Band-to-Band Visible-Light Photon Excitation and Photoactivity Induced by Homogeneous Nitrogen Doping in Layered Titanates
文献类型：期刊论文
| 作者 | G. Liu ; L. Z. Wang ; C. H. Sun ; X. X. Yan ; X. W. Wang ; Z. G. Chen ; S. C. Smith ; H. M. Cheng ; G. Q. Lu |
| 刊名 | Chemistry of Materials
 |
| 出版日期 | 2009 |
| 卷号 | 21期号:7页码:1266-1274 |
| 关键词 | doped titanium-dioxide sensitized solar-cells photocatalytic h-2 evolution tio2 photocatalysts photoelectrochemical properties mechanochemical reaction driven photocatalysts electronic-structure water oxidation tungsten-oxide |
| ISSN号 | 0897-4756 |
| 中文摘要 | The distribution of dopants in semiconductors can intrinsically determine the electronic structure and consequently the absorbance, redox potential, and charge-carrier mobility of the semiconductor photocatalysts. In contrast to most reported nitrogen-doped titania photocatalysts with some localized states in the intrinsic band gap and small visible light absorption shoulders induced by inhomogeneous nitrogen doping near the particle surface, we report here the homogeneous substitution of O by N in the whole particles of layered titanates. The resultant materials Cs(0.68)Ti(1.83)O(4-x)N(x) exhibited extraordinary band-to-band excitation in the visible-light ranging up to blue light. From photoelectron spectroscopy and first-principles calculations, the upward shift of valence band maximum by N 2p states is concluded as the cause of the band-to-band visible light excitation. The holes generated upon visible light excitation in the newly formed valence bands Of Cs(0.68)Ti(1.83)O(4-x)N(x) and H(0.68)Ti(1.83)O(4-x)N(x) had strong oxidation ability in oxidizing OH(-) into active center dot OH radicals in photocatalysis. These findings are the clear evidence for the substantial role of homogeneous nitrogen doping in obtaining band-to-band visible-light photon excitation in layered titanates. The new physical insights into the electronic structure of homogeneous substitutional N in layered titanates gained here may have important implications for developing other efficient visible light photocatalysts by nonmetal doping. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/32082]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | G. Liu,L. Z. Wang,C. H. Sun,et al. Band-to-Band Visible-Light Photon Excitation and Photoactivity Induced by Homogeneous Nitrogen Doping in Layered Titanates[J]. Chemistry of Materials,2009,21(7):1266-1274. |
| APA | G. Liu.,L. Z. Wang.,C. H. Sun.,X. X. Yan.,X. W. Wang.,...&G. Q. Lu.(2009).Band-to-Band Visible-Light Photon Excitation and Photoactivity Induced by Homogeneous Nitrogen Doping in Layered Titanates.Chemistry of Materials,21(7),1266-1274. |
| MLA | G. Liu,et al."Band-to-Band Visible-Light Photon Excitation and Photoactivity Induced by Homogeneous Nitrogen Doping in Layered Titanates".Chemistry of Materials 21.7(2009):1266-1274. |
入库方式： OAI收割
来源：金属研究所
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