Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (2): 181-187.DOI: 10.1016/S1872-2067(14)60165-0

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A first principles study of the energetics and core level shifts of anion-doped TiO2 photocatalysts

Wuchen Ding, Weixue Li   

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 110623, Liaoning, China
  • Received:2014-05-16 Revised:2014-06-09 Online:2015-01-21 Published:2015-01-21
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21173210, 21225315, 21321002), the National Basic Research Program of China (973 Program, 2013CB834603), and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA09030000).

Abstract:

We present a comprehensive and improved density functional theory (DFT) calculation of anion-doped (anion = B, C, N, F, P, S) anatase and rutile TiO2. The first part is a first principles calculation of the core level shifts (CLS) for various anion dopants in both anatase and rutile TiO2. The CLS results revealed that interstitial N had a higher N 1s binding energy than substitutional N, which agreed well with experimental results. The calculation also showed that for B-, C-, S-, and P-doped TiO2, the interstitial dopant had an energy that is higher than that of a substitutional dopant, which is similar to N-doped TiO2. However, for F-doped TiO2, the energy of the substitutional dopant is higher, and this is irrespective of the TiO2 crystallography. We also calculated the enthalpy of doping and found that the substitutional dopant had a higher enthalpy than the interstitial dopant. The results revealed that substitutional doping required severe experimental conditions, whereas interstitial doping only requires modest wet chemistry conditions.

Key words: Titania, Core level shifts, X-ray photoelectron spectroscopy, Anion, Subtitutional doping, Interstitial doping, Density function theory, Thermodynamics