Magic-number gold nanoclusters with diameters from 1 to 3.5 nm: Relative stability and catalytic activity for CO oxidation

Hui Li, Lei Li, Andreas Pedersen, Yi Gao, Navneet Khetrapal, Hannes Jónsson, Xiao Cheng Zeng

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Relative stability of geometric magic-number gold nanoclusters with high point-group symmetry (Ih, D5h, Oh) and size up to 3.5 nm, as well as structures obtained by global optimization using an empirical potential, is investigated using density functional theory (DFT) calculations. Among high-symmetry nanoclusters, our calculations suggest that from Au(147) to Au(923), the stability follows the order Ih > D5h > Oh. However, at the largest size of Au(923), the computed cohesive energy differences among high-symmetry Ih, D5h and Oh isomers are less than 4 meV/atom (at PBE level of theory), suggesting the larger high-symmetry clusters are similar in stability. This conclusion supports a recent experimental demonstration of controlling morphologies of high-symmetry Au(923) clusters (Plant, S. R.; Cao, L.; Palmer, R. E. J. Am. Chem. Soc. 2014, 136, 7559). Moreover, at and beyond the size of Au(549), the face-centered cubic-(FCC)-based structure appears to be slightly more stable than the Ih structure with comparable size, consistent with experimental observations. Also, for the Au clusters with the size below or near Au(561), reconstructed icosahedral and decahedral clusters with lower symmetry are slightly more stable than the corresponding high-symmetry isomers. Catalytic activities of both high-symmetry and reconstructed Ih-Au(147) and both Ih-Au(309) clusters are examined. CO adsorption on Au(309) exhibits less sensitivity on the edge and vertex sites compared to Au(147), whereas the CO/O2 coadsorption is still energetically favorable on both gold nanoclusters. Computed activation barriers for CO oxidation are typically around 0.2 eV, suggesting that the gold nanoclusters of 2nm in size are highly effective catalysts for CO oxidation.

Original languageEnglish (US)
Pages (from-to)682-688
Number of pages7
JournalNano Letters
Volume15
Issue number1
DOIs
StatePublished - Jan 14 2015

Keywords

  • CO oxidation
  • gold nanoclusters
  • magic number
  • relative stability
  • surface reconstruction

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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