Radical macro spatial separation: a novel way to enhance the photocatalytic efficiency
Radical macro spatial separation: a novel way to enhance the photocatalytic efficiency
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DOI：
10.1039/c5ra00882d
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发表时间：
2015-03
期刊：
影响因子：
3.9
通讯作者：
Fengpo Yan;Jinsheng Zheng;Xiaogang Xue;Jiye Zhang;F. Huang;Y. Qiu
中科院分区：
文献类型：
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作者：
Fengpo Yan;Jinsheng Zheng;Xiaogang Xue;Jiye Zhang;F. Huang;Y. Qiu
激进的宏观空间分离可以通过一种新的光催化系统来实现，该系统将电子和空穴分离到两个由盐桥连接的反应室中。该体系以ZnO单晶为光催化剂，罗丹明B为模式污染物。作为一种极化单晶，ZnO可以分离光生电子和空穴，也可以分离两种光生载流子产生的自由基。在没有直接照射的情况下，在与O极平面接触的腔室中只发现˙OH。这表明我们的系统实现了传统光催化系统无法实现的彻底的空间分离，从而获得了更高的光催化效率。在ZnO单晶中发现了自发极化电场诱导的晶面选择性光腐蚀，这将有助于设计更高效、更耐腐蚀的ZnO基光催化材料。
Radical macro spatial separation can be achieved via a new photocatalytic system separating electrons and holes into two reaction chambers which are connected by a salt bridge. In this system, ZnO single crystal was selected as a photocatalyst and Rhodamine B was employed as model pollutant. As a polarized single crystal, ZnO can separate photogenerated electrons and holes, as well as the radicals generated by two kinds of photogenerated carriers. Without direct irradiation, only ˙OH is found in the chamber that was in contact with the O polar plane. It shows that our system achieves a radical spatial separation which cannot be achieved in conventional photocatalytic systems, and thereby obtains higher photocatalytic efficiency. Spontaneous polarization electric field induced crystal plane selective photocorrosion in the ZnO single crystal is also found, which will help to design more efficient and more corrosion-resistant ZnO-based photocatalytic materials.