Intracluster Atomic and Electronic Structural Heterogeneities in Supported Nanoscale Metal Catalysts
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- 作者：Annika Elsen ; Ulrich Jung ; Fernando Vila ; Yuanyuan Li ; Olga V. Safonova ; Rowena Thomas ; Moniek Tromp ; John J. Rehr ; Ralph G. Nuzzo ; Anatoly I. Frenkel
- 刊名：Journal of Physical Chemistry C
- 出版年：2015
- 出版时间：November 12, 2015
- 年：2015
- 卷：119
- 期：45
- 页码：25615-25627
- 全文大小：625K
- ISSN：1932-7455
文摘
This work reveals and quantifies the inherent intracluster heterogeneity in the atomic structure and charge distribution present in supported metal catalysts. The results demonstrate that these distributions are pronounced and strongly coupled to both structural and dynamic perturbations. They also serve to clarify the nature of the dynamic bonding of nanoscale catalytic metal clusters with their supports, and the mediation of these properties due to the presence of adsorbates. These findings are supported by theoretical modeling and experimental data measured for an exemplary supported metal catalyst, Pt supported on silica, using in situ high energy resolution X-ray absorption and emission spectroscopies; in situ diffuse reflectance infrared Fourier transform spectroscopy; and ex situ scanning transmission electron microscopy.