UHV-FTIRS studies on molecular competitive adsorption: (CO)-C-12, (CO)-C-13 and CO2 on reduced TiO2(110) surfaces

作者：Xu, Mingchun^*; Cao, Yunjun; Xu, Renbo; Hu, Shujun; Yan, Shishen

来源：Physical Chemistry Chemical Physics, 2014, 16(43): 23711-23715.

DOI：10.1039/c4cp03158j

• SITES
• PHOTOCATALYSIS
• DESORPTION
• SCIENCE
• DISPLACEMENT
• GENERATION
• DYNAMICS
• INSIGHTS
• OXYGEN
• WELL

Competitive adsorption of prototype molecules such as (CO)-C-12, (CO)-C-13 and CO2 at the two typical fivefold coordinated Ti-5c(4+) cation sites of reduced rutile TiO2(110) surfaces was studied in a newly designed UHV-FTIR system. The measured binding energies of (CO)-C-12, (CO)-C-13 or CO2 adsorbed at two kinds of Ti-5c(4+) sites are different. The molecular occupying probability at these sites depends on the binding energy of the adsorbed molecules; while, the molecular exchanging probability at these sites depends on their binding energy difference due to the presence of competitive adsorption. A simple thermodynamic equilibrium model was proposed to qualitatively interpret the adsorption and competitive adsorption mechanisms. These results will contribute to the elucidation of the (photo) catalytic process on TiO2(110) surfaces.

• 出版日期2014
• 单位山东大学