Enhanced photocatalytic activity by bulk trapping and spatial separation of charge carriers: A case study of defect and facet mediated TiO2
Enhanced photocatalytic activity by bulk trapping and spatial separation of charge carriers: A case study of defect and facet mediated TiO2
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通过载流子的体捕获和空间分离增强光催化活性：缺陷和面介导的 TiO2 案例研究
DOI：
10.1016/j.apcatb.2015.06.045
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Liu Ping
中科院分区：
文献类型：
--
作者：
Pei Zengxia;Weng Sunxian;Liu Ping
揭示给定光催化剂的组成和结构之间的相互作用，可以深入了解光催化机理，也是优化光催化活性的有效途径。本研究通过研究易氧化反应合成的缺陷和面介导金红石型tio2的性质和性能，证明了大量的自掺杂缺陷不仅可以对还原tio2产生明显的响应，还可以通过体俘获抑制载流子的快速重组，而{11 11}-{11 10}面对可以诱导e-h对的空间分离。在共介导的TiO2中，缺陷和切面之间存在协同效应，在模拟太阳光照下，与参考的商业金红石相比，其解氢性能提高了18倍。目前的工作揭示了新的光如何组成和结构的材料可以微调和协同工作，以实现大大提高的性能。
Revealing the interplay between composition and structure of a given photocatalyst allows in-depth understanding of the photocatalytic mechanism and also presents as an effective way to optimise the photocatalytic activity. In this work, by studying the property and performance of defect and facet mediated rutile TiO2synthesized via a facile oxidation reaction, we demonstrated that the abundant self-doped defects can not only render visiblie responce to the reduced TiO2but also supress the prompt recombination of the charge carriers through bulk trapping, while the {1 1 1}–{1 1 0} facet couples can induce the spatial separation of the e–h pairs. A synergistic effect between the defects and the facets was observed in the co-mediated TiO2, and its performance of hydrogen liberation was enhanced by a factor of 18 under simulated solar light compared with referenced commercial rutile, consequently. The present work sheds new light on how the composition and structure of a material can be finely tuned and work synergistically to achieve a much boosted performance.
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