A situ hydrothermal synthesis of SrTiO3/TiO2 heterostructure nanosheets with exposed (0 0 1) facets for enhancing photocatalytic degradation activity
A situ hydrothermal synthesis of SrTiO3/TiO2 heterostructure nanosheets with exposed (0 0 1) facets for enhancing photocatalytic degradation activity
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DOI：
10.1016/j.apsusc.2014.07.100
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发表时间：
2014-11
影响因子：
6.7
通讯作者：
Xianyang Yue;Jiye Zhang;Fengpo Yan;Xian Wang;F. Huang
中科院分区：
文献类型：
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作者：
Xianyang Yue;Jiye Zhang;Fengpo Yan;Xian Wang;F. Huang
基于(0 0 1)晶面主导的锐钛矿型TiO2的异质结结构的设计和构建因其获得更高的光催化活性而备受关注。在这里，通过原位水热反应制备了不同 SrTiO3 含量的 SrTiO3/TiO2 异质结构纳米片，其中具有主要暴露（0 0 1）面的锐钛矿 TiO2 纳米片用作模板和初始反应物。与纯TiO2纳米片相比，SrTiO3/TiO2纳米片由于纳米-纳米异质结的形成而在降解罗丹明B（RhB）方面表现出更好的光催化活性。更重要的是，随着使用次数的增加，SrTiO3/TiO2复合材料表现出优异的光催化稳定性和出色的催化活性。研究发现，SrTiO3 纳米结构的粒径和形貌通过调节 TiO2 纳米片的粘附和聚集以及反应活性位点的数量来控制 SrTiO3/TiO2 复合材料的光催化活性。首次在有限的二维纳米片上原位制备SrTiO3/TiO2异质结结构，有利于理解SrTiO3从TiO2早期生长的过程。这些结果可能进一步促进SrTiO3/TiO2复合材料在环境净化、太阳能电池、传感器和光子光电器件中的应用。
Designingand constructing heterojunction structures based on (0 0 1) facets dominated anatase TiO2has attracted much attention for acquiring higher photocatalytic activity. Here, SrTiO3/TiO2heterostructure nanosheets with different SrTiO3contents were fabricated byin situhydrothermal reaction, in which anatase TiO2nanosheets with dominant exposed (0 0 1) facets were used as templates and initial reactants. Compared with pure TiO2nanosheets, SrTiO3/TiO2nanosheets exhibit better photocatalytic activity in degradation of rhodamine B (RhB) owing to the formation of nano–nano heterojunction. More importantly, the SrTiO3/TiO2composites exhibit excellent photocatalytic stability and outstanding catalytic activity with the increase of utilizing cycles. Particle size and morphology of SrTiO3nanostructures were found to dominate the photocatalytic activity of SrTiO3/TiO2composites through regulating the adhesion and aggregation of TiO2nanosheets as well as the number of reaction active sites. It is the first time to fabricate SrTiO3/TiO2heterojunction structure on limited two-dimensional nanosheetsin situ, which is beneficial for understanding the growth of SrTiO3from TiO2in initial period. These results may further promote the applications of SrTiO3/TiO2composites in environment cleanup, solar cells, sensors and photonic and optoelectronic devices.