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High-Resolution Scanning Tunneling Microscopy Studies of Surface Reactions on Rutile TiO2(110)

机译:高分辨率扫描隧道显微镜润帘TiO2表面反应的显微镜研究(110)

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Transition-metal oxide surfaces play an important role in a wide range of applications such as heterogeneous catalysis, photocatalysis and photo-electrolysis. In this talk recent studies on a prototypical model oxide system, the rutile TiO2(110) surface, will be presented. We will address clear-cut identification of surface defects such as oxygen vacancies, hydroxyl groups, and near-surface defect such as interstitials. We find that water molecules dissociate both in O-vacancies at subsurface interstitial sites. We show that at temperatures between ~150 K and ~210 K water monomers diffusing along the Ti troughs form stable dimers that diffuse faster than the water monomers. An H-bond-mediated roll-over mechanism operating for the water dimers explains the faster diffusion of the water dimer compared to the diffusion of water monomers.
机译:过渡金属氧化物表面在多种应用中起重要作用,例如异质催化,光催化和光电解。在该谈判最近关于氧化模型氧化物系统的研究,将呈现金红石TiO2(110)表面。我们将解决清除鉴定的表面缺陷,如氧空缺,羟基和近表面缺陷,如间质。我们发现水分子在地下间隙位点的O-uscancies中解散。我们表明,在沿Ti槽的径向〜150k和〜210k水单体之间的温度形成稳定的二聚体,其比水单体更快地弥漫。对于水二聚体操作的H键介导的滚动机构解释了与水单体的扩散相比的水二聚体的更快扩散。

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