Strong metal-support interactions between gold nanoparticles and ZnO nanorods in CO oxidation

Xiaoyan Liu, Ming Han Liu, Yi Chia Luo, Chung Yuan Mou, Shawn D. Lin, Hongkui Cheng, Jin Ming Chen, Jyh Fu Lee, Tien Sung Lin

研究成果: 雜誌貢獻文章同行評審

410 引文 斯高帕斯(Scopus)

摘要

The catalytic performances of supported gold nanoparticles depend critically on the nature of support. Here, we report the first evidence of strong metal-support interactions (SMSI) between gold nanoparticles and ZnO nanorods based on results of structural and spectroscopic characterization. The catalyst shows encapsulation of gold nanoparticles by ZnO and the electron transfer between gold and the support. Detailed characterizations of the interaction between Au nanoparticles and ZnO were done with transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), electron paramagnetic resonance (EPR), and FTIR study of adsorbed CO. The significance of the SMSI effect is further investigated by probing the efficiency of CO oxidation over the Au/ZnO-nanorod. In contrast to the classical reductive SMSI in the TiO 2 supported group VIII metals which appears after high temperature reduction in H 2 with electron transfer from the support to metals, the oxidative SMSI in Au/ZnO-nanorod system gives oxygen-induced burial and electron transfer from gold to support. In CO oxidation, we found that the oxidative SMSI state is associated with positively charged gold nanoparticles with strong effect on its catalytic activity before and after encapsulation. The oxidative SMSI can be reversed by hydrogen treatment to induce AuZn alloy formation, de-encapsulation, and electron transfer from support to Au. Our discovery of the SMSI effects in Au/ZnO nanorods gives new understandings of the interaction between gold and support and provides new way to control the interaction between gold and the support as well as catalytic activity.

原文英語
頁(從 - 到)10251-10258
頁數8
期刊Journal of the American Chemical Society
134
發行號24
DOIs
出版狀態已發佈 - 6月 20 2012
對外發佈

ASJC Scopus subject areas

  • 催化
  • 化學 (全部)
  • 生物化學
  • 膠體和表面化學

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