Morphology of size-selected Ptn clusters on CeO2(111).
Morphology of size-selected Ptn clusters on CeO2(111).
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DOI：
10.1063/1.5017906
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
S. Shahed;Atsushi Beniya;H. Hirata;Y. Watanabe
中科院分区：
文献类型：
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作者：
S. Shahed;Atsushi Beniya;H. Hirata;Y. Watanabe
负载型铂催化剂和二氧化铈因其在汽车尾气催化剂中的应用而广为人知。在CeO2(111)表面负载的大小选择的铂团簇显示出不同的物理和化学性质。我们用扫描隧道显微镜在室温下研究了尺寸选择的PtN(n=5-13)团簇在CeO2(111)表面的形貌。当n=5时，PtN团簇倾向于二维形态，当n≥=6时，倾向于三维(3D)形态。当n≥10时，我们进一步观察到3D三层结构的偏好。对于每种团簇尺寸，我们定量地估计了每种形态下团簇的相对比例。PtN团簇在CeO2(111)表面上的形貌与尺寸有关，这归因于团簇中的铂-铂相互作用以及团簇与CeO2(111)表面之间的铂-氧相互作用。本文的结果提供了对CeO2(111)表面上PtN团簇的尺寸依赖的形态的清楚的理解。
Supported Pt catalysts and ceria are well known for their application in automotive exhaust catalysts. Size-selected Pt clusters supported on a CeO2(111) surface exhibit distinct physical and chemical properties. We investigated the morphology of the size-selected Ptn (n = 5-13) clusters on a CeO2(111) surface using scanning tunneling microscopy at room temperature. Ptn clusters prefer a two-dimensional morphology for n = 5 and a three-dimensional (3D) morphology for n ≥ 6. We further observed the preference for a 3D tri-layer structure when n ≥ 10. For each cluster size, we quantitatively estimated the relative fraction of the clusters for each type of morphology. Size-dependent morphology of the Ptn clusters on the CeO2(111) surface was attributed to the Pt-Pt interaction in the cluster and the Pt-O interaction between the cluster and CeO2(111) surface. The results obtained herein provide a clear understanding of the size-dependent morphology of the Ptn clusters on a CeO2(111) surface.