Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (6): 921-927.doi: 10.1007/s40242-022-2267-7

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In situ Synthesis of Ultrasmall Au Clusters on Thiol-modified CeO2 with Enhanced Stability and CO Oxidation Activity

LI Lingling1,2, XU Jinhui1,2, LIANG Xi1,2, WU Xueting1,2, WANG Xiao1,2, SONG Shuyan1,2, and ZHANG Hongjie1,2,3   

  1. 1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P.R. China;
    2. School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, P.R. China;
    3. Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China
  • Received:2022-08-23 Online:2023-12-01 Published:2023-11-18
  • Contact: ZHANG Hongjie, SONG Shuyan, WANG Xiao E-mail:hongjie@ciac.ac.cn;songsy@ciac.ac.cn;wangxiao@ciac.ac.cn
  • Supported by:
    This work was supported by the National Science and Technology Major Project of China (No.2021YFB3500700), the National Natural Science Foundation of China (Nos.22020102003, 22025506), the Key Research Program of the Chinese Academy of Sciences (No.ZDRW-CN-2021-3-3), and the K. C. Wong Education Foundation, China (No.GJTD-2018-09).

Abstract: Gold (Au) nanoclusters supported on various supports have been widely used in the fields of energy and catalysis. However, the poor thermal stability of Au nanoclusters on the support interface usually leads to a reduction or even loss of catalytic activity. Herein, we used an in situ reduction method to synthesize Au nanoclusters on ceria (CeO2) carriers. In this method, sulfhydryl groups were used to modify CeO2 nanospheres first, and then Au clusters with an average diameter of 1.5 nm were grown on the surface of ceria reduced with sodium borohydride. The presence of the Au-S-Ce structure enhances the electron transfer efficiency, making the material exhibit high CO oxidation activity at room temperature. Furthermore, due to the strong binding energy of S and Au, the material exhibits a high stability for long time running process. This strategy provides an idea for designing stable and active supported ultrasmall Au nanoclusters catalytic materials.

Key words: Au cluster, Sulfhydryl, Oxygen activation, In situ synthesis