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Growth and Structure of Ni–Au Bimetallic Particles on Reducible CeO2(111)

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Abstract

The growth and sintering behavior of Ni–Au have been investigated on CeOx(111) (1.5 < x < 2) thin films with controlled oxidation states under ultrahigh vacuum conditions. Scanning tunneling microscopy studies reveal that pure Au grows three-dimensional particles with a submonolayer coverage at room temperature, while Ni prefers two-dimensional islands on ceria as a result of a stronger metal–ceria interaction. With heating, Au experiences extensive particle growth compared to Ni. In the study, bimetallic Ni–Au particles were prepared by deposition of 0.3 ML Ni followed by 0.3 ML Au on ceria. A larger fraction of deposited Au on the Ni particles dispersed on ceria. A small percent of Au was observed to form new pure Au particles on both ceria surfaces. With heating, both Au and Ni–Au particles sinter on CeO1.8 resulting in a bimodal particle size distribution. However, mostly Ni–Au bimetallic particles are present on CeO2. The different sintering behavior is attributed to the surface defects present on the reduced ceria. Such behavior was also observed in the study of ceria-supported Pt–Au bimetallic particles. Our study demonstrates that bimetallic Ni–Au particles can be prepared by deposition of Au on the existing Ni particles as “seeds” on both oxidized and partially reduced ceria. The growth and sintering behavior of Ni–Au bimetallic surfaces are dependent on the nature of ceria supports. Our study can provide morphological and size information for the understanding of the activity of ceria-supported Ni–Au catalysts.

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Acknowledgments

The research is sponsored by University of Wyoming start-up funds and National Science Foundation (Grant No: CHE1151846). In addition, Yinghui Zhou wants to acknowledge the support from Natural Science Foundation of Fujian Province of China (No. 2014J05011).

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Authors and Affiliations

  1. Department of Chemistry, University of Wyoming, Laramie, WY, 82071, USA

    Yinghui Zhou, Erik Wayne Peterson & Jing Zhou

  2. Department of Physics, Xiamen University, Xiamen, 361005, People’s Republic of China

    Yinghui Zhou

Authors
  1. Yinghui Zhou
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  2. Erik Wayne Peterson
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  3. Jing Zhou
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Correspondence to Jing Zhou.

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Zhou, Y., Peterson, E.W. & Zhou, J. Growth and Structure of Ni–Au Bimetallic Particles on Reducible CeO2(111). Top Catal 58, 134–142 (2015). https://doi.org/10.1007/s11244-014-0352-y

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  • DOI: https://doi.org/10.1007/s11244-014-0352-y

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