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Aggregation of CeO2 particles with aligned grains drives sintering of Pt single atoms in Pt/CeO2 catalysts

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Title
Aggregation of CeO2 particles with aligned grains drives sintering of Pt single atoms in Pt/CeO2 catalysts
Author(s)
Lee, Jaeha; Sungsu Kang; Lee, Eunwon; Minho Kang; Jongbaek Sung; Kim, Tae Jin; Christopher, Phillip; Jungwon Park; Kim, Do Heui
Publication Date
2022-03
Journal
JOURNAL OF MATERIALS CHEMISTRY A, v.10, no.13, pp.7029 - 7035
Publisher
ROYAL SOC CHEMISTRY
Abstract
Understanding the sintering mechanism of platinum-group-metals (PGMs) supported on reducible oxides, such as CeO2, is of fundamental and practical importance for the development of durable catalysts. It has been reported that the sintering of PGM nanoparticles occurs simultaneously with the aggregation of CeO2 nanostructures during high temperature thermal treatment. However, mechanistic insights into the coupled sintering processes are insufficient, due to the lack of direct in situ observations of the atomic scale reconstruction processes. Here, we utilize in situ and ex situ transmission electron microscopy measurements to examine the processes of Pt and CeO2 sintering in model catalytic materials consisting of Pt on isolated CeO2 particles and Pt on aggregated CeO2 particles with varying grain boundary alignment. CeO2 particle aggregation is observed to occur most facilely at particle contacts with well aligned grain boundaries and in turn these contacts serve as locations of the most significant Pt sintering. Our results suggest that the surface reconstruction during CeO2 aggregation provides the driving force for Pt sintering and provides new understanding of the sintering mechanism of PGM catalysts.
URI
https://pr.ibs.re.kr/handle/8788114/11988
DOI
10.1039/d1ta10433k
ISSN
2050-7488
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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