Influence of Surface Oxygen Vacancies on the Photocatalytic Activity of Nanocrystalline TiO2Report as inadecuate




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The influence of surface oxygen vacancies on the photo-generated charge carrier separation and photocatalytic activity in nanocrystalline TiO2 has been investigated in this work. The X-ray photoelectron spectra reveal that more surface oxygen vacancies are produced in the air-annealing sample compared to the oxygen-annealing sample. It is found that more oxygen vacancies produce more recombination centers, which causes weaker intensity of the surface photovoltaic spectroscopy signal in the air-annealing sample due to lower separation rate of photo-generated charge carriers. Simultaneously, more oxygen vacancies also yield more photocatalytic reactive centers and improve the photocatalytic activity for the air-annealing sample.

KEYWORDS

TiO2; Oxygen vacancy; Photogenerated charge carrier; Photocatalytic activity

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Author: Hua-rong Zhang, Hai-wu Zheng, Yu-zong Gu, Yong Liang, Yu-rui Cao, Ke-qi Tan

Source: http://www.scirp.org/



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