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Interfacial oxygen vacancy layer of a Z-scheme BCN–TiO2 heterostructure accelerating charge carrier transfer for visible light photocatalytic H2 evolution†
Catalysis Science & Technology ( IF 5 ) Pub Date : 2018-06-22 00:00:00 , DOI: 10.1039/c8cy01035h
Xiaolei Xing 1, 2, 3, 4, 5 , Huihui Zhu 1, 2, 3, 4, 5 , Min Zhang 1, 2, 3, 4, 5 , Lili Hou 1, 2, 3, 4, 5 , Qiuye Li 1, 2, 3, 4, 5 , Jianjun Yang 1, 2, 3, 4, 5
Affiliation  

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.

中文翻译:

Z型BCN-TiO 2异质结构的界面氧空位层促进了载流子的转移,促进了可见光的光催化H 2的演化

通过NaBH 4还原和球磨制备了以表面氧空位层为接触界面的全固态Z方案BCN-TiO 2二元异质结构。彻底研究了BCN-TiO 2二元异质结构的表面氧空位层对电荷载流子转移和光催化氢释放的影响。紫外可见漫反射光谱结果表明,BCN-TiO 2的表面氧空位可以将吸收的光从紫外扩展到可见光区域二元异质结构。稳态/时间分辨的光致发光光谱显示出增加的载流子寿命,改善的载流子分离效率和增强的BCN-TiO 2 - x异质结构的直接Z方案电荷转移过程。正如预期的那样,BCN-TiO 2 - x异质结构表现出更高的可见光光催化效率,比纯TiO 2的高7到11倍和BCN样本。即,通过构造表面氧空位层,可以大大促进析氢的光催化活性。这项工作为构建直接Z方案系统的有效接触层提供了一条新途径,以改善电荷载流子的分离和转移,从而改善光催化活性。
更新日期:2018-06-22
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