Interfacial oxygen vacancy layer of a Z-scheme BCN-TiO2 heterostructure accelerating charge carrier transfer for visible light photocatalytic H-2 evolution

Xing Xiaolei; Zhu Huihui; Zhang MinHou LiliLi QiuyeYang Jianjun

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Interfacial oxygen vacancy layer of a Z-scheme BCN-TiO2 heterostructure accelerating charge carrier transfer for visible light photocatalytic H-2 evolution

机译：界面氧空位Z-scheme层BCN-TiO2异质结构加速电荷对可见光的光催化载体转移2进化

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All-solid-state Z-scheme BCN-TiO2 binary heterostructures with a surface oxygen vacancy layer as the contact interface are fabricated by NaBH4 reduction and ball milling. The effect of the surface oxygen vacancy layer of BCN-TiO2 binary heterostructures on the charge carrier transfer and photocatalytic hydrogen evolution was thoroughly investigated. UV-vis diffuse reflection spectra results reveal that the surface oxygen vacancy can extend the light absorption from the UV to the visible-light region for BCN-TiO2 binary heterostructures. The steady-state/time-resolved photoluminescence spectra exhibit an increased charge carrier lifetime, improved charge carrier separation efficiency and strengthened direct Z-scheme charge transfer process for BCN-TiO2-x heterostructures. As expected, the BCN-TiO2-x heterostructures exhibited a higher visible-light photocatalytic efficiency, about 7 and 11 times higher than that of the pure TiO2 and BCN samples. Namely, the photocatalytic activity of hydrogen evolution can be greatly promoted by constructing the surface oxygen vacancy layer. This work provides a new pathway to construct an efficient contact layer for the direct Z-scheme system to improve the charge carrier separation and transfer and thereby improve the photocatalytic activity.

机译：全固态Z-scheme BCN-TiO2二进制异质结构表面氧空位层的接触界面是捏造出来的减少NaBH4和球磨。表面氧空位BCN-TiO2层双异质结构的电荷载体转让、光催化氢进化被彻底调查。反射光谱结果显示,表面氧空位可以扩展光从紫外到可见光吸收地区BCN-TiO2二进制异质结构。稳态和时间分辨光致发光光谱表现出增加电荷载体一生中,改进的电荷载体分离直接Z-scheme效率和加强BCN-TiO2-x电荷转移过程异质结构。异质结构表现出较高的可见光光催化效率,7和11倍高于纯二氧化钛和BCN样本。氢进化可以大大提升构建表面氧空位层。这项工作提供了一种新的途径来构建一个高效的直接Z-scheme接触层系统提高电荷载体分离和转移,从而提高光催化活性。

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《Catalysis science & technology》 |2018年第14期|3629-3637|共9页
作者
Xing Xiaolei; Zhu Huihui; Zhang MinHou LiliLi QiuyeYang Jianjun;
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作者单位

Henan Univ, Collaborat Innovat Ctr NanoFunct Mat & Applicat H, Natl & Local Joint Engn Res Ctr Appl Technol Hybr, Kaifeng 475004, Peoples R China;

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正文语种英语
中图分类汉语教学;
关键词
Heterostructures; oxygen; Hydrogen evolutioncontact interfaceVisible Lightcarrier transfercarrier lifetime;

机译：异质结构;氧气;氢evolutioncontactinterfaceVisible Lightcarrier transfercarrier一生;

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Interfacial oxygen vacancy layer of a Z-scheme BCN-TiO2 heterostructure accelerating charge carrier transfer for visible light photocatalytic H-2 evolution

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