Exploring the nature of hydrogen of Rutile TiO₂(110) at 78K
Exploring the nature of hydrogen of Rutile TiO₂(110) at 78K
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探索 78K 下金红石 TiO−(110) 的氢性质
DOI：
10.1016/j.surfin.2021.101339
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发表时间：
2021
影响因子：
6.2
通讯作者：
Yan Jun Li
中科院分区：
文献类型：
--
作者：
Huan Fei Wen;Sugawara Yasuhiro;Yan Jun Li
金红石型TiO 2表面或亚表面的氢由于其过剩的电子而在表面化学反应和催化反应中起着重要的作用。本文利用原子力显微镜（AFM）/扫描隧道显微镜（STM）系统地研究了氢原子的性质，并利用开尔文探针力谱（KPFS）研究了氢原子在表面和亚表面之间的脱附和转移行为及机理。动态和静态扫描隧道显微镜观察到表面氢（Hsurf）和亚表面氢（Hsub）的原子对比度明显。系统地研究了Hsub-Hsub相互作用，证明了具有相同极性的物种的不排斥效应。更重要的是，通过KPFS性能成功地操纵了样品表面和亚表面之间的可逆氢原子转移，并提出了氢转移进行的机理，即尖端-样品空间之间的力场与电场一起降低了势垒的高度和宽度，从而导致氢原子转移。本研究为氢原子的性质和操控提供了新的认识，并为新型金属氧化物催化剂的设计提供了理论依据。
The hydrogen on the surface or in the subsurface of rutile TiO2play an important role in the surface chemical reactions and understanding the catalytic reactions due to its excess electrons. In this work, we have systematically explored the nature of hydrogen atom by atomic force microscopy (AFM)/scanning tunneling microscopy (STM) and investigated the behaviors and mechanism of hydrogen atom desorption and transfer between the surface and subsurface by Kelvin probe force spectroscopy (KPFS). The atomic contrast of surface hydrogen (Hsurf) and subsurface hydrogen (Hsub) are clearly identified by dynamic and static STM. The Hsub-Hsubinteractions are systematically investigated, demonstrating the unusual no-repulsive effect of species with the same polarity. Importantly, the reversible hydrogen atom transfer between the sample surface and subsurface was successfully manipulated by KPFS performance, and mechanism of hydrogen transfer proceeds was proposed that force field together with electric field between the tip-sample space reduce the height and width of barrier resulting in the hydrogen atom transfer. The present study is expected to provide some new insights into the nature and manipulation of hydrogen atom and is useful to design the new catalyst of metal oxide.