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题名: Time-resolved photoluminescence of anatase/rutile TiO2 phase junction revealing charge separation dynamics
作者: Wang, Xiuli1;  Shen, Shuai1;  Feng, Zhaochi1;  Li, Can1
关键词: Titanium dioxide (TiO2) ;  Anatase/rutile phase junction ;  Charge separation ;  Charge recombination ;  Time-resolved photoluminescence
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2016-12-01
DOI: 10.1016/S1872-2067(16)62574-3
卷: 37, 期:12, 页:2059-2068
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Junctions are an important structure that allows charge separation in solar cells and photocatalysts. Here, we studied the charge transfer at an anatase/rutile TiO2 phase junction using time-resolved photoluminescence spectroscopy. Visible (similar to 500 nm) and near-infrared (NIR, similar to 830 nm) emissions were monitored to give insight into the photoinduced charges of anatase and rutile in the junction, respectively. New fast photoluminescence decay components appeared in the visible emission of rutile-phase dominated TiO2 and in the NIR emission of many mixed phase TiO2 samples. The fast decays confirmed that the charge separation occurred at the phase junction. The visible emission intensity from the mixed phase TiO2 increased, revealing that charge transfer from rutile to anatase was the main pathway. The charge separation slowed the microsecond time scale photoluminescence decay rate for charge carriers in both anatase and rutile. However, the millisecond decay of the charge carriers in anatase TiO2 was accelerated, while there was almost no change in the charge carrier dynamics of rutile TiO2. Thus, charge separation at the anatase/rutile phase junction caused an increase in the charge carrier concentration on a microsecond time scale, because of slower electron-hole recombination. The enhanced photocatalytic activity previously observed at anatase/rutile phase junctions is likely caused by the improved charge carrier dynamics we report here. These findings may contribute to the development of improved photocatalytic materials. (C) 2016, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
关键词[WOS]: TRANSIENT ABSORPTION-SPECTROSCOPY ;  PHOTOINDUCED ELECTRON-TRANSFER ;  PHOTOCATALYTIC ACTIVITY ;  BAND ALIGNMENT ;  RUTILE TIO2 ;  SURFACE ;  NANOPARTICLES ;  HYDROGEN ;  WATER ;  BULK
语种: 英语
WOS记录号: WOS:000391777500003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/151869
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Wang, Xiuli,Shen, Shuai,Feng, Zhaochi,et al. Time-resolved photoluminescence of anatase/rutile TiO2 phase junction revealing charge separation dynamics[J]. CHINESE JOURNAL OF CATALYSIS,2016,37(12):2059-2068.
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