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Electron-transfer cascade from CdSe@ZnSe core-shell quantum dot accelerates photoelectrochemical H2 evolution on TiO2 nanotube arrays
Jia, Jia1; Xue, Peng1; Hu, Xiaoyun2; Wang, Yishan3; Liu, Enzhou1,2; Fan, Jun1
Department瞬态光学技术国家重点实验室
2019-07
Source PublicationJournal of Catalysis
ISSN00219517;10902694
Pages81-94
Contribution Rank3
Abstract

A novel TiO2-CdSe-ZnSe electron-transfer cascade heterostructure with nanoscale precision is synthesized for hydrogen evolution, exhibiting an obvious hierarchical absorption and improved separation efficiency for photocarriers. The key to this constructed structure lies in the in-situ deposition of CdSe quantum-dots onto the surface of TiO2 followed by the epitaxial growth of a ZnSe shell. In this conditions, the CdSe core can serve as a buffer layer for the electrons on the conduction band of the ZnSe shell, enabling them to rapidly migrate to the TiO2 and later to the opposite electrode to produce H2; meanwhile, due to high injection efficiency in the cascade type II structure, holes from TiO2 are transferred to the electrolyte interface, where the oxidation reaction of hole trapping scavenger occurs. Surprisingly, this heterostructure shows a significantly enhanced photocurrent density (1.45 mA cm−2), favorable H2 production rates (252 μmol h−1 cm−2) and moderate durability under light irradiation. © 2019 Elsevier Inc.

KeywordPhotoelectrochemical H-2 evolution Quantum dots CdSe@ZnSe core-shell TiO2 nanotube arrays
DOI10.1016/j.jcat.2019.05.028
Indexed BySCI ; EI
Language英语
WOS IDWOS:000486104500009
PublisherAcademic Press Inc.
EI Accession Number20192407025900
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.opt.ac.cn/handle/181661/31555
Collection瞬态光学技术国家重点实验室
Corresponding AuthorLiu, Enzhou
Affiliation1.School of Chemical Engineering, Northwest University, Xi'an; 710069, China;
2.School of Physics, Northwest University, Xi'an; 710069, China;
3.State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China
Recommended Citation
GB/T 7714
Jia, Jia,Xue, Peng,Hu, Xiaoyun,et al. Electron-transfer cascade from CdSe@ZnSe core-shell quantum dot accelerates photoelectrochemical H2 evolution on TiO2 nanotube arrays[J]. Journal of Catalysis,2019:81-94.
APA Jia, Jia,Xue, Peng,Hu, Xiaoyun,Wang, Yishan,Liu, Enzhou,&Fan, Jun.(2019).Electron-transfer cascade from CdSe@ZnSe core-shell quantum dot accelerates photoelectrochemical H2 evolution on TiO2 nanotube arrays.Journal of Catalysis,81-94.
MLA Jia, Jia,et al."Electron-transfer cascade from CdSe@ZnSe core-shell quantum dot accelerates photoelectrochemical H2 evolution on TiO2 nanotube arrays".Journal of Catalysis (2019):81-94.
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