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Alam KM, Jensen CE, Kumar P, Hooper RW, Bernard GM, Patidar A, Manuel AP, Amer N, Palmgren A, Purschke DN, Chaulagain N, Garcia J, Kirwin PS, Shoute LCT, Cui K, Gusarov S, Kobryn AE, Michaelis VK, Hegmann FA, Shankar K. Photocatalytic Mechanism Control and Study of Carrier Dynamics in CdS@C 3N 5 Core-Shell Nanowires. ACS APPLIED MATERIALS & INTERFACES 2021; 13:47418-47439. [PMID: 34608803 DOI: 10.1021/acsami.1c08550] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We present a potential solution to the problem of extraction of photogenerated holes from CdS nanocrystals and nanowires. The nanosheet form of C3N5 is a low-band-gap (Eg = 2.03 eV), azo-linked graphenic carbon nitride framework formed by the polymerization of melem hydrazine (MHP). C3N5 nanosheets were either wrapped around CdS nanorods (NRs) following the synthesis of pristine chalcogenide or intercalated among them by an in situ synthesis protocol to form two kinds of heterostructures, CdS-MHP and CdS-MHPINS, respectively. CdS-MHP improved the photocatalytic degradation rate of 4-nitrophenol by nearly an order of magnitude in comparison to bare CdS NRs. CdS-MHP also enhanced the sunlight-driven photocatalytic activity of bare CdS NWs for the decolorization of rhodamine B (RhB) by a remarkable 300% through the improved extraction and utilization of photogenerated holes due to surface passivation. More interestingly, CdS-MHP provided reaction pathway control over RhB degradation. In the absence of scavengers, CdS-MHP degraded RhB through the N-deethylation pathway. When either hole scavenger or electron scavenger was added to the RhB solution, the photocatalytic activity of CdS-MHP remained mostly unchanged, while the degradation mechanism shifted to the chromophore cleavage (cycloreversion) pathway. We investigated the optoelectronic properties of CdS-C3N5 heterojunctions using density functional theory (DFT) simulations, finite difference time domain (FDTD) simulations, time-resolved terahertz spectroscopy (TRTS), and photoconductivity measurements. TRTS indicated high carrier mobilities >450 cm2 V-1 s-1 and carrier relaxation times >60 ps for CdS-MHP, while CdS-MHPINS exhibited much lower mobilities <150 cm2 V-1 s-1 and short carrier relaxation times <20 ps. Hysteresis in the photoconductive J-V characteristics of CdS NWs disappeared in CdS-MHP, confirming surface passivation. Dispersion-corrected DFT simulations indicated a delocalized HOMO and a LUMO localized on C3N5 in CdS-MHP. C3N5, with its extended π-conjugation and low band gap, can function as a shuttle to extract carriers and excitons in nanostructured heterojunctions, and enhance performance in optoelectronic devices. Our results demonstrate how carrier dynamics in core-shell heterostructures can be manipulated to achieve control over the reaction mechanism in photocatalysis.
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Affiliation(s)
- Kazi M Alam
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
- Nanotechnology Research Centre, National Research Council Canada, Edmonton, Alberta T6G 2M9, Canada
| | - Charles E Jensen
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Pawan Kumar
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Riley W Hooper
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Guy M Bernard
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Aakash Patidar
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Ajay P Manuel
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Naaman Amer
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Anders Palmgren
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - David N Purschke
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Narendra Chaulagain
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - John Garcia
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Phillip S Kirwin
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Lian C T Shoute
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Kai Cui
- Nanotechnology Research Centre, National Research Council Canada, Edmonton, Alberta T6G 2M9, Canada
| | - Sergey Gusarov
- Nanotechnology Research Centre, National Research Council Canada, Edmonton, Alberta T6G 2M9, Canada
| | - Alexander E Kobryn
- Nanotechnology Research Centre, National Research Council Canada, Edmonton, Alberta T6G 2M9, Canada
| | - Vladimir K Michaelis
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Frank A Hegmann
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Karthik Shankar
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
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Effective charge separation through the sulfur vacancy interfacial in n-CdO/p-CdS bulk heterojunction particle and its solar-induced hydrogen production. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.07.049] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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3
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Kamruzzaman M. The effect of ZnO/ZnSe core/shell nanorod arrays photoelectrodes on PbS quantum dot sensitized solar cell performance. NANOSCALE ADVANCES 2020; 2:286-295. [PMID: 36133990 PMCID: PMC9416973 DOI: 10.1039/c9na00523d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 11/13/2019] [Indexed: 06/16/2023]
Abstract
ZnO nanorod (NR) based inorganic quantum dot sensitized solar cells have gained tremendous attention for use in next generation solar cells. ZnO/ZnSe-core/shell NR arrays (NRAs) with various densities were grown on an Au@ZnO seed layer (Au = 0.0, 4.0, 8.0 and 16.0 nm) on glass supported fluorine-doped tin oxide (FTO) substrates using low cost hydrothermal and ion-exchange approaches. PbS quantum dots (QDs) were loaded into the ZnO/ZnSe core/shell NRAs via a successive ionic layer adsorption and reaction (SILAR) method. The morphology, structural and optical properties of the core/shell NRAs were investigated using field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-vis spectroscopy measurements. It was observed that the density of the ZnO/ZnSe NRAs decreases with increasing Au buffer layer thickness. The absorption decreases along with a decrease in the ZnO/ZnSe NRA density. The ZnO NRs/PbS QD photoelectrode performs poorly; however, after introducing a ZnSe shell on the core-ZnO, the solar cells parameters changed according to the ZnO/ZnSe NRA density. Values of η = ∼0.88%, J SC = 14.60 mA cm-2, and V OC = 190 mV, and η = ∼0.25%, J SC = 6.77 mA cm-2, and V OC = 115 mV were obtained for the highest and lowest NRA densities, respectively. Although the photovoltaic performance of these photoelectrodes is still inferior, further improvement of the device would be possible by suppressing surface defects, and through quality optimization of the ZnO/ZnSe NRAs, PbS QDs, counter electrode and electrolyte.
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Affiliation(s)
- M Kamruzzaman
- Department of Physics, Begum Rokeya University, Rangpur Rangpur-5400 Bangladesh +880-1771034439
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Feng HP, Tang L, Zeng GM, Zhou Y, Deng YC, Ren X, Song B, Liang C, Wei MY, Yu JF. Core-shell nanomaterials: Applications in energy storage and conversion. Adv Colloid Interface Sci 2019; 267:26-46. [PMID: 30884358 DOI: 10.1016/j.cis.2019.03.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 01/27/2019] [Accepted: 03/04/2019] [Indexed: 12/18/2022]
Abstract
Materials with core-shell structures have attracted increasing attention in recent years due to their unique properties and wide applications in energy storage and conversion systems. Through reasonable adjustments of their shells and cores, various types of core-shell structured materials can be fabricated with favorable properties that play significant roles in energy storage and conversion processes. The core-shell material can provide an effective solution to the current energy crisis. Various synthetic strategies used to fabricate core-shell materials, including the atomic layer deposition, chemical vapor deposition and solvothermal method, are briefly mentioned here. A state-of-the -art review of their applications in energy storage and conversion is summarized. The involved energy storage includes supercapacitors, li-ions batteries and hydrogen storage, and the corresponding energy conversion technologies contain quantum dot solar cells, dye-sensitized solar cells, silicon/organic solar cells and fuel cells. In addition, the correlation between the core-shell structures and their performance in energy storage and conversion is introduced, and this finding can provide guidance in designing original core-shell structures with advanced properties.
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Xu Y, Wang X, Zhang WL, Lv F, Guo S. Recent progress in two-dimensional inorganic quantum dots. Chem Soc Rev 2018; 47:586-625. [DOI: 10.1039/c7cs00500h] [Citation(s) in RCA: 181] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This review critically summarizes recent progress in the categories, synthetic routes, properties, functionalization and applications of 2D materials-based quantum dots (QDs).
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Affiliation(s)
- Yuanhong Xu
- College of Life Sciences
- Laboratory of Fiber Materials and Modern Textiles
- the Growing Base for State Key Laboratory
- Qingdao University
- Qingdao 266071
| | - Xiaoxia Wang
- College of Life Sciences
- Laboratory of Fiber Materials and Modern Textiles
- the Growing Base for State Key Laboratory
- Qingdao University
- Qingdao 266071
| | - Wen Ling Zhang
- College of Life Sciences
- Laboratory of Fiber Materials and Modern Textiles
- the Growing Base for State Key Laboratory
- Qingdao University
- Qingdao 266071
| | - Fan Lv
- Department of Materials Science and Engineering
- College of Engineering
- Peking University
- Beijing 100871
- China
| | - Shaojun Guo
- Department of Materials Science and Engineering
- College of Engineering
- Peking University
- Beijing 100871
- China
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Clark PCJ, Radtke H, Pengpad A, Williamson AI, Spencer BF, Hardman SJO, Leontiadou MA, Neo DCJ, Fairclough SM, Watt AAR, Pis I, Nappini S, Bondino F, Magnano E, Handrup K, Schulte K, Silly MG, Sirotti F, Flavell WR. The passivating effect of cadmium in PbS/CdS colloidal quantum dots probed by nm-scale depth profiling. NANOSCALE 2017; 9:6056-6067. [PMID: 28443889 DOI: 10.1039/c7nr00672a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Achieving control of the surface chemistry of colloidal quantum dots (CQDs) is essential to fully exploit their properties in solar cells, but direct measurement of the chemistry and electronic structure in the outermost atomic layers is challenging. Here we probe the surface oxidation and passivation of cation-exchanged PbS/CdS core/shell CQDs with sub nm-scale precision using synchrotron-radiation-excited depth-profiling photoemission. We investigate the surface composition of the topmost 1-2.5 nm of the CQDs as a function of depth, for CQDs of varying CdS shell thickness, and examine how the surface changes after prolonged air exposure. We demonstrate that the Cd is localized at the surface of the CQDs. The surface-localized products of oxidation are identified, and the extent of oxidation quantified. We show that oxidised sulfur species are progressively eliminated as Cd replaces Pb at the surface. A sub-monolayer surface 'decoration' of Cd is found to be effective in passivating the CQDs. We show that the measured energy-level alignments at PbS/CdS colloidal quantum dot surfaces differ from those expected on the basis of bulk band offsets, and are strongly affected by the oxidation products. We develop a model for the passivating action of Cd. The optimum shell thickness (of around 0.1 nm, previously found to give maximised power conversion efficiency in PbS/CdS solar cells) is found to correspond to a trade-off between the rate of oxidation and the introduction of a surface barrier to charge transport.
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Affiliation(s)
- Pip C J Clark
- School of Physics and Astronomy and the Photon Science Institute, The University of Manchester, Manchester M13 9PL, UK.
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7
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Mohammadpour A, Wiltshire BD, Zhang Y, Farsinezhad S, Askar AM, Kisslinger R, Ren Y, Kar P, Shankar K. 100-fold improvement in carrier drift mobilities in alkanephosphonate-passivated monocrystalline TiO 2 nanowire arrays. NANOTECHNOLOGY 2017; 28:144001. [PMID: 28273048 DOI: 10.1088/1361-6528/aa628e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Single crystal rutile titania nanowires grown by solvothermal synthesis are actively being researched for use as electron transporting scaffolds in perovskite solar cells, in low detection limit ultraviolet photodetectors, in photoelectrochemical water-splitting, and in chemiresistive and electrochemical sensing. The electron drift mobility (μ n ) in solution-grown TiO2 nanowires is very low due to a high density of deep traps, and reduces performance in optoelectronic devices. In this study, the effects of molecular passivation of the nanowire surface by octadecylphosphonic acid (ODPA), on carrier transport in TiO2 nanowire ensembles, were investigated using transient space charge limited current measurements. Infrared spectroscopy indicated the formation of a highly ordered phosphonate monolayer with a high likelihood of bidentate binding of ODPA to the rutile surface. We report the hole drift mobility (μ p ) for the first time in unpassivated solvothermal rutile nanowires to be 8.2 × 10-5 cm2 V-1 s-1 and the use of ODPA passivation resulted in μ p improving by nearly two orders of magnitude to 7.1 × 10-3 cm2 V-1 s-1. Likewise, ODPA passivation produced between a 2 and 3 order of magnitude improvement in μ n from ∼10-5-10-6 cm2 V-1 s-1 to ∼10-3 cm2 V-1 s-1. The bias dependence of the post-transit photocurrent decays in ODPA-passivated nanowires indicated that minority carriers were lost to trapping and/or monomolecular recombination for small values of bias (<5 V). Bimolecular recombination was indicated to be the dominant recombination mechanism at higher bias values.
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Affiliation(s)
- A Mohammadpour
- Department of Electrical and Computer Engineering, University of Alberta, 9211-116 St, Edmonton, AB T6G 1H9, Canada
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8
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Xu Z, Liu Y, Ren F, Yang F, Ma D. Development of functional nanostructures and their applications in catalysis and solar cells. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.03.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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9
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Liu X, Xing Z, Zhang H, Wang W, Zhang Y, Li Z, Wu X, Yu X, Zhou W. Fabrication of 3 D Mesoporous Black TiO2 /MoS2 /TiO2 Nanosheets for Visible-Light-Driven Photocatalysis. CHEMSUSCHEM 2016; 9:1118-24. [PMID: 27111114 DOI: 10.1002/cssc.201600170] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Indexed: 05/14/2023]
Abstract
A novel 3 D mesoporous black TiO2 (MBT)/MoS2 /MBT sandwich-like nanosheet was successfully fabricated using a facile mechanochemical process combined with an in situ solid-state chemical reduction approach, followed by mild calcination (350 °C) under an argon atmosphere. The MBT/MoS2 /MBT exhibits a 3 D sandwich-like nanosheet structure and heterojunctions are formed at the interfaces between MoS2 and black TiO2 . The significantly narrowed band gap of MBT/MoS2 /MBT is attributed to the introduction of MoS2 and the formed Ti(3+) species in the frameworks. The visible-light photocatalytic degradation rate of methyl orange and the hydrogen production rate are as high as 89.86 % and 0.56 mmol h(-1) g(-1) , respectively. The introduction of MoS2 and Ti(3+) in the frameworks favors the visible-light absorption and the separation of photogenerated charges, and the 3 D sandwich-like heterojunction structure facilitates the transfer of photogenerated charges.
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Affiliation(s)
- Xuefeng Liu
- Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of PR China, Heilongjiang University, No. 74 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150080, P.R. China
| | - Zipeng Xing
- Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of PR China, Heilongjiang University, No. 74 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150080, P.R. China.
| | - Hang Zhang
- Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of PR China, Heilongjiang University, No. 74 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150080, P.R. China
| | - Wenmei Wang
- Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of PR China, Heilongjiang University, No. 74 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150080, P.R. China
| | - Yan Zhang
- Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of PR China, Heilongjiang University, No. 74 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150080, P.R. China
| | - Zhenzi Li
- Department of Epidemiology and Biostatistics, Harbin Medical University, No. 194 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150040, P.R. China
| | - Xiaoyan Wu
- Department of Epidemiology and Biostatistics, Harbin Medical University, No. 194 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150040, P.R. China
| | - Xiujuan Yu
- Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of PR China, Heilongjiang University, No. 74 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150080, P.R. China.
| | - Wei Zhou
- Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of PR China, Heilongjiang University, No. 74 Xuefu Road, Nangang District, Harbin City, Heilongjiang Province, 150080, P.R. China.
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10
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Leem YC, Seo O, Jo YR, Kim JH, Chun J, Kim BJ, Noh DY, Lim W, Kim YI, Park SJ. Titanium oxide nanotube arrays for high light extraction efficiency of GaN-based vertical light-emitting diodes. NANOSCALE 2016; 8:10138-10144. [PMID: 27121775 DOI: 10.1039/c6nr00503a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
TiO2 nanotube (NT) arrays were fabricated on the surface of n-GaN through a liquid-phase conversion process using ZnO nanorods (NRs) as a template for high-efficiency InGaN/GaN multiple quantum well (MQW) vertical light-emitting diodes (VLEDs). The optical output power of the VLEDs with TiO2 NTs was remarkably enhanced by 23% and 189% at an injection current of 350 mA compared to those of VLEDs with ZnO NRs and planar VLEDs, respectively. The large enhancement in optical output is attributed to a synergistic effect of efficient light injection from the n-GaN layer of the VLED to TiO2 NTs because of the well-matched refractive indices and superior light extraction into air at the end of the TiO2 NTs. Light propagation along various configurations of TiO2 NTs on the VLEDs was investigated using finite-difference time domain simulations and the results indicated that the wall thickness of the TiO2 NTs should be maintained close to 20 nm for superior light extraction from the VLEDs.
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Affiliation(s)
- Young-Chul Leem
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.
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11
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Li H, Wang Y, Chen G, Sang Y, Jiang H, He J, Li X, Liu H. Few-layered MoS2 nanosheets wrapped ultrafine TiO2 nanobelts with enhanced photocatalytic property. NANOSCALE 2016; 8:6101-6109. [PMID: 26932455 DOI: 10.1039/c5nr08796a] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Photocatalytic materials comprised of semiconductor nanostructures have attracted tremendous scientific and technological interest over the last 30 years. This is due to the fact that these photocatalytic materials have unique properties that allow for an effective direct energy transfer from light to highly reactive chemical species which are applicable in the remediation of environmental pollutants and photocatalytic hydrogen generation. Heterostructured photocatalysts are a promising type of photocatalyst which can combine the properties of different components to generate a synergic effect, resulting in a high photocatalytic activity. In this work, a heterostructured photocatalyst comprised of few-layered MoS2 nanosheets coated on a TiO2 nanobelts surface was synthesized through a simple hydrothermal treatment. The hybrid heterostructures with enhanced broad spectrum photocatalytic properties can harness UV and visible light energy to decompose organic contaminants in aqueous solutions as well as split water to hydrogen and oxygen. The mechanism of the enhancement is that the MoS2/TiO2 nanobelts heterostructure can enhance the separation of the photo-induced carriers, which results in a higher photocurrent due to the special electronic characteristics of the graphene-like layered MoS2 nanosheets. This methodology is potentially applicable to the synthesis of a range of hybrid nanostructures with promising applications in photocatalysis and other relevant areas.
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Affiliation(s)
- Haidong Li
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
| | - Yana Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
| | - Guohui Chen
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
| | - Yuanhua Sang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
| | - Huaidong Jiang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
| | - Jiating He
- Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Innovis, #08-3, 138634, Singapore.
| | - Xu Li
- Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Innovis, #08-3, 138634, Singapore.
| | - Hong Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
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12
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Lan X, Voznyy O, Kiani A, García de Arquer FP, Abbas AS, Kim GH, Liu M, Yang Z, Walters G, Xu J, Yuan M, Ning Z, Fan F, Kanjanaboos P, Kramer I, Zhitomirsky D, Lee P, Perelgut A, Hoogland S, Sargent EH. Passivation Using Molecular Halides Increases Quantum Dot Solar Cell Performance. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:299-304. [PMID: 26576685 DOI: 10.1002/adma.201503657] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 09/09/2015] [Indexed: 05/19/2023]
Abstract
A solution-based passivation scheme is developed featuring the use of molecular iodine and PbS colloidal quantum dots (CQDs). The improved passivation translates into a longer carrier diffusion length in the solid film. This allows thicker solar-cell devices to be built while preserving efficient charge collection, leading to a certified power conversion efficiency of 9.9%, which is a new record in CQD solar cells.
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Affiliation(s)
- Xinzheng Lan
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Oleksandr Voznyy
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Amirreza Kiani
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - F Pelayo García de Arquer
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Abdullah Saud Abbas
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Gi-Hwan Kim
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Mengxia Liu
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Zhenyu Yang
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Grant Walters
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Jixian Xu
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Mingjian Yuan
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Zhijun Ning
- School of Physical Science and Technology, Shanghai Tech University, 100 Haike Rd., Pudong New Area, Shanghai, 201210, China
| | - Fengjia Fan
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Pongsakorn Kanjanaboos
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Illan Kramer
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - David Zhitomirsky
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Philip Lee
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Alexander Perelgut
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Sjoerd Hoogland
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
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Najeeb MA, Abdullah SM, Aziz F, Azmer MI, Swelm W, Al-Ghamdi AA, Ahmad Z, Supangat A, Sulaiman K. Improvement in the photovoltaic properties of hybrid solar cells by incorporating a QD-composite in the hole transport layer. RSC Adv 2016. [DOI: 10.1039/c6ra01052k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A hybrid solar cell (HSC) based on a ZnSe and CdSe QDs-composite with improved power conversion efficiency has been demonstrated.
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Affiliation(s)
- Mansoor Ani Najeeb
- Low Dimensional Materials Research Centre (LDMRC)
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
| | - Shahino Mah Abdullah
- Low Dimensional Materials Research Centre (LDMRC)
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
| | - Fakhra Aziz
- Low Dimensional Materials Research Centre (LDMRC)
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
| | - Mohamad Izzat Azmer
- Low Dimensional Materials Research Centre (LDMRC)
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
| | - Wageh Swelm
- Department of Physics
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Ahmed A. Al-Ghamdi
- Department of Physics
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Zubair Ahmad
- Department of Electrical Engineering
- College of Engineering
- Qatar University
- Doha
- Qatar
| | - Azzuliani Supangat
- Low Dimensional Materials Research Centre (LDMRC)
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
| | - Khaulah Sulaiman
- Low Dimensional Materials Research Centre (LDMRC)
- Department of Physics
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
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14
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Hu Q, Liu X, Wu C, You Q, Shi T, Zhang W. A general and rapid approach to hybrid metal nanoparticle–ZnO nanowire arrays and their use as active substrates for surface-enhanced Raman scattering detection. RSC Adv 2016. [DOI: 10.1039/c5ra24113h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Rapid SERS substrate preparation: an aqueous phase reaction of metal precursors with ZnO@Zn has been exploited for synthesizing SERS-active metal–ZnO nanowire arrays.
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Affiliation(s)
- Qiyan Hu
- College of Chemistry and Materials Science
- Anhui Normal University
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
| | - Xiaowang Liu
- College of Chemistry and Materials Science
- Anhui Normal University
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
| | - Chaoting Wu
- College of Chemistry and Materials Science
- Anhui Normal University
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
| | - Qing You
- College of Chemistry and Materials Science
- Anhui Normal University
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
| | - Tianchao Shi
- College of Chemistry and Materials Science
- Anhui Normal University
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
| | - Wu Zhang
- College of Chemistry and Materials Science
- Anhui Normal University
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
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15
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Yu L, Jia J, Yi G, Han M. Photoelectrochemical properties of PbS quantum dot sensitized TiO2 nanorods photoelectrodes. RSC Adv 2016. [DOI: 10.1039/c6ra02543a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cross-sectional view FESEM images of (a) TiO2 NRs, (b) PbS(4)/TiO2 NRs (the insets show the top-view of the corresponding cross-sectional view FESEM images). 3D schematic diagrams of (c) TiO2 NRs, (d) PbS(4)/TiO2 NRs.
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Affiliation(s)
- Limin Yu
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- PR China
| | - Junhong Jia
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- PR China
| | - Gewen Yi
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- PR China
| | - Minmin Han
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- PR China
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16
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Wen M, Zhang S, Dai W, Li G, Zhang D. In situ synthesis of Ti3+ self-doped mesoporous TiO2 as a durable photocatalyst for environmental remediation. CHINESE JOURNAL OF CATALYSIS 2015. [DOI: 10.1016/s1872-2067(15)60992-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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