Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation

Jiaxin Liu, Botao Qiao, Yian Song, Hailian Tang, Yudong Huang, Jingyue Liu

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Gold was supported on commercial ZnO powders (P) and homemade ZnO nanowires (NWs) by a modified deposition-precipitation method. X-ray diffraction and transmission electron microscopy investigation indicated that the size of the Au nanoparticles (NPs) depended strongly on the calcination temperature. The Au NPs were highly dispersed (400°C. Such unique anchoring mechanism accounts for the much better experimentally observed sintering resistance. X-ray photoelectron spectra showed that Au existed as both metallic Au0 and Auδ+ species in all the synthesized catalysts with or without calcination treatment; the ratios of Auδ+/Au0, however, varied, depending on the treatment conditions. Catalytic tests showed that the activity for CO oxidation strongly depended on the size of the Au NPs. After calcination at 600°C, the specific rate for CO oxidation at room temperature decreased about 30 times on Au/ZnO P but only about 4 times on Au/ZnO NW. Stability tests demonstrated that the Au/ZnO NW catalysts had better stability for CO oxidation.

Original languageEnglish (US)
JournalJournal of Energy Chemistry
DOIs
StateAccepted/In press - Dec 18 2015

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Keywords

  • CO oxidation
  • Epitaxy
  • Gold
  • Nanowires
  • Sintering
  • Stability
  • ZnO

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Fuel Technology
  • Electrochemistry

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