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Structure and Reactivity of Anatase TiO2(001)-(1 × 4) Surface
作者:孫慧娟,呂文彩,Jin Zhao*
關鍵字:Anatase TiO2
論文來源:期刊
具體來源:The Journal of Physical Chemistry C,(2018) 122, 14528
發表時間:2018年

TiO2 anatase (001) surface which usually exhibits (1× 4) surface reconstruction has attracted lots of research interests for its potentially high photocatalytic activity. The atomic structure

of the reconstruction and defects of this surface play an important role on its reactivity. Besides the well-known add-molecule model reconstruction, the add-oxygen model (AOM) for anatase (001)-(1× 4)-reconstructed surface by adding one oxygen atom to each Ti4C

atom was proposed. In this work, we investigate the geometric and electronic structures as well as the H2O and O2 adsorption behavior on anatase (001) surface with AOM systematically. The different defect structures including oxygen vacancy (OV), Ti interstitial

(Tiini), and TiO2 vacancy (TiO2)V are also studied. Our calculations show that oxidization makes the AOM surface inert to molecular adsorption. The TiO2 vacancy with Ti interstitial, (TiO2)V?Tiini, is found to be the only reactive site for water and oxygen molecules adsorbing on the TiO2 anatase (001)-(1 × 4)-reconstructed surface. The investigations based on AOM can explain the atomic-resolved scanning tunneling microscopy results appropriately.

Our systematic study of the AOM reconstruction of anatase (001) provides new insights into the understanding of the structure and reactivity on this surface.


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