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Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy
Ye, Yun1,2; Xu, Yuxing1,2; Huang, Lei1; Fan, Dayong1,2; Feng, Zhaochi1; Wang, Xiuli1; Li, Can1
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
2016-07-14
ISSN1463-9076
DOI10.1039/c6cp02808j
Volume18Issue:26Pages:17389-17397
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS Research AreaChemistry ; Physics
WOS KeywordPHOTOCATALYTIC H-2 PRODUCTION ; CADMIUM-SULFIDE PARTICLES ; SEMICONDUCTOR NANOCRYSTALS ; HYDROGEN EVOLUTION ; OPTICAL-PROPERTIES ; CHARGE SEPARATION ; SURFACE-CHEMISTRY ; LIGHT HARVESTERS ; II-VI ; COMPLEXES
AbstractElectron transfer from CdS quantum dots (QDs) to cobaloxime (Co(dmgH)(2)pyCl) is demonstrated by transient absorption spectroscopy (TAS), and further confirmed using photoluminescence (PL) techniques. The analysis of the PL quenching results offers a novel way to understand the roles of the surface adsorption sites of CdS QDs in the performance of charge transfer in the CdS QDs-cobaloxime hybrid system. Two types of quenching dynamics reveal that there are two different adsorption modes of cobaloxime on the CdS QD surface. When cobaloxime substitutes the surface capping ligands of CdS QDs under low cobaloxime concentrations, the transfer is nearly unfavorable for both the free and trapped electrons. When cobaloxime occupies the surface defect sites of the CdS QDs under high cobaloxime concentrations, the transfer of both the free and trapped electrons is very effective, with an extremely high quenching rate constant of similar to 10(12) M-1 s(-1). Therefore, controlling the molecular adsorption sites and adjusting the surface defect properties of semiconductor QDs provide a strategy to improve the electron transfer efficiency of the QDs-cobaloxime photocatalytic system.
Language英语
WOS IDWOS:000379482100034
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/170427
Collection中国科学院大连化学物理研究所
Corresponding AuthorWang, Xiuli; Li, Can
Affiliation1.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Ye, Yun,Xu, Yuxing,Huang, Lei,et al. Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2016,18(26):17389-17397.
APA Ye, Yun.,Xu, Yuxing.,Huang, Lei.,Fan, Dayong.,Feng, Zhaochi.,...&Li, Can.(2016).Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,18(26),17389-17397.
MLA Ye, Yun,et al."Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 18.26(2016):17389-17397.
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