Formation of Bi2WO6 Bipyramids with Vacancy Pairs for Enhanced Solar‐Driven Photoactivity
Formation of Bi2WO6 Bipyramids with Vacancy Pairs for Enhanced Solar‐Driven Photoactivity
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DOI：
10.1002/adfm.201501009
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发表时间：
2015-06
影响因子：
19
通讯作者：
Gong Zhang;Ziyu Hu;Meng Sun;Yang Liu;Li‐Min Liu;Huijuan Liu;C. Huang;J. Qu;Jinghong Li
中科院分区：
文献类型：
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作者：
Gong Zhang;Ziyu Hu;Meng Sun;Yang Liu;Li‐Min Liu;Huijuan Liu;C. Huang;J. Qu;Jinghong Li
为了提高光活性，许多尝试集中在增加晶体上高反应性表面的暴露。然而，反应表面和增强之间的联系仍然难以捉摸。在此，通过溶剂热法制备了具有大部分{100}面的Bi2WO6纳米结构双锥体。 {100}高能面上“Bi-O”二聚体空位对的形成导致带隙减小和光激发载流子复合减少，这一点已被正电子湮灭能谱（PAS）、X射线光电子能谱（XPS）和理论计算明确证实。电子-空穴对的有效分离和窄带隙显着提高了 Bi2WO6 纳米双锥体的光活性，特别是在太阳光照射下。这些发现可广泛应用于节能且坚固的催化剂的设计和制造。
In order to improve the photoactivity, many attempts have focused on increasing the exposure of highly reactive surfaces on crystals. However, the connection between the reactive surfaces and enhancement is still elusive. Herein, Bi2WO6 nanostructured bipyramids with a large fraction of {100} facets are fabricated by the solvothermal method. The formation of “Bi–O” dimer vacancy pairs on the {100} high‐energy facets is responsible for the reduction in band gap and the decrease in the recombination of photo‐excited charge carriers, which is unambiguously confirmed by the positron annihilation spectra (PAS), X‐ray photoelectron spectrum (XPS), and theoretical calculations. The effective separation of electron–hole pairs and the narrowing bandgap significantly improve the photoactivity of Bi2WO6 nanobipyramids, especially under solar light irradiation. These findings can be applied broadly to the design and fabrication of energy efficient and robust catalysts.