The photocatalytic activity of the doped TiO2 was enhanced by 1.9 times when the V ions were doped only in the surface lattice at a surface V/Ti molar ratio of 3.0 � 10-1, in contrast, bulk doping caused detrimental effects. Reduced species, including V3+ and V4+ ions, were formed in the interstitial anatase lattice. They introduced occupied and unoccupied energy levels close to and in the conduction band of TiO2, which inhibit charge diffusion to the surface through deep trapping. In contrast, the impurities present only in the surface lattice increased the number of surface trapped holes and facilitated the interfacial charge transfer from TiO2 to adsorbates. Heavy doping at the surface resulted in the formation of V2O5. The p-n junction between the TiO2 and V2O5 separated charge carriers and additionally promoted the photocatalytic activity of the surface-doped TiO2. In conclusion, surface doping is more beneficial than bulk doping to the photocatalytic activity of V-doped TiO2.

Is surface doping or bulk doping more beneficial to the photocatalytic activity of TiO<sub>2</sub>??

246th National Meeting (2013)

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Is surface doping or bulk doping more beneficial to the photocatalytic activity of TiO2??

Is surface doping or bulk doping more beneficial to the photocatalytic activity of TiO₂??