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Graded bandgap semiconductor thin film photoelectrodes

Chinese Science Bulletin 2001年第11期46卷 914-918页

作者： ZHAO Gaoling SONG Bin HAN Gaorong Hiromitsu Kozuka Toshinobu Yoko State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Physics and State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310027China institute for Chemical Research Kyoto UniversityUjiKyoto-Fu 611-0011Japan

A graded bandgap oxide semiconductor thin film electrode was designed in order to obtain a photoelec-trochemically stable photoelectrode, with wide absorption range. The graded bandgap Ti1-xVxO2 film electrode was prepared by heating the stacked layers of V/Ti in varying ratios, which were coated on the substrate by the sol-gel method using the starting solution with various V/Ti ratios. XPS result showed that the composition gradient was achieved for the film. The Ti1-xVxO2 film electrode was found to be photoelectrochemically stable. Its photovoltage was about 360 mV. Obvious visible light photoresponse was observed for the Ti1-xVxO2 film electrode. Compared with the pure TiO2 electrode, the photocurrent onset potential of the Ti1-xVxO2 film electrode was shifted positively, probably because the accumulation of vanadium at the electrode surface causes the recombination of the electrons and holes, and the lowest level of the conduction band of Ti1-xVxO2 is lower than that of TiO2. Impedance

关键词： graded bandgap sol-gel method photoelectrode.

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Morphology-Controlled Synthesis of Zn_xCd_1-xS Solid Solutions: An Efficient Solar Light Active Photocatalyst for the Degradation of 2,4,6-Trichlorophenol

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Journal of Environmental Protection 2016年第11期7卷 1605-1617页

作者： Rengaraj Selvaraj Kezhen Qi Sathish Babu Soundra Pandian Mohammed A. Meetani Bushra Al Wahaibi Haider Al Lawati Salma M. Z. Al Kindy Younghun Kim Mika Sillanpää Department of Chemistry College of Science Sultan Qaboos University Muscat Sultanate of Oman Laboratory of Green Chemistry LUT Savo Sustainable Technology Lappeenranta University of Technology Mikkeli Finland institute of Catalysis for Energy and Environment College of Chemistry and Chemical Engineering Shenyang Normal University Shenyang China CAARU College of Science Sultan Qaboos University Muscat Sultanate of Oman Department of Chemistry United Arab Emirates University Al Ain UAE Department of Chemical Engineering Kwangwoon University Seoul South Korea

ZnxCd1-xS solid solutions with controlled morphology have been successfully synthe-sized by a facile solution-phase method. The prepared samples were characterized by X-ray powder diffraction (XRD), UV-vis diffuse reflectance spectra, X-ray photoelec-tron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission elec-tron microscopy (TEM). The photocatalytic activity of ZnxCd1-xS was evaluated in the 2,4,6-trichlorophenol (TCP) degradation and mineralization in aqueous solution under direct solar light illumination. The experiment demonstrated that TCP was effectively degraded by more than 95% with 120 min. The results show that ZnS with Cd doping (ZnxCd1-xS) exhibits the much stronger visible light adsorption than that of pure ZnS, the light adsorption increasing as the Cd2+ doping amount. These results indicate that Cd doping into a ZnS crystal lattice can result in the shift of the valence band of ZnS to a positive direction. It may lead to its higher oxidative ability than pure ZnS, which is important for organic pollutant degradation under solar light irradiation. Further-more, the photocatalytic activity studies reveal that the prepared ZnxCd1-xS nanostructures exhibit an excellent photocatalytic performance, degrading rapidly the aqueous 2,4,6-trichlorophenol solution under solar light irradiation. These results sug-gest that ZnxCd1-xS nanostructure will be a promising candidate of photocatalyst working in solar light range.

关键词： Photocatalyst Nanostructures Solution Phase 2 4 6-Trichlorophenol Solar Light Photocatalytic Activity

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