Formation of Bi2WO6 Bipyramids with Vacancy Pairs for Enhanced Solar‐Driven Photoactivity,Advanced Functional Materials

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Formation of Bi2WO6 Bipyramids with Vacancy Pairs for Enhanced Solar‐Driven Photoactivity
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2015-05-13 , DOI: 10.1002/adfm.201501009
Gong Zhang _{1,

2} , Ziyu Hu ₃ , Meng Sun _{1,

2} , Yang Liu ₄ , Limin Liu ₃ , Huijuan Liu ₁ , Chin-Pao Huang ₅ , Jiuhui Qu ₁ , Jinghong Li ₄

Affiliation

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.

中文翻译：

具有空位对的Bi2WO6双锥体的形成可增强太阳光驱动的光活性

为了提高光活性，许多尝试集中在增加高反应性表面在晶体上的曝光。但是，反应性表面和增强层之间的连接仍然难以捉摸。在此，Bi ₂ WO ₆通过溶剂热法制备了{100}晶面很大一部分的纳米结构双锥体。{100}高能刻面上“ Bi-O”二聚体空位对的形成负责带隙的减小和光激发电荷载流子复合的减少，正电子an没谱清楚地证实了这一点。（PAS），X射线光电子能谱（XPS）和理论计算。电子-空穴对和窄带隙的有效分离显着改善了Bi ₂ WO ₆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高效的催化剂的设计和制造。

更新日期：2015-05-13

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