期刊
DIAMOND AND RELATED MATERIALS
卷 120, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108690
关键词
High resolutions electron microscopy; Thermal stability; Nanostructures; Amorphous carbon; Nanoparticles
类别
资金
- Hong Kong Branch of South Marine Science and Engineering Guangdong Laboratory [SMSEGL20SC01]
- Research Grants Council of Hong Kong [16306818]
- RGC-NSFC [N_HKUST624/19]
- National Key R&D Program of China [2016YFA0204100]
- National Natural Science Foundation of China [91845201, 21961160722, 22072162]
- Liaoning Revitalization Talents Program [XLYC1907055]
- Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology [191005-K]
- Sinopec China
The study revealed that surface flatness of graphene-based supports plays a crucial role in the thermal stability of metal nanocatalysts, and microstructural transformations can affect the coarsening process of PtNPs.
The real-time investigations of coarsening process and microstructural transformation are instrumental in elucidating the thermal stability, ripening dynamics and coalescing microstructures of metal nanocatalysts in thermocatalytic reactions. Herein, we conducted an in-situ transmission electron microscopy (TEM) study on reduced graphene oxide-based platinum nanocatalysts (Pt/rGO). The platinum nanoparticles (PtNPs) exhibited superior thermal stability on the rGO flat surface than on the wrinkle one, indicating that improving the surface flatness of graphene-based supports can increase the thermal stability of deposited metal nanocatalysts. The timeresolved analysis demonstrated that the thermal-induced microstructural transformation (graphitization) of the rGO support caused the discrepancy of PtNPs coarsening from the Ostwald ripening model. The in-situ highresolution images further revealed the coalescing microstructures of PtNPs on the graphitized rGO, which validated the previous simulation research by real-time experimental observations.
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