Catalytic activities of sonochemically prepared Au-core/Pd-shell-structured bimetallic nanoparticles immobilised on TiO2 and its dependence on Pd-shell thickness

Yoshiteru Mizukoshi, Kazuhisa Sato, Junichiro Kugai, Takao A. Yamamoto, Toyohiko J. Konno, Naoya Masahashi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Catalytic activities of sonochemically prepared Au-core/Pd-shell-structured bimetallic nanoparticles (NPs) immobilised on TiO2 were evaluated. Comparing with the mixture of monometallic Au and Pd NPs on TiO2, core/shell-immobilised catalysts exhibited higher activities for the partial reduction of nitrobenzene (NB) to aniline (AN), suggesting that the synergistic effect originating from the core/shell structure enhanced the catalytic activities. In the case of high Au/Pd ratios, where the Pd-shell thickness was calculated to be 0.5 nm or lower, infrared spectroscopic measurements of adsorbed CO showed that the Au cores were successfully covered with Pd shells. It was found that a thin Pd shell of one layer or two layers of Pd atoms effectively catalysed the reduction of NB under ambient temperature, whereas the formation of AN was not confirmed on monometallic Au NP-immobilised catalysts.

Original languageEnglish
Pages (from-to)235-247
Number of pages13
JournalJournal of Experimental Nanoscience
Volume10
Issue number3
DOIs
Publication statusPublished - 2015 Feb 15

Keywords

  • bimetallic nanoparticles
  • core/shell structure
  • nanocatalysts
  • sonochemical reduction
  • synergistic effect

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering
  • Materials Science(all)

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