulation strategy with thermal annealing, we achieve control over crystal structure and atom distribution on the exposed high-index facets, resulting in an unprecedentedly diverse library of chemically disordered and ordered multimetallic (Pt, Co, Ni, Cu, Fe, and Mn) tetrahexahedral (THH) nanoparticles. Density functional theory calculations show that surface Bi modification stabilizes the {210} high-index facets of the nanoparticles, regardless of their internal atomic ordering. Moreover, we find that the ordering transition temperatures for the nanoparticles are dependent on their composition, and, in the case of Pt3Fe1 THH nanoparticles, increasing Ni substitution leads to an order-to-disorder transition at 900 °C. Finally, we have discovered that ordered intermetallic THH Pt1Co1 nanocatalysts exhibit a catalytic performance superior to disordered THH Pt1Co1 nanoparticles and commercial Pt/C catalysts toward methanol electrooxidation, highlighting the importance of crystal structure and atom distribution control on high-index facets in nanoscale catalysts.

Original languageEnglish (US)
Article number722118
JournalProceedings of the National Academy of Sciences of the United States of America
Volume118
Issue number26
DOIs
StatePublished - Jun 29 2021

Keywords

  • Crystal structure control
  • High-index facet nanoparticles
  • Intermetallics
  • Multimetallic catalysts
  • Surface modifications

ASJC Scopus subject areas

  • General

Fingerprint

Dive into the research topics of 'Crystal structure engineering in multimetallic high-index facet nanocatalysts'. Together they form a unique fingerprint.

Cite this