Vibrational spectroscopic studies on pure and metal‐covered metal oxide surfaces
Vibrational spectroscopic studies on pure and metal‐covered metal oxide surfaces
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DOI：
10.1002/pssb.201248534
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
H. Noei;Lanying Jin;H. Qiu;Mingchun Xu;Youkun Gao;Jianli Zhao;Max Kauer;C. Wöll;M. Muhler
中科院分区：
文献类型：
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作者：
H. Noei;Lanying Jin;H. Qiu;Mingchun Xu;Youkun Gao;Jianli Zhao;Max Kauer;C. Wöll;M. Muhler
金属氧化物和分散在氧化物衬底上的金属纳米颗粒由于其广泛的应用，特别是在多相催化方面的应用，在表面科学中引起了越来越多的兴趣。在这篇综述中，我们总结了我们最近在纯和金属覆盖的氧化物表面（ZnO, TiO2， Au/ZnO和Cu/ZnO）上的振动光谱研究，使用了许多小分子（H2， CO, CO2， NO和HCOOH）作为探针和/或反应物。高分辨率电子能量损失光谱（HREELS）被证明是研究明确定义的氧化物和金属/氧化物模型系统的有力工具。应用一种新型的超高真空红外光谱（UHV - FTIRS）设备，我们可以记录单晶和多晶粉末颗粒氧化物表面的高质量红外数据。我们将特别关注以下重要问题：(i)氢与ZnO的相互作用；（ii）极性和非极性氧化锌表面的结构和反应性；（iii）缺陷在氧化物表面化学中的作用；（iv）锐钛矿与金红石型TiO2光催化活性显著差异的原因；(v)金属纳米颗粒与氧化物载体之间的相互作用。我们将证明来自HREELS和UHV - FTIRS的数据提供了对所研究系统的结构，电子和化学性质的详细见解。
Metal oxides and metal nanoparticles dispersed on oxide substrates have gained increasing interest in surface science because of their widespread applications, especially in heterogeneous catalysis. In this review we summarize our recent vibrational spectroscopic studies on pure and metal‐covered oxide surfaces (ZnO, TiO2, Au/ZnO and Cu/ZnO) using a number of small molecules (H2, CO, CO2, NO and HCOOH) as probes and/or reactants. High‐resolution electron energy loss spectroscopy (HREELS) turned out to be a powerful tool to investigate well‐defined oxide and metal/oxide model systems. The application of a novel ultrahigh vacuum IR spectroscopy (UHV‐FTIRS) apparatus allowed us to record high‐quality IR data on oxide surfaces of both single crystals and polycrystalline powder particles. We will particularly focus on following important issues: (i) the interaction of hydrogen with ZnO; (ii) structure and reactivity of polar and nonpolar ZnO surfaces; (iii) the role of defects in surface chemistry of oxides; (iv) the origin of significant difference in photocatalytic activity between anatase and rutile TiO2 and (v) the interaction between metal nanoparticles and oxide supports. We will demonstrate that the data from HREELS and UHV‐FTIRS provide detailed insight into structural, electronic and chemical properties of the studied systems.