期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.266103
关键词
-
资金
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences
- Chemical Imaging Initiative at Pacific Northwest National Laboratory (PNNL)
- DOE's Office of Biological and Environmental Research
Scanning tunneling microscopy results reveal a pronounced site selectivity in the hole-mediated photooxidation of trimethyl acetate (TMA) on TiO2(110), wherein the reaction readily occurs at regular Ti sites but is completely inhibited at oxygen vacancy (V-O) defects. Utilizing electron energy loss spectroscopy and density functional theory, we show that the lack of reactivity of TMA groups adsorbed at V-O's cannot be attributed to either a less active adsorption conformation or electron transfer from the V-O defect. Instead, we propose that the excess unpaired electrons associated with the V-O promptly recombine with photoexcited holes approaching the surface, effectively screening TMA species at the V-O site. We also show that this screening effect is predominately localized at the V-O, only mildly affecting TMA's at adjacent Ti sites. DOI: 10.1103/PhysRevLett.109.266103
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