期刊
NANOSCALE
卷 11, 期 46, 页码 22575-22584出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr06595d
关键词
-
类别
资金
- National Natural Science Foundation of China [61674011, 61735004]
- Natural Science Foundation of Beijing Municipality [4172050]
- Fundamental Research Funds for the Central Universities [2019RC020]
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission [NERE201903]
Anatase TiO2 materials are well-known for their photocatalytic properties and their structure-performance relationship has been intensively studied over the past few decades. In this study, we report a versatile strategy to control the geometric and electronic structure of hierarchical anatase TiO2 nanocrystals via a colloidal synthesis technique in order to optimize their photocatalytic performances. The synthesis is modified from a classical nonaqueous sol-gel approach in which titanium alkoxides and long carbon chain carboxylic acids are used as titanium sources and hydrolysis/capping agents, respectively. By introducing fluoride ions into the reaction as competitive capping agents and controlling other parameters, the geometric structure of TiO2 nanocrystals can be regulated from nanorods and nanobipyramids to their hierarchical assembly structures with controlled dimension and crystallinity. Meanwhile, it is confirmed that the fluoride capping agents also affect the surface structure of TiO2 by fluorine doping, which exerts an additional impact on the electronic structure of TiO2 nanocrystals apart from morphology variation. Further investigation of photocatalytic hydrogen production performances of TiO2 nanocrystals with different structures indicates that the catalytic efficiency is highly dependent on structural factors including hierarchical shape, surface area and doping status. Obvious improvement of photocatalytic performance is observed in the optimized hierarchical TiO2 nanocrystals (2033.6 mu mol g(-1) h(-1)) compared to that in commonly prepared TiO2 nanobipyramids (1135.5 mu mol g(-1) h(-1)) and other hierarchical TiO2 nanocrystals (1331.9 mu mol g(-1) h(-1) or lower), which demonstrates the effectiveness of material optimization by the strategy developed in this study.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据