Photoinduced Charge Transfer Properties and Photocatalytic Activity in Bi2O3/BaTiO3 Composite Photocatalyst

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• 作者：Haimei Fan ; Haiyan Li ; Bingkun Liu ; Yongchun Lu ; Tengfeng Xie ; Dejun Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：September 26, 2012
• 年：2012
• 卷：4
• 期：9
• 页码：4853-4857
• 全文大小：378K
• 年卷期：v.4,no.9(September 26, 2012)
• ISSN：1944-8252

文摘

A series of Bi₂O₃/BaTiO₃ composite photocatalysts with different mass ratios of Bi₂O₃ vs BaTiO₃ were prepared by an impregnating-annealing method. X-ray diffraction (XRD), high-resolution transmission electron microscopic (HRTEM), and UV鈥搗is diffuse reflection spectroscopy (DRS) confirmed that Bi₂O₃ and BaTiO₃ coexisted in the composites. The results of surface photovoltage (SPV) experiments showed enhancements of photovoltaic response in composites, which indicated a higher separation efficiency of photoinduced charges due to the establishment of an efficient interfacial electric field between Bi₂O₃ and BaTiO₃ in the composites. The consistency of phtocatalytic activity and photovoltaic response intensity of photocatalysts showed that the efficiency interfacial electric field between Bi₂O₃ and BaTiO₃ played an important role in improving the degradation efficiency of Rhodamine B (RhB). The 60%-Bi₂O₃/BaTiO₃ sample with the best activity was found by optimizing the mass ratios of Bi₂O₃ vs. BaTiO₃. On the basis of the work function (WF) measurements, a reasonable energy band diagram was proposed for BaTiO₃/Bi₂O₃ composite. It would be helpful in designing and constructing high efficiency heterogeneous semiconductor photocatalyst.

Keywords:

Bi₂O₃/BaTiO₃ composite; photocatalytic; photovoltage; charge transfer; work function; interface