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Ultrafine ZnO quantum dot-modified TiO2 composite photocatalysts: the role of the quantum size effect in heterojunction-enhanced photocatalytic hydrogen evolution†
Catalysis Science & Technology ( IF 5 ) Pub Date : 2018-01-22 00:00:00 , DOI: 10.1039/c7cy02310c
Qian Chen 1, 2, 3, 4, 5 , Ruifeng Tong 1, 2, 3, 4, 5 , Xianjie Chen 1, 5, 6, 7 , Yakun Xue 1, 2, 3, 4, 5 , Zhaoxiong Xie 1, 2, 3, 4, 5 , Qin Kuang 1, 2, 3, 4, 5 , Lansun Zheng 1, 2, 3, 4, 5
Affiliation  

Quantum dot (QD) modification has been recently demonstrated to be a highly efficient strategy to improve the photocatalytic performance of wide band gap semiconductor nanocrystals like TiO2. However, it remains a great challenge to controllably construct QD-modified composite photocatalysts via facile processes, which limits our understanding of the role of QDs in heterojunction-enhanced photocatalysis to some extent. In this work, we reported the fabrication of ZnO QD-modified TiO2 nanowire (NW)-based composite photocatalysts via a facile calcination treatment method. The structure analysis indicated that ZnO QDs were uniformly loaded onto the surface of TiO2 NWs and their particle size could be tuned by simply adjusting the amount of the zinc precursor added. Under simulated solar irradiation, the as-prepared ZnO QD-decorated TiO2 NWs exhibited remarkably enhanced photocatalytic activity in water splitting reaction compared to the bare TiO2 NWs and commercial photocatalyst P25. The rate of hydrogen evolution on the optimal sample TZ-0.6% was double and four times that obtained on the bare TiO2 NWs and P25, respectively. Based on systematic photoelectric characterization, it can be concluded that the excellent photocatalytic performance of these composite photocatalysts was attributed to the synergism between heterojunction-induced effective interfacial charge carrier migration and the size-dependent quantum confinement effect.

中文翻译:

超细ZnO量子点修饰的TiO 2复合光催化剂:量子尺寸效应在异质结增强的光催化氢生成中的作用

量子点(QD)修饰最近已被证明是一种高效的策略,可以改善诸如TiO 2的宽带隙半导体纳米晶体的光催化性能。然而,通过简便的方法可控地构建QD改性的复合光催化剂仍然是一个巨大的挑战,这在一定程度上限制了我们对QD在异质结增强光催化中的作用的理解。在这项工作中,我们报告了通过简便的煅烧处理方法制备ZnO QD改性的TiO 2纳米线(NW)基复合光催化剂。结构分析表明,ZnO QDs均匀地负载在TiO 2的表面上净重及其粒径可通过简单地调节所添加的锌前体的量来调节。在模拟太阳辐射下,与裸露的TiO 2 NW和商用光催化剂P25相比,制备的ZnO QD修饰的TiO 2 NW在水分解反应中表现出显着增强的光催化活性。最佳样品TZ-0.6%上的氢气析出速率是裸TiO 2上的两倍和四倍。NW和P25。基于系统的光电表征,可以得出结论,这些复合光催化剂的优异光催化性能归因于异质结诱导的有效界面电荷载流子迁移与尺寸依赖的量子约束效应之间的协同作用。
更新日期:2018-01-22
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