金红石
二氧化钛
光催化
材料科学
分解水
可见光谱
载流子
半导体
纳米颗粒
带隙
兴奋剂
钛
纳米技术
氢
价(化学)
化学工程
光电子学
光化学
化学
催化作用
复合材料
冶金
有机化学
工程类
生物化学
作者
Landong Li,Junqing Yan,Tuo Wang,Zhi‐Jian Zhao,Jian Zhang,Jinlong Gong,Naijia Guan
摘要
Titanium dioxide is a promising photocatalyst for water splitting, but it suffers from low visible light activity due to its wide band gap. Doping can narrow the band gap of titanium dioxide; however, new charge-carrier recombination centres may be introduced. Here we report the design of sub-10 nm rutile titanium dioxide nanoparticles, with an increased amount of surface/sub-surface defects to overcome the negative effects from bulk defects. Abundant defects can not only shift the top of the valence band of rutile titanium dioxide upwards for band-gap narrowing but also promote charge-carrier separation. The role of titanium(III) is to enhance, rather than initiate, the visible-light-driven water splitting. The sub-10 nm rutile nanoparticles exhibit the state-of-the-art activity among titanium dioxide-based semiconductors for visible-light-driven water splitting and the concept of ultra-small nanoparticles with abundant defects may be extended to the design of other robust semiconductor photocatalysts.
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