| TiO2表面NiO光催化活性中心的构建及其光催化析氢性能研究 |
| Fabrication of NiO Photocatalytic Active Center over TiO2 and Photocatalytic Properties for H2 Production |
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| 摘要: 本文采用离子快速注入法，在低温条件下利用微量NiO物种对TiO2光催化剂表面微结构进行了修饰和改性，构建了NiO光催化反应活性中心。研究结果表明，Ni物种是以TiO2-NiO-H形式存在于TiO2表面；相对于未修饰的TiO2光催化剂，NiO的修饰很大程度上提高了其光催化析氢性能，在最佳条件下，放氢速率由1.1 μmol·h-1提高到241.4 μmol·h-1。另外，Ni物种含量，热处理温度，乙醇电子给体浓度，催化剂悬浮浓度对光催化析氢性能也有明显的影响。光电化学实验结果表明，NiO的表面修饰能够产生有效的光催化反应活性中心，增强了光生电子-空穴电子对的分离效果。所制备的光催化剂采用Ｘ射线粉末衍射(XRD)，光电子能谱(XPS)等技术进行表征。 |
| 关键词: NiO修饰 TiO2 光催化 析氢 光电化学 |
| 基金项目: |
| Abstract: The surface microconstrure of TiO2 photocatalyts was modified and optimized with NiO-H species at low-temperature using ion quick-impregnation method. The catalysts were characterized with X-ray diffraction (XRD), and X-ray photoelectron spectrometer (XPS). The results show that a small amount of Ni2+ ion was deposited on the surface of TiO2 in TiO2-NiO-H form, an appropriate amount of NiO modified on TiO2 photocatalyst exhibited a great improvement in hydrogen production as compared with the bare TiO2, and under the optimal condition, the hydrogen production rates have increased from 1.1 μmol·h-1 to 241.4 μmol·h-1. The Ni content, heat-treatment, ethanol content, pH value, and catalyst content have obvious effects on the hydrogen production rate. The results of the photoelectrochemical studies show that the appropriate amount of NiO modified on TiO2 photocatalyst could produce photocatalytic reaction sites -TiO2-NiO-H for the photoinduced hole, and enhance the separation of the photo-induced electron-hole pairs. |
| Keywords: NiO modification TiO2 photocatalysis H2 production photoelectrochemistry |
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| 吴玉琪,吕功煊,李树本.TiO2表面NiO光催化活性中心的构建及其光催化析氢性能研究[J].无机化学学报,2010,26(3):476-482. |
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