Citation: Wang Wei-Jia, Wang Yan, Xu Qian, Ju Huan-Xin, Wang Tao, Tao Zhi-Jie, Hu Shan-Wei, Zhu Jun-Fa. Interaction of cobalt with ceria thin films and its influence on supported Au nanoparticles[J]. Chinese Chemical Letters, ;2017, 28(8): 1760-1766. doi: 10.1016/j.cclet.2017.04.012 shu

Interaction of cobalt with ceria thin films and its influence on supported Au nanoparticles

National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230029, China

Corresponding author: Zhu Jun-Fa, jfzhu@ustc.edu.cn; junfa_zhu@yahoo.com
Received Date: 30 January 2017
Revised Date: 14 March 2017
Accepted Date: 31 March 2017
Available Online: 17 August 2017

Figures(5)

The interaction of Co with ceria thin films and its influence on the sintering behavior of Au were investigated by scanning tunneling microscopy (STM), synchrotron radiation photoemission spectroscopy (SRPES) and X-ray photoelectron spectroscopy (XPS). The strong interaction between Co and CeO₂(111) leads to oxidation of Co to Co²⁺ at 300 K, accompanied by partial reduction of ceria surface at low Co coverages. Subsequent Co deposition results in an increasing fraction of metallic Co. Annealing to high temperatures induces Co²⁺ ions diffuse into the CeO₂ film, while the small metallic Co islands agglomerate into larger ones. The bimetallic Co-Au particles were prepared by deposition of Au on the existing Co particles on ceria surfaces. The sintering behavior of Co-Au bimetallic surfaces is found to be highly determined by the stoichiometry of ceria supports. The addition of Co to the Au/CeO₂ surface suppresses the sintering of Au particles at high temperatures in comparison with that of pure Au particles. However, Au particles are less stable on the Co/CeO_1.82 layer than on CeO_1.82 surface.
- Cobalt,
- Gold,
- Ceria,
- SRPES,
- XPS,
- STM
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