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题名: Charge-Transfer Dynamics Promoted by Hole Trap States in CdSe Quantum Dots-Ni2+ Photocatalytic System
作者: Ye, Yun1, 2;  Wang, Xiuli1;  Ye, Sheng1;  Xu, Yuxing1, 2;  Feng, Zhaochi1;  Li, Can1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2017-08-17
DOI: 10.1021/acs.jpcc.7b05061
卷: 121, 期:32, 页:17112-17120
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Manipulation of the photoinduced hole dynamics is a key strategy to improve the H-2 evolution efficiency in quantum dots (QDs)-based photocatalytic systems. The ultrafast hole trapping by surface states of the QDs is beneficial to electron transfer but retards the trapped hole transfer. Whether ultrafast hole trapping is beneficial to the photo catalytic H2 evolution activity deserves to be investigated. We employed two types of CdSe QDs, QDs-1 and QDs-2, with tuned surface hole trap states to investigate the effect of ultrafast hole trapping on charge-transfer dynamics in the photocatalytic system. QDs-1 possesses higher density of surface hole trap states than QDs-2. Compared with QDs-2, the transfer dynamics of free electrons in QDs-1 to the proton reduction catalyst, Ni-2, is more promoted by hole trapping, characterized by the transient absorption spectroscopy and photoluminescence techniques. Interestingly, the free hole transfer from QDs-1 to the sacrificial reagent, ascorbic acid (AA), was also improved more. Moreover, the surface defects of the QDs serve as binding sites for Ni2+ and AA, further promoting the electron transfer and hole removal dynamics, respectively. Our results illustrate that the ultrafast hole trapping increases the H2 production activity in the actual CdSe QDs Ni2+ photocatalytic system.
关键词[WOS]: ULTRAFAST ELECTRON-TRANSFER ;  SEMICONDUCTOR NANOCRYSTALS ;  SURFACE-CHEMISTRY ;  NANOROD HETEROSTRUCTURES ;  CARRIER DYNAMICS ;  METHYLENE-BLUE ;  H-2 GENERATION ;  DOTS ;  PHOTOLUMINESCENCE ;  SEPARATION
语种: 英语
WOS记录号: WOS:000408179500010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150005
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 Natl Lab Clean Energy, State Key Lab Catalysis, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Ye, Yun,Wang, Xiuli,Ye, Sheng,et al. Charge-Transfer Dynamics Promoted by Hole Trap States in CdSe Quantum Dots-Ni2+ Photocatalytic System[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2017,121(32):17112-17120.
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