光催化
有色的
材料科学
纳米晶
X射线光电子能谱
空位缺陷
可见光谱
纳米技术
吸收(声学)
带隙
化学工程
无定形固体
价(化学)
光化学
光电子学
催化作用
有机化学
化学
结晶学
复合材料
工程类
生物化学
作者
Huaqiao Tan,Zhao Zhao,Mang Niu,Chengyu Mao,Dapeng Cao,Daojian Cheng,Pingyun Feng,Zaicheng Sun
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2014-01-01
卷期号:6 (17): 10216-10223
被引量:378
摘要
Colored TiO2 has attracted enormous attention due to its visible light absorption and excellent photocatalytic activity. In this report, we develop a simple and facile solid-state chemical reduction approach for a large-scale production of colored TiO2 at mild temperature (300-350 °C). The obtained sample possesses a crystalline core/amorphous shell structure (TiO2@TiO2-x). The oxygen vacancy results in the formation of a disordered TiO2-x shell on the surface of TiO2 nanocrystals. XPS and theoretical calculation results indicate that valence band tail and vacancy band below the conduction band minimum appear for the TiO2-x, which implies that the TiO2@TiO2-x nanocrystal has a narrow band gap and therefore leads to a broad visible light absorption. Oxygen vacancy in a proper concentration promotes the charge separation of photogenerated carriers, which improves the photocatalytic activity of TiO2@TiO2-x nanocrystals. This facile and general method could be potentially used for large scale production of colored TiO2 with remarkable enhancement in the visible light absorption and solar-driven H2 production.
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