Strongly coupled CdS/graphene quantum dots nanohybrids for highly efficient photocatalytic hydrogen evolution: Unraveling the essential roles of graphene quantum dots | |
Department | OSSO国家重点实验室 |
Lei, Yonggang1; Yang, Cheng1; Hou, Jianhua1; Wang, Fang1; Min SX(敏世雄)1; Ma, Xiaohua1; Jin ZL(靳治良)1; Xu, Jing1; Lu GX(吕功煊)2; Huang, Kuo-Wei3; Min SX(敏世雄) | |
2017 | |
Source Publication | Applied Catalysis B: Environmental |
ISSN | 0926-3373 |
Volume | 216Pages:59-69 |
Abstract | It have been recognized that the coupling of graphene quantum dots (GQDs) with semiconductor photocatalysts endow the resulting nanocomposites with enhanced photocatalytic performances, however, the essential roles of GQDs have not been clearly revealed yet. Herein, we report that a high efficiency of the photocatalytic H2 evolution was achieved using strongly coupled nanohybrids of CdS with GQDs (CdSIGQDs) as visible-light-driven photocatalysts. CdSIGQDs nanohybrids were synthesized by a facile hydrothermal method in which the crystallization of CdS precursor and coupling of GQDs could be accomplished in one-step. GQDs are firmly decorated on the surface of CdS nanoparticles, forming "dot on -particle" heterodimer structures. GQDs have no significant influence on the crystallite structure of CdS but render the nanohybrids with strong light absorption at the wavelength beyond the band edge of CdS. Under visible light irradiation (>420 nm), CdSIGQDs nanohybrids reach the highest H2 production rate of 95.4 μmol h-1, about 2.7 times higher than that of pure CdS nanoparticles, at GQDs content of 1.0 wt%, and the apparent quantum efficiency (AQE) was determined to be 4.2% at 420 nm. Incident light wavelength dependent experiments reveal that the light absorption of CdS dominated the performance of nanohybrids, and the excess light absorption coming from GQDs hardly contributes to the observed higher activity. Photocurrent response, steady-state and time-resolved PL, and EIS measurements suggest that the high activity of CdSIGQDs is attributed predominantly to the graphene-like nature of GQDs, which can act as an efficient electron acceptor to induce an efficient charge separation. This work clearly reveals that GQDs mainly played a role of electron acceptor instead of a photosensitizer in enhancing the photocatalytic H2 evolution performances of CdSIGQDs nanohybrids, which offers a new insight to understand the essential roles of GQDs in semiconductor/GQDs nanohybrids for efficient solar energy conversion applications. |
Keyword | Graphene Quantum Dots Cds Nanohybrids Photocatalysis H-2 Evolution |
Subject Area | 物理化学与绿色催化 |
DOI | 10.1016/j.apcatb.2017.05.063 |
Funding Organization | the National Science Foundation of China (21463001;41663012);Graduate student innovation project (YCX1778);the Natural Science Foundation of Ningxia Hui Autonomous Region (NZ15102);the Scientific Research Projects of the State Ethnic Affairs Commission (2066204);the Cultivation Project of National Natural Science Foundation of China (2014QZP04) |
Indexed By | SCI |
If | 9.446 |
Language | 英语 |
Funding Project | 环境催化与氢能研究组 |
compositor | 第二作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/21980 |
Collection | 羰基合成与选择氧化国家重点实验室(OSSO) |
Corresponding Author | Min SX(敏世雄) |
Affiliation | 1.Beifang Univ Nationalities, Sch Chem & Chem Engn, Yinchuan 750021, Ningxia Provinc, Peoples R China 2.Chinese Acad Sci, Lanzhou Inst Chem, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China 3.King Abdullah Univ Sci & Technol, KAUST Catalysis Ctr, Thuwal 239556900, Saudi Arabia |
Recommended Citation GB/T 7714 | Lei, Yonggang,Yang, Cheng,Hou, Jianhua,et al. Strongly coupled CdS/graphene quantum dots nanohybrids for highly efficient photocatalytic hydrogen evolution: Unraveling the essential roles of graphene quantum dots[J]. Applied Catalysis B: Environmental,2017,216:59-69. |
APA | Lei, Yonggang.,Yang, Cheng.,Hou, Jianhua.,Wang, Fang.,Min SX.,...&敏世雄.(2017).Strongly coupled CdS/graphene quantum dots nanohybrids for highly efficient photocatalytic hydrogen evolution: Unraveling the essential roles of graphene quantum dots.Applied Catalysis B: Environmental,216,59-69. |
MLA | Lei, Yonggang,et al."Strongly coupled CdS/graphene quantum dots nanohybrids for highly efficient photocatalytic hydrogen evolution: Unraveling the essential roles of graphene quantum dots".Applied Catalysis B: Environmental 216(2017):59-69. |
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