کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5363633 | 1388304 | 2011 | 7 صفحه PDF | دانلود رایگان |
Oxygen adsorptions on anatase surfaces and edges are investigated with semi-empirical method MSINDO. After adsorption, an O2â forms on (1Â 0Â 1) and (1Â 0Â 0) surfaces and facets related edges, while a Ti-O-O-O-Ti bridge forms on the (0Â 0Â 1) surface or (0Â 0Â 1) surface related edges. Electrons transfer from the anatase to the adsorbed oxygen molecules which can be used to hinder the electron hole recombination during the photo-catalytic processes. Oxygen adsorption on (0Â 0Â 1) surfaces and (0Â 0Â 1) facets related edges are more energetic favorable than the adsorption on (1Â 0Â 1) and (1Â 0Â 0) facets or related edges. For the adsorptions on (1Â 0Â 1), (1Â 0Â 0) surfaces and the edges related with those two facets, edge adsorptions are more energetic favorable than the surface adsorptions. We do not see this edge effect on the (0Â 0Â 1) surface. Small size particles with more edges or particles with more (0Â 0Â 1) facets can adsorb more oxygen molecules and hinder the electron hole recombination more efficiently, and those adsorbed oxygen molecules may also oxidize other absorbed small toxic gas molecules.
⺠After adsorption, an O2â forms on (1 0 1) and (1 0 0) surfaces and facets related edges, while a Ti-O-O-O-Ti bridge forms on the (0 0 1) surface or (0 0 1) surface related edges. ⺠Electrons transfer from the anatase to the adsorbed oxygen molecules which can be used to hinder the electron hole recombination during the photo-catalytic processes. ⺠Oxygen adsorption on (0 0 1) surfaces and (0 0 1) facets related edges are more energetic favorable than the adsorption on (1 0 1) and (1 0 0) facets or related edges. ⺠For the adsorptions on (1 0 1), (1 0 0) surfaces and the edges related with those two facets, edge adsorptions are more energetic favorable than the surface adsorptions. We do not see this edge effect on the (0 0 1) surface.
Journal: Applied Surface Science - Volume 257, Issue 20, 1 August 2011, Pages 8402-8408