Adhesion and Atomic Structures of Gold on Ceria Nanostructures: The Role of Surface Structure and Oxidation State of Ceria Supports

Yuyuan Lin, Zili Wu, Jianguo Wen, Kunlun Ding, Xiaoyun Yang, Kenneth R. Poeppelmeier, Laurence D. Marks

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

We report an aberration-corrected electron microscopy analysis of the adhesion and atomic structures of gold nanoparticle catalysts supported on ceria nanocubes and nanorods. Under oxidative conditions, the as-prepared gold nanoparticles on the ceria nanocubes have extended atom layers at the metal-support interface. In contrast, regular gold nanoparticles and rafts are present on the ceria nanorod supports. Under the reducing conditions of water-gas shift reaction, the extended gold atom layers and rafts vanish. In addition, the gold particles on the nanocubes change in morphology and increase in size while those on the nanorods are almost unchanged. The size, morphology, and atomic interface structures of gold strongly depend on the surface structures of ceria supports ((100) surface versus (111) surface) and the reaction environment (reductive versus oxidative). These findings provide insights into the deactivation mechanisms and the shape-dependent catalysis of oxide supported metal catalysts.

Original languageEnglish
Pages (from-to)5375-5381
Number of pages7
JournalNano letters
Volume15
Issue number8
DOIs
Publication statusPublished - Aug 12 2015

Keywords

  • Gold
  • aberration corrected STEM HAADF
  • adhesion
  • atomic structures
  • catalysis
  • ceria
  • nanocube
  • nanorods

ASJC Scopus subject areas

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

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