Enhancing catalytic properties of ligand-protected gold-based 25-metal atom nanoclusters by silver doping
Herein, engineering metal composition of metal nanoclusters (NCs) by foreign metal doping was used as an approach to synthesize gold (Au)-based 25-metal NC catalysts, without compromising the presence of their ligands and unique structure of 25 metal atoms. The Au-based 25-metal atom NCs with silver...
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| Main Authors: | , , |
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| 格式: | Article |
| 语言: | English English |
| 出版: |
Elsevier
2022
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| 在线阅读: | http://irep.iium.edu.my/96763/7/96763_Enhancing%20catalytic%20properties%20of%20ligand-protected%20gold-based_SCOPUS.pdf http://irep.iium.edu.my/96763/8/96763_Enhancing%20catalytic%20properties%20of%20ligand-protected%20gold-based%20%282%29.pdf http://irep.iium.edu.my/96763/ https://www.sciencedirect.com/science/article/abs/pii/S2468823121007112?via%3Dihub https://doi.org/10.1016/j.mcat.2021.112095 |
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| 总结: | Herein, engineering metal composition of metal nanoclusters (NCs) by foreign metal doping was used as an approach to synthesize gold (Au)-based 25-metal NC catalysts, without compromising the presence of their ligands and unique structure of 25 metal atoms. The Au-based 25-metal atom NCs with silver doping which can also be called as bimetallic AuAg NCs (i.e., Au25-xAgx(SR)18 NCs with x = 4–12) were successfully synthesized by co-reduction method with various feeding ratios (RAu/Ag = 24/1, 22/3 and 18/7). The Ag dopants favorably replaced Au(0) atom on the vertex of the icosahedral core and enhanced the catalytic activity of bimetallic Au25-xAgx(SR)18 NCs due to combination of several factors. As compared to monometallic Au25(SR)18 NCs, Au25-xAgx(SR)18 NCs have (1) synergistic effects of Au and Ag atoms; (2) better ligands removal's and active sites exposure due to weaker Ag-SR bond than Au-SR bond based on DFT analysis; (3) weaker Ag-H than Au-H bond based on DFT analysis; and (4) better stability as smaller metal NCs during the catalytic reaction. The study reveals a wider opportunity to tailor the catalytic properties of atomically precise Au-based 25-metal atom NC by engineering its metal composition. |
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