共查询到5条相似文献,搜索用时 0 毫秒
1.
Novel, three-dimensional, flower-like Bi2O3/BiVO4 heterojunction photocatalysts have been prepared by the combination of homogeneous precipitation and two-step solvothermal method followed by thermal solution
of NaOH etching process. The as-obtained samples were fully characterized by X-ray diffraction, scanning
electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller surface area, and UV-vis diffusereflectance spectroscopy in detail. The crystallinity, microstructure, specific surface area, optical property and
photocatalytic activity of samples greatly changed depending on solvothermal reaction time. The photocatalytic
activities of samples were evaluated on the degradation of methyl orange (MO) under visible-light irradiation. The
Bi2O3/BiVO4 exhibited much higher photocatalytic activities than pure BiVO4 and conventional TiO2 (P25). The
result revealed that the three-dimensional heterojunction played a critical role in the separation of the electron and
hole pairs and enhancement of the interfacial charge transfer efficiency, which was responsible for the enhanced
photocatalytic activity. 相似文献
2.
Evidence and Effect of Photogenerated Charge Transfer for Enhanced Photocatalysis in WO3/TiO2 Heterojunction Films: A Computational and Experimental Study 下载免费PDF全文
Carlos Sotelo‐Vazquez Raul Quesada‐Cabrera Min Ling David O. Scanlon Pardeep Kumar Thakur Tien‐Lin Lee Alaric Taylor Graeme W. Watson Robert G. Palgrave James R. Durrant Christopher S. Blackman Ivan P. Parkin 《Advanced functional materials》2017,27(18)
Semiconductor heterojunctions are used in a wide range of applications including catalysis, sensors, and solar‐to‐chemical energy conversion devices. These materials can spatially separate photogenerated charge across the heterojunction boundary, inhibiting recombination processes and synergistically enhancing their performance beyond the individual components. In this work, the WO3/TiO2 heterojunction grown by chemical vapor deposition is investigated. This consists of a highly nanostructured WO3 layer of vertically aligned nanorods that is then coated with a conformal layer of TiO2. This heterojunction shows an unusual electron transfer process, where photogenerated electrons move from the WO3 layer into TiO2. State‐of‐the‐art hybrid density functional theory and hard X‐ray photoelectron spectroscopy are used to elucidate the electronic interaction at the WO3/TiO2 interface. Transient absorption spectroscopy shows that recombination is substantially reduced, extending both the lifetime and population of photogenerated charges into timescales relevant to most photocatalytic processes. This increases the photocatalytic efficiency of the material, which is among the highest ever reported for a thin film. In allying computational and experimental methods, this is believed to be an ideal strategy for determining the band alignment in metal oxide heterojunction systems. 相似文献
3.
Photocatalysis: Evidence and Effect of Photogenerated Charge Transfer for Enhanced Photocatalysis in WO3/TiO2 Heterojunction Films: A Computational and Experimental Study (Adv. Funct. Mater. 18/2017) 下载免费PDF全文
Carlos Sotelo‐Vazquez Raul Quesada‐Cabrera Min Ling David O. Scanlon Andreas Kafizas Pardeep Kumar Thakur Tien‐Lin Lee Alaric Taylor Graeme W. Watson Robert G. Palgrave James R. Durrant Christopher S. Blackman Ivan P. Parkin 《Advanced functional materials》2017,27(18)
4.