ZnO/BiOI Heterostructures: Photoinduced Charge-Transfer Property and Enhanced Visible-Light Photocatalytic Activity
ZnO/BiOI Heterostructures: Photoinduced Charge-Transfer Property and Enhanced Visible-Light Photocatalytic Activity
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ZnO/BiOI异质结构：光诱导电荷转移特性和增强的可见光光催化活性
DOI：
10.1021/jp205925z
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发表时间：
2011-10-27
影响因子：
3.7
通讯作者：
Zhang, Lizhi
中科院分区：
文献类型：
--
作者：
Jiang, Jing;Zhang, Xi;Zhang, Lizhi
本文采用化学浴法在低温下制备了ZnO/BiOI异质结。ZnO/BiOI异质结构的形态和成分的控制是通过简单地调整Bi/Zn摩尔比来实现的。所得ZnO/BiOI异质结构在可见光照射下对甲基橙橙子的降解表现出很高的光催化活性。ZnO/BiOI异质结构的高光催化活性首先归因于它们的高表面积。表面光电压谱和瞬态光电压测量结果表明，p型BiOI与n型ZnO的耦合可以显著提高其光生电荷转移性能。ZnO/BiOI界面处的异质结可以有效地减少光生电子空穴对的复合，使载流子寿命提高15倍，从而提高ZnO/BiOI异质结构的光催化活性，除了高表面积之外，这项研究表明，两种不同半导体之间的异质结构结构在决定动态特性方面起着非常重要的作用。光生载流子的性质和光催化性能。
In this study, ZnO/BiOI heterostructures were synthesized by a facile chemical bath method at low temperature. Control of the morphology and constituents of the ZnO/BiOI heterostructures was realized by simply tuning the Bi/Zn molar ratios. The resulting ZnO/BiOI heterostructures exhibited high photocatalytic activity in the degradation of methyl orange under visible-light irradiation. The high photocatalytic activity of the ZnO/BiOI heterostructures was first attributed to their high surface area. Surface photovoltage spectroscopy and transient photovoltage measurements revealed that the photoinduced charge-transfer property of p-type BiOI could be improved greatly by coupling with n-type ZnO. The heterojunction at the interface between the BiOI and ZnO could efficiently reduce the recombination of photoinduced electron hole pairs to increase the lifetime of charge carriers by 15 times and thus enhance the photocatalytic activity of the ZnO/BiOI heterostructures, in addition to the high surface area This study reveals that the heterostructure construction between two different semiconductors plays a very important role in determining the dynamic properties of their photogenerated charge carriers and their photocatalytic propertis.