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First-Principles Calculations on Electronic Structures of N/V-Doped and N-V-Dodoped Anatase TiO2 (101) Surfaces

Authors

  • Dr. Zongyan Zhao,

    Corresponding author
    1. Ecomaterials and Renewable Energy Research Center (ERERC), National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (People's Republic of China), Fax: (+86) 25-83686632
    2. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093 (People's Republic of China), Fax: (+86) 871-5188856
    • Ecomaterials and Renewable Energy Research Center (ERERC), National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (People's Republic of China), Fax: (+86) 25-83686632
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  • Dr. Zhaosheng Li,

    1. Ecomaterials and Renewable Energy Research Center (ERERC), National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (People's Republic of China), Fax: (+86) 25-83686632
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  • Prof. Dr. Zhigang Zou

    1. Ecomaterials and Renewable Energy Research Center (ERERC), National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (People's Republic of China), Fax: (+86) 25-83686632
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Abstract

The energetic and electronic properties of N/V-doped and N-V-codoped anatase TiO2 (101) surfaces are investigated by first-principles calculations, with the aim to elucidate the relationship between the electronic structure and the photocatalytic performance of N-V-codoped TiO2. Several substitutional and interstitial configurations for the N and/or V impurities in the bulk phase and on the surface are studied, and the relative stability of different doping configurations is compared by the impurity formation energy. Systematic calculations reveal that N and V impurities can be encapsulated by TiO2 to form stable structures as a result of strong N-V interactions both in the bulk and the surface model. Through analyzing and comparing the electronic structures of different doping systems, the synergistic doping effects are discussed in detail. Based on these discussions, we suggest that NOVTi codoping cannot only narrow the band gap of anatase TiO2, but also forms impurity states, which are propitious for the separation of photoexcited electron–hole pairs. In the case of NOVTi-codoped TiO2 (101) surfaces, this phenomenon is especially prominent. Finally, a feasible synthesis route for NOVTi codoping into anatase TiO2 is proposed.

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