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题名: Substitution Boosts Charge Separation for High Solar-Driven Photocatalytic Performance
作者: Zhang, Gong; Zhang, Le; Liu, Yang; Liu, Limin; Huang, Chin-Pao; Liu, Huijuan; Li, Jinghong
刊名: ACS APPLIED MATERIALS & INTERFACES
出版日期: 2016-10-12
卷号: 8, 期号:40, 页码:26783-26793
关键词: BiOBr ; iodine ; substitution ; vacancy ; photoactivity
DOI: 10.1021/acsami.6b08676
部门归属: 环境水质学国家重点实验室
英文摘要: Bandgap engineering of photocatalysts is a common approach to achieving high effective utilization of solar resource. However, the difficulty in achieving bandgap narrowing and high activity simultaneously seems to be irreconcilable via the traditional modification pathway. Herein, we have substituted iodine for a fraction of bromine atoms in BiOBr to overcome this restriction and provided some deep-seated insights into how the substitution boosts the photocatalytic properties. The substituted BiOBr0.75I0.25 exhibited exceptional photoactivity, with photon-to-current conversion efficiency approximately 6 times greater than TiO2 in UV region, and more than 10 times higher than BiOBr or BiOI in visible-light region. We found that the substitution narrowed the bandgap, facilitated the diffusion of electron with small effective mass, as well as induced oxygen vacancies on [Bi2O2](2+) layers. By virtue of the stronger dipole moments produced, the enhancement of intrinsic electric fields between [Bi2O2](2+) and halogen slabs was achieved in BiOBr0.75I0.25; thereby the distance the photogenerated electron could diffuse was sufficient to inhibit the recombination. Out findings not only shed light on the potential properties of hybrid-halide photocatalysts but also provide a Strategy for developing high efficiency catalysts.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36079
Appears in Collections:环境水质学国家重点实验室_期刊论文

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