Interaction of CO and deuterium with bimetallic, monolayer Pt-island/film covered Ru(0001) surfaces.
Interaction of CO and deuterium with bimetallic, monolayer Pt-island/film covered Ru(0001) surfaces.
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CO 和氘与双金属、单层 Pt 岛/薄膜覆盖的 Ru(0001) 表面的相互作用。
DOI：
10.1039/c2cp41434a
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
R. Behm
中科院分区：
文献类型：
--
作者：
H. Hartmann;T. Diemant;J. Bansmann;R. Behm
用程序升温脱附(TPD)法，以CO和氘为探针分子，研究了由部分或全部被单层铂岛覆盖的Ru(0001)衬底或单层铂膜构成的结构良好的双金属铂/Ru(0001)表面的吸附性能。此外，还用红外反射吸收光谱(IRAS)研究了CO的吸附。假象铂岛或单层膜的存在导致了两种吸附材料的吸附性能的显著改变，无论是在被覆盖的铂上，还是在表面的裸露的Ru部分上都是如此。除了吸附在单层铂岛上的明显的弱结合吸附物种外，我们还发现了岛屿边缘脱附的独特贡献，脱附过程中的溢出过程，以及与脱附相关的峰随着铂覆盖率的增加而从无铂的Ru(0001)区域下移。这些效应被我们认为是双金属表面吸附的特征，我们详细地讨论了它们在具有各自类型的大的连续区域的双金属表面上的吸附。
The adsorption properties of structurally well defined bimetallic Pt/Ru(0001) surfaces, consisting of a Ru(0001) substrate partly or fully covered by monolayer Pt islands or a monolayer Pt film, were studied by temperature programmed desorption (TPD) using CO and deuterium as probe molecules. Additionally, the adsorption of CO was investigated by infrared reflection absorption spectroscopy (IRAS). The presence of the pseudomorphic platinum islands or monolayer film leads to considerable modifications of the adsorption properties for both adsorbates, both on the Pt covered and, to a smaller extent, on the bare Ru part of the surfaces. In addition to distinct weakly bound adspecies, which are adsorbed on the monolayer Pt islands, we find unique contributions from island edge desorption, from spill-over processes during the desorption run, and a general down-shift of the peak related to desorption from Pt-free Ru(0001) areas with increasing Pt coverage. These effects, which we consider as characteristic for adsorption on bimetallic surfaces with large contiguous areas of the respective types, are discussed in detail.