Anatase TiO₂ sheet-assisted synthesis of Ti³⁺ self-doped mixed phase TiO₂ sheet with superior visible-light photocatalytic performance: Roles of anatase TiO₂ sheet

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• 作者：Xiaojie Zhang^a ; Guoqing Zuo^a ; Xin Lu^a ; Changqing Tang^a ; ^{jytcq@126.com} ; Shuo Cao^b ; Miao Yu^c ; ^{yumiao@cec.sc.edu}
• 关键词：Ti3+ self-doped TiO2 ; Photocatalytic CO2 reduction ; Visible light
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：490
• 期：Complete
• 页码：774-782
• 全文大小：2277 K
• 卷排序：490

文摘

On the basis of measurements, such as field emission scanning electron microscope, UV–Vis diffuse reflectance spectra, X-ray diffraction, electron paramagnetic resonance, photoluminescence spectra, and photocurrent measurements, the roles of anatase TiO2 sheet on synthesizing Ti3+ self-doped mixed phase TiO2 nanosheets (doped TiO2 (A/R, TiO2 (A))) and on improving the performance for photocatalytic CO2 reduction were explored systematically. High surface area anatase TiO2 nanosheets (TiO2 (A)) as a substrate, structure directing agent, and inhibitor, mediated the synthesis of Ti3+ self-doped mixed phase TiO2 nanosheets. Addition of TiO2 (A) significantly improved not only visible light absorption of doped TiO2 (A/R, TiO2 (A)), but also the efficiency of photo-excited charges separations due to the existence of interfacial regions of anatase-rutile TiO2 junctions. Finally, a possible mechanism for interfacial charge transfer at the anatase-rutile TiO2 interface and for photocatalytic CO2 reduction over Pt loaded doped TiO2 (A/R, TiO2 (A)) were proposed.