Improving visible-light-driven photocatalytic NO oxidation over BiOBr nanoplates through tunable oxygen vacancies
Improving visible-light-driven photocatalytic NO oxidation over BiOBr nanoplates through tunable oxygen vacancies
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DOI：
10.1016/s1872-2067(18)63056-6
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发表时间：
2018-04-01
影响因子：
16.5
通讯作者：
Dong, Fan
中科院分区：
文献类型：
--
作者：
Liao, Jiazhen;Chen, Lvcun;Dong, Fan
在这项工作中，使用水/乙二醇溶液通过溶剂热法合成了一系列具有氧空位（OV）的BiOBr纳米片。通过改变水/乙二醇的比例来调节 BiOBr 的 OV 和面的数量。尽管人们已经研究了OV在光催化中的作用，但电荷转移和反应物活化的潜在机制仍然未知。为了揭示 OV 对反应物活化和光催化 NO 氧化过程的影响，进行了原位漫反射红外傅立叶变换光谱（即所谓的 DRIFTS）和理论计算，并将结果结合起来。通过增加 OV 的数量，所制备的 BiOBr 的光催化效率显着提高。氧空位对光催化剂有多种影响，包括引入中间能级，增强光吸收，促进电子转移，作为催化反应和氧分子活化的活性位点，促进中间产物向最终产物的转化，从而提高整体可见光光催化效率。目前的工作为理解OVs在光催化剂中的作用和光催化NO氧化机制提供了新的见解。 (C)2018，中国科学院大连化学物理研究所。由 Elsevier B.V. 出版。保留所有权利。
In this work, a series of BiOBr nanoplates with oxygen vacancies (OVs) were synthesized by a solvothermal method using a water/ethylene glycol solution. The number of OVs and facets of BiOBr were tuned by changing the water/ethylene glycol ratio. Although the role of OVs in photocatalysis has been investigated, the underlying mechanisms of charge transfer and reactant activation remain unknown. To unravel the effect of OVs on the reactant activation and photocatalytic NO oxidation process, in situ diffuse reflectance infrared Fourier transform spectroscopy, so-called DRIFTS, and theoretical calculations were performed and their results combined. The photocatalytic efficiency of the as-prepared BiOBr was significantly increased by increasing the amount of OVs. The oxygen vacancies had several effects on the photocatalysts, including the introduction of intermediate energy levels that enhanced light absorption, promoted electron transfer, acted as active sites for catalytic reaction and the activation of oxygen molecules, and facilitated the conversion of the intermediate products to the final product, thus increasing the overall visible light photocatalysis efficiency. The present work provides new insights into the understanding of the role of OVs in photocatalysts and the mechanism of photocatalytic NO oxidation. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.