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首页> 外文期刊>Catalysis science & technology >Ultrafine ZnO quantum dot-modified TiO2 composite photocatalysts: the role of the quantum size effect in heterojunction-enhanced photocatalytic hydrogen evolution
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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

机译：超细氧化锌量子dot-modified二氧化钛复合论文:量子尺寸的作用在heterojunction-enhanced光催化效果氢进化

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摘要

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.
机译：量子点(QD)修改最近证明是一种高效的策略提高光催化的性能带隙半导体二氧化钛纳米晶体。然而,它仍然是一个巨大的挑战可控构造QD-modified复合论文通过简单流程,这限制了我们对量子点的角色的理解heterojunction-enhanced光催化一些程度。的氧化锌QD-modified二氧化钛纳米线(西北)的通过一个简单煅烧复合催化剂治疗方法。表明,氧化锌量子点是均匀装上二氧化钛表面的NWs及其颗粒大小可以调整,只需调整的数量吗锌前驱补充道。好了氧化锌QD-decorated辐照二氧化钛NWs表现出显著增强光催化光解水制氢研究活动裸露的二氧化钛所在地和相比反应商业光催化剂P25。氢进化的最优样本tz - 0.6%双和获得的四倍裸露的二氧化钛NWs P25,分别。系统的光电特性,它可以得出的结论是,良好的光催化这些复合催化剂的性能归因于之间的合作heterojunction-induced有效界面电荷载体的迁移和尺度依赖的量子限制效应。

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