Probing Single‐Atom Catalysts and Catalytic Reaction Processes by Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy

Developing advanced characterization techniques for single‐atom catalysts (SACs) is of great significance to identify their structural and catalytic properties. Raman spectroscopy can provide molecular structure information, and thus, the technique is a promising tool for catalysis. However, its app...

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Bibliographic Details
Published in:Angewandte Chemie 2021-04, Vol.133 (17), p.9392-9396
Main Authors: Wei, Jie, Qin, Si‐Na, Yang, Ji, Ya, Han‐Long, Huang, Wei‐Hsiang, Zhang, Hua, Hwang, Bing Joe, Tian, Zhong‐Qun, Li, Jian‐Feng
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
catalytic hydrogenation
Chemistry
in situ spectroscopy
Interfaces
Liquid-solid interfaces
Molecular structure
Nanoparticles
Nitro compounds
Nucleation
Raman spectroscopy
Single atom catalysts
single atoms
Spectroscopy
Spectrum analysis
Structural analysis
surface-enhanced Raman spectroscopy
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Summary:Developing advanced characterization techniques for single‐atom catalysts (SACs) is of great significance to identify their structural and catalytic properties. Raman spectroscopy can provide molecular structure information, and thus, the technique is a promising tool for catalysis. However, its application in SACs remains a great challenge because of its low sensitivity. We develop a highly sensitive strategy that achieves the characterization of the structure of SACs and in situ monitoring of the catalytic reaction processes on them by shell‐isolated nanoparticle‐enhanced Raman spectroscopy (SHINERS) for the first time. Using the strategy, Pd SACs on different supports were identified by Raman spectroscopy and the nucleation process of Pd species from single atoms to nanoparticles was revealed. Moreover, the catalytic reaction processes of the hydrogenation of nitro compounds on Pd SACs were monitored in situ, and molecular insights were obtained to uncover the unique catalytic properties of SACs. This work provides a new spectroscopic tool for the in situ study of SACs, especially at solid–liquid interfaces. A highly sensitive Raman strategy has been developed to characterize the structure and surface species of single‐atom catalysts. Catalytic reaction processes on single‐atom catalysts were monitored in situ using shell‐isolated nanoparticle‐enhanced Raman spectroscopy.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202100198