Ultrastable single-atom gold catalysts with strong covalent metal-support interaction (CMSI)

Botao Qiao, Jin Xia Liang, Aiqin Wang, Cong Qiao Xu, Jun Li, Tao Zhang, Jingyue Liu

Research output: Contribution to journalArticle

166 Scopus citations

Abstract

Supported noble metal nanoparticles (including nanoclusters) are widely used in many industrial catalytic processes. While the finely dispersed nanostructures are highly active, they are usually thermodynamically unstable and tend to aggregate or sinter at elevated temperatures. This scenario is particularly true for supported nanogold catalysts because the gold nanostructures are easily sintered at high temperatures, under reaction conditions, or even during storage at ambient temperature. Here, we demonstrate that isolated Au single atoms dispersed on iron oxide nanocrystallites (Au1/FeOx) are much more sinteringresistant than Au nanostructures, and exhibit extremely high reaction stability for CO oxidation in a wide temperature range. Theoretical studies revealed that the positively charged and surface-anchored Au1 atoms with high valent states formed significant covalent metal-support interactions (CMSIs), thus providing the ultra-stability and remarkable catalytic performance. This work may provide insights and a new avenue for fabricating supported Au catalysts with ultra-high stability. [Figure not available: see fulltext.]

Original languageEnglish (US)
Pages (from-to)2913-2924
Number of pages12
JournalNano Research
Volume8
Issue number9
DOIs
StatePublished - Sep 15 2015

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Keywords

  • CO oxidation
  • covalent metal-support interaction
  • gold catalyst
  • single-atom catalysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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