AVS 63rd International Symposium & Exhibition
    Surface Science Friday Sessions
       Session SS+HC-FrM

Paper SS+HC-FrM5
A Case Study of the SMSI Effects: CO Oxidation on the TiOx/Pt(111) Model Surfaces

Friday, November 11, 2016, 9:40 am, Room 104E

Session: Deposition and Analysis of Complex Interfaces
Presenter: Mingshu Chen, Xiamen University, China
Authors: M.S. Chen, Xiamen University, China
H. Li, Xiamen University, China
X.F. Weng, Xiamen University, China
H. Zhang, Xiamen University, China
H.L. Wan, Xiamen University, China
Correspondent: Click to Email
Well-ordered ultrathin TiOx films were grown on Pt(111) as model surfaces to probe the effects of the strong metal-support interaction (SMSI) on the catalytic performance. The model surfaces of TiOx/Pt(111) were prepared under UHV and characterized by low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES). CO oxidation was tested for the model surfaces in a batch reaction cell as a function of the TiOx coverages and structures. And a home-built reflection adsorption infrared spectroscopy (IRAS) was used for in-situ studying the surface species and stability of the model surfaces under the reaction conditions. The results show that catalytic activity could be improved significantly on the monolayer z-TiOx, while a maximum is achieved at 0.3~0.5 ML for the w-TiOx. The TiOx thin films were found to be stable under CO oxidation conditions. The activation energy for CO oxidation reaction on the 1 ML z-TiOx/Pt(111) was found to be 46 kJ/mol, which is much lower than that of 87 kJ/mol on the clean Pt(111) surface.