Surface-strain-enhanced oxygen dissociation on gold catalysts

The excellent low-temperature oxidation performance and stability of nanogold catalysts have attracted significant interest. However, the main active source of the low-temperature oxidation of gold remains to be determined. In situ electron microscopy and mass spectrometry results show that nitrogen...

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Bibliographic Details
Published in:RSC advances 2023-07, Vol.13 (33), p.2271-22716
Main Authors: Gao, Tianqi, Shen, Yongli, Gu, Lin, Zhang, Zhaocheng, Yuan, Wenjuan, Xi, Wei
Format: Article
Language:English
Subjects:
Catalysts
Chemistry
First principles
Gold
Low temperature
Mass spectrometry
Nitrogen
Oxidation
Oxygen atoms
Strain analysis
Tensile strain
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Summary:The excellent low-temperature oxidation performance and stability of nanogold catalysts have attracted significant interest. However, the main active source of the low-temperature oxidation of gold remains to be determined. In situ electron microscopy and mass spectrometry results show that nitrogen is oxidized, and the catalyst surface undergoes reconstruction during the process. Strain analysis of the catalyst surface and first-principles calculations show that the tensile strain of the catalyst surface affects the oxidation performance of gold catalysts by enhancing the adsorption ability and dissociation of O 2 . The newly formed active oxygen atoms on the gold surface act as active sites in the nitrogen oxidation reaction, significantly enhancing the oxidation ability of gold catalysts. This study provides evidence for the dissociation mechanism of oxygen on the gold surface and new design concepts for improving the oxidation activity of gold catalysts and nitrogen activation. The tensile strain on the gold surface enhanced oxidation activity by inducing the formation of active oxygen atoms.
ISSN:2046-2069
2046-2069
DOI:10.1039/d3ra03781a