Stable Pt Single Atoms and Nanoclusters on Ultrathin CuO Film and Their Performances in CO Oxidation

Stable Pt Single Atoms and Nanoclusters on Ultrathin CuO Film and Their Performances in CO Oxidation
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超薄 CuO 薄膜上稳定的 Pt 单原子和纳米团簇及其 CO 氧化性能

DOI:
10.1021/acs.jpcc.5b11362
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发表时间:
2016-01
影响因子:
3.7
通讯作者:
Kai Wu
Kai Wu
中科院分区:
化学3区
文献类型:
--
作者:
Wei Chen;Guoqin Xu;Xueming Yang;Kai Wu

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成功制备了一系列由Cu(110)表面生长的单层CuO膜负载的Pt单原子和纳米团簇组成的模型催化剂,该催化剂在室温以上具有良好的稳定性,并在低至360 K的温度下表现出良好的CO氧化性能。结合扫描隧道显微镜和程序升温脱附测量直接证明,在最初的CO氧化阶段,在CuO晶格中的氧空位产生在最近的邻居的Pt纳米团簇。实验结果表明,Pt纳米团簇的氧化活性与团簇尺寸成反比.相比之下,Pt单原子具有没有表面活性的CO氧化,因为早期和完全脱附的CO之前,其在模型催化剂上的氧化开始。
A series of model catalysts consisting of Pt single atoms and nanoclusters supported by monolayered CuO film grown at Cu(110) were successfully prepared, which could be stabilized well above room temperature and which exhibited a high performance in CO oxidation at temperatures as low as ∼360 K. Combined scanning tunneling microscopy and temperature-programmed desorption measurements directly evidenced that at the initial CO oxidation stage, oxygen vacancy in the CuO lattice was generated at the nearest neighbor of the Pt nanoclusters. The experimental measurements showed that the oxidation activity was inversely proportional to the Pt nanocluster size. In contrast, the Pt single atoms possessed no surface reactivity for the CO oxidation because of the early and complete desorption of CO before its oxidation on the model catalysts commenced.
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