| Autor: |
Xu, Tao, Adamsen, Kræn C., Falsig, Hanne, Rasmussen, Søren B., Li, Zheshen, Wendt, Stefan, Lauritsen, Jeppe V. |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. Materials 4, 124004 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevMaterials.4.124004 |
| Popis: |
We combined scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) experiments with density functional theory (DFT) calculations to study dispersed tungsta clusters on anatase TiO$_2$(101). Following two different preparation methods, we found that monomeric WO$_3$ species are the most stable configuration rather than WO$_3$ trimers, (WO$_3$)$_3$. The WO$_3$ monomers form tetrahedral WO$_4$ structures on anatase TiO$_2$(101), with one W$-$O bond and two W$-$O$-$Ti linkages per WO$_3$ monomer. Locally, the WO$_3$ monomers form well-ordered (2$\times$1) structures. The discovered geometric structure of WO$_3$ on anatase TiO$_2$(101) opens up numerous opportunities for fundamental studies addressing tungsta and accurate structure activity studies of WO$_3$/TiO$_2$ model catalysts. |
| Databáze: |
arXiv |
| Externí odkaz: |
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