期刊
ACS NANO
卷 11, 期 2, 页码 1649-1658出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b07409
关键词
Au-Pd nanoalloy; TiO2; ab initio molecular dynamics; redox property; charge transfer
类别
资金
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, Biosciences
- NSFC [21521091]
- NKBRSF of China [2013CB834603]
- Department of Energy's Office of Biological and Environmental Research at Pacific Northwest National Laboratory
- PNNL Institutional Computing (PIC) program at Pacific Northwest National Laboratory
The structure, composition, and atomic distribution of nanoalloys under operating conditions are of significant importance for their catalytic activity. In the present work, we use ab initio molecular dynamics simulations to understand the structural behavior of Au-Pd nanoalloys supported on rutile TiO2 under different conditions. We find that the Au-Pd structure is strongly dependent on the redox properties of the support, originating from strong metal support interactions. Under reducing conditions, Pd atoms are inclined to move toward the metal/oxide interface, as indicated by a significant increase of Pd-Ti bonds. This could be attributed to the charge localization at the interface that leads to Coulomb attractions to positively charged Pd atoms. In contrast, under oxidizing conditions, Pd atoms would rather stay inside or on the exterior of the nanoparticle. Moreover, Pd atoms on the alloy surface can be stabilized by hydrogen adsorption, forming Pd-H bonds, which are stronger than Au-H bonds. Our work offers critical insights into the structure and redox properties of Au-Pd nanoalloy catalysts under working conditions.
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