Size-Dependent Restructuring of Supported Platinum Cluster Catalysts
1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China.
Journal of the American Chemical Society
|September 5, 2025
Summary
We developed a method to control platinum cluster size on ceria nanoislands. Smaller clusters fragment under reaction conditions, while 1.5 nm clusters show optimal catalytic activity for CO oxidation.
Area of Science:
- Materials Science
- Catalysis
- Surface Science
Background:
- Supported metal clusters exhibit reactivity influenced by nuclearity and structure.
- Controlling cluster size is crucial for optimizing catalytic performance.
Purpose of the Study:
- To develop a strategy for precise control over platinum cluster nuclearity.
- To investigate the size-dependent restructuring behavior and catalytic properties of platinum clusters.
Main Methods:
- Utilizing isolated cerium oxide (CeOx) nanoislands on SiO2 to confine platinum clusters.
- Manipulating platinum cluster migration and growth using H2 and CO atmospheres.
- Evaluating catalytic activity and deactivation mechanisms during CO oxidation.
Main Results:
- Platinum cluster nuclearity can be precisely controlled on CeOx nanoislands.
- 0.7 nm platinum clusters deactivate via oxidative fragmentation into single atoms.
- 1.5 nm platinum clusters exhibit higher catalytic activity and stability compared to 0.7 nm and 2.2 nm clusters during CO oxidation.
Conclusions:
- Platinum cluster restructuring is a dynamic process influenced by reaction conditions.
- Optimized supported metal cluster catalysts can be constructed by controlling size and stabilizing against restructuring.
- This work provides insights into designing robust and efficient supported metal cluster catalysts.
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