Defect-Mediated Gold Substitution Doping in ZnO Mesocrystals and Catalysis in CO Oxidation

Ming Han Liu, Yun Wen Chen, Xiaoyan Liu, Jer Lai Kuo, Ming Wen Chu, Chung Yuan Mou

研究成果: 雜誌貢獻文章同行評審

47 引文 斯高帕斯(Scopus)

摘要

Highly dispersed supported gold with strong metal-support interaction is a desirable material for heterogeneous catalysis. Unlike current dispersion strategies of depositing gold from solution to support, we report herein a new method of producing highly dispersed gold clusters on ZnO mesocrystal. The gold clusters appeared on defect-rich twin-brush ZnO mesocrystals (TB-ZnO) via an in-and-out process: (i) a mixed Au/Zn oxide was formed first after deposition-precipitation of Au with AuCl4-, (ii) fine Au clusters grow from the underneath to the surface of the oxide after heating. The TB-ZnO behaved like a sponge allowing gold atoms to heavily disperse into the wurtzite structure of ZnO with Zn-substitution by gold. After mild thermal treatment, the embedded gold emerged from underneath of the ZnO support to form highly dispersed Au nanoparticles of ∼2 nm on the ZnO surface. DFT calculation shows energetically favored Au-doping in TB-ZnO and facile defect-mediated migration of Au in it. The material (Au/TB-ZnO) gave outstanding activities for the catalysis of CO oxidation. The use of mesocrystals of metal oxide as supports, with rich vacancy defects, provides a new route for preparing highly dispersed and active supported metal catalysts.

原文英語
頁(從 - 到)115-122
頁數8
期刊ACS Catalysis
6
發行號1
DOIs
出版狀態已發佈 - 1月 4 2016
對外發佈

ASJC Scopus subject areas

  • 催化
  • 化學 (全部)

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