Tuning the Relative Concentration Ratio of Bulk Defects to Surface Defects in TiO2 Nanocrystals Leads to High Photocatalytic Efficiency
Tuning the Relative Concentration Ratio of Bulk Defects to Surface Defects in TiO2 Nanocrystals Leads to High Photocatalytic Efficiency
复制标题
调节 TiO2 纳米晶体中体相缺陷与表面缺陷的相对浓度比可实现高光催化效率
DOI：
10.1021/ja207826q
复制
发表时间：
2011-10-19
影响因子：
15
通讯作者：
Zhao, Xiujian
中科院分区：
文献类型：
--
作者：
Kong, Ming;Li, Yuanzhi;Zhao, Xiujian
合成了具有可调体/表面缺陷的二氧化钛纳米晶，并用透射电子显微镜、X射线衍射仪、比表面积法、正电子湮没和光电流法对其进行了表征。研究了缺陷对光催化活性的影响。首次发现，减小体缺陷与表面缺陷的相对浓度比可以显著提高光生电子和空穴的分离效率，从而显著提高光催化效率。
TiO2 nanocrystals with tunable bulk/surface defects were synthesized and characterized with TEM, XRD, BET, positron annihilation, and photocurrent measurements. The effect of defects on photocatalytic activity was studied. It was found for the first time that decreasing the relative concentration ratio of bulk defects to surface defects in TiO2 nanocrystals could significantly improve the separation efficiency of photogenerated electrons and holes, thus significantly enhancing the photocatalytic efficiency.