Photocatalytic activity of Ti3+ self-doped dark TiO2 ultrafine nanorods, grey SiO2 nanotwin crystalline, and their composite under visible light
Photocatalytic activity of Ti3+ self-doped dark TiO2 ultrafine nanorods, grey SiO2 nanotwin crystalline, and their composite under visible light
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DOI：
10.1088/2053-1591/aabde0
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发表时间：
2018-04
影响因子：
2.3
通讯作者：
Renhui Zhang;Yingchang Yang;S. Leng;Qing Wang
中科院分区：
文献类型：
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作者：
Renhui Zhang;Yingchang Yang;S. Leng;Qing Wang
有效的电子空穴分离是提高光催化活性的关键。本文合成了深色TiO2 （D-TiO2）纳米棒、灰色SiO2 （G-SiO2）纳米棒和带有表面缺陷的D-TiO2/G-SiO2复合材料。我们报道了通过在D-TiO2晶格中引入G-SiO2，光生电子和空穴分离的效率得到了很好的提高。利用第一性原理方法，我们发现表面缺陷（O或Si空位）有利于提高可见光区的光吸收。结合实验结果，对于D-TiO2/G-SiO2复合材料，TiO2纳米晶的表面缺陷可以显著提高光催化效率。
Efficient electron-holes separation is of crucial importance for the improvement of photocatalytic activity for photocatalytic reaction. In this work, dark TiO2 (D-TiO2) nanorods, grey SiO2 (G-SiO2) and D-TiO2/G-SiO2 composite with surface defects are synthesized. We report that the efficiency of photo-generated electrons and holes separation is well enhanced by introducing G-SiO2 into D-TiO2 lattice. Using first-principles method, we find that surface defects (O or Si vacancy) can be conducive to improving the optical absorption under visible-light region. Combination of the experimental results, for D-TiO2/G-SiO2 composite, the surface defects of TiO2 nanocrystallines can significantly improve the photocatalytic efficiency.