Tailoring the Dispersion of Metals on ZnO with Preadsorbed Water
Tailoring the Dispersion of Metals on ZnO with Preadsorbed Water
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用预吸附水调整金属在 ZnO 上的分散
DOI：
10.1021/acs.jpclett.2c03031
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Xiang Shao
中科院分区：
文献类型：
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作者：
Yuniu Sun;Jiefu Zhang;D;an Zhou;Dan Wang;Qingqing Wang;Xiaolin Tan;Xiang Shao
金属颗粒在氧化物表面上的分散性对于金属/氧化物杂化系统的应用通常是至关重要的。在这项工作中，我们通过实验研究了预吸附水物种对沉积在 ZnO(10–10) 表面上的 Cu 和 Pd 颗粒的水合效应。使用扫描隧道显微镜（STM），我们清楚地看到Cu和Pd在干净的ZnO（10-10）表面上以三维颗粒的形式生长，但在水覆盖的表面上分散成单个原子和几个原子簇。此外，X射线光电子能谱（XPS）测量表明，Cu通过与分子水相互作用而容易被氧化，而Pd则倾向于结合表面羟基并保持中性状态。我们的工作证明了地表水在调整负载金属的形态和电子状态方面的有效作用，这可能为存在水的许多重要表面过程带来新的见解。
The dispersity of metal particles over oxide surfaces is generally critical for the applications of the metal/oxide hybridized systems. In this work, we have experimentally investigated the hydration effect of preadsorbed water species over the Cu and Pd particles deposited on the ZnO(10–10) surface. Using scanning tunneling microscopy (STM), we clearly saw that both Cu and Pd grow as three-dimensional particles on the clean ZnO(10–10) surface but disperse into single atoms and few-atom clusters on the water-covered surfaces. Moreover, X-ray photoelectron spectroscopy (XPS) measurements revealed that Cu is readily oxidized by interacting with the molecular water while Pd tends to bind the surface hydroxyls and keep neutral status. Our work has demonstrated the effective role of the surface water in tuning the morphologies as well as electronic states of the supported metals, which may bring new insights to a number of important surface processes with water in presence.