Ti3+ self-doped mesoporous black TiO2/graphene assemblies for unpredicted-high solar-driven photocatalytic hydrogen evolution
| Autor: | Lihua Li, Guo Zhou, Haiyan Meng, Xuejun Kou, Zipeng Xing, Jia Mi, Qingguo Xu, Zhenzi Li, Shuxiang Duan, Xunying Zhang, Min Zhao, Leilei Fan, Liyan Shen |
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| Rok vydání: | 2017 |
| Předmět: |
Anatase
Materials science Graphene Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Biomaterials Mesoporous organosilica symbols.namesake Colloid and Surface Chemistry Chemical engineering X-ray photoelectron spectroscopy law Photocatalysis symbols 0210 nano-technology Mesoporous material Raman spectroscopy Visible spectrum |
| Zdroj: | Journal of Colloid and Interface Science. 505:1031-1038 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2017.06.097 |
| Popis: | Ti3+ self-doped mesoporous black TiO2/graphene assemblies are fabricated by a facile solvothermal method and surface hydrogenation. The structure, crystallinity, morphology, and chemical state of the as-prepared samples are characterized in detail by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, transmission electron microscopy, N2 adsorption and UV-visible diffuse reflectance spectroscopy. The results show that the presence of Ti3+ can efficiently extend the photoresponse of anatase TiO2 to visible light region. The solar-driven photocatalytic hydrogen evolution shows that Ti3+ self-doped mesoporous black TiO2/graphene assemblies exhibit the highest photocatalytic activity (186μmolh-1 0.01g-1), exceeding to mesoporous TiO2/graphene assemblies and mesoporous black TiO2. It also exhibits superior photoelectrochemical properties compared with mesoporous TiO2/graphene assemblies. The unpredicted-high photocatalytic performance is attributed to the close contact between the unique two-dimensional graphene structures coupled with TiO2 mesoporous architectures resulting in outstanding charge separation efficient and the Ti3+ self-doping extending the utilization ratio of visible light. |
| Databáze: | OpenAIRE |
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