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Ali SA, Sadiq I, Ahmad T. Oxide based Heterostructured Photocatalysts for CO
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Reduction and Hydrogen Generation. ChemistrySelect 2023. [DOI: 10.1002/slct.202203176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- Syed Asim Ali
- Nanochemistry Laboratory Department of Chemistry, Jamia Millia Islamia New Delhi 110025 India
| | - Iqra Sadiq
- Nanochemistry Laboratory Department of Chemistry, Jamia Millia Islamia New Delhi 110025 India
| | - Tokeer Ahmad
- Nanochemistry Laboratory Department of Chemistry, Jamia Millia Islamia New Delhi 110025 India
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Facile Synthesis of ZnSe/Co3O4 Heterostructure Nanocomposites for the Photocatalytic Degradation of Congo Red Dye. Catalysts 2022. [DOI: 10.3390/catal12101184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In the present paper, simple hydrothermal and solid-state methods are reported for the synthesis of metal chalcogenide (ZnSe), metal oxide (Co3O4) and their nano-heterostructure (ZnSe/Co3O4 3:1, 1:1 and 1:3 ratios by weight), while their photocatalytic efficiencies are also investigated. The X-ray diffraction results corroborate the good crystallinity and purity of all synthesized products, i.e., ZnSe, Co3O4 and their nanocomposites. The scanning electron micro-images of ZnSe show a mixed morphology of nanoparticles (≈16 nm), including spherical and distorted cubes, while Co3O4 has a worm-like morphology (≈20 × 50 nm). The EDX results show that all the elements are present in accordance with their anticipated amounts in the products. The UV/visible absorption spectrum of ZnSe depicts a sharp absorption at around 480 nm, while Co3O4 demonstrates two prominent peaks, 510 nm and 684 nm. The prepared samples were employed for the photocatalytic degradation of Congo red dye and the nano-heterostructure (ZnSe/Co3O4 3:1) shows an exceptional photocatalytic degradation efficiency of 96%. This enhanced photocatalytic activity was due to the synergic effect of ZnSe and Co3O4 that reduced the electron/hole recombination and caused suitable bandgap alignment.
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Tien TM, Chung YJ, Huang CT, Chen EL. WSSe Nanocomposites for Enhanced Photocatalytic Hydrogen Evolution and Methylene Blue Removal under Visible-Light Irradiation. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5616. [PMID: 36013753 PMCID: PMC9412401 DOI: 10.3390/ma15165616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/08/2022] [Accepted: 08/13/2022] [Indexed: 06/15/2023]
Abstract
In this study, a novel tungsten disulfide diselenide (WSSe) nanocomposite by a facile hydrothermal process with great capable photocatalytic efficiency for hydrogen evolution from water and organic compound removal was discussed. The WSSe nanocomposites form heterojunctions in order to inhibit the quick recombination rate of photo-induced electrons and holes. This is considered to be a useful method in order to enhance the capability of photocatalytic hydrogen production. The hydrogen production rate of the WSSe nanocomposites approaches 3647.4 μmol/g/h, which is 12 and 11 folds the rates of the bare WS2 and WSe2, respectively. Moreover, the excellent photocatalytic performance for Methylene blue (MB) removal (88%) was 2.5 and 1.8 times higher than those of the bare WS2 and WSe2, respectively. The great photocatalytic efficiency was owing to the capable electrons and holes separation of WSSe and the construction of the heterostructure, which possessed vigorous photocatalytic oxidation and reduction potentials. The novel one-dimensional structure of the WSSe heterojunction shortens the transport pathway of the photo-induced electrons and holes. It possesses the great capable photocatalytic efficiency of the hydrogen production and organic dye removal. This study offers an insight into the route of interfacial migration and separation for induced charge carriers in order to generate clean hydrogen energy and to solve the issue of environmental pollution.
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Affiliation(s)
- Tsung-Mo Tien
- Coastal Water and Environment Center, College of Hydrosphere Science, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan
| | - Yu-Jen Chung
- Department of Marine Science, Republic of China Naval Academy, Kaohsiung 81300, Taiwan
| | - Chen-Tang Huang
- Coastal Water and Environment Center, College of Hydrosphere Science, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan
| | - Edward L. Chen
- Coastal Water and Environment Center, College of Hydrosphere Science, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan
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4
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Simulation of a New CZTS Solar Cell Model with ZnO/CdS Core-Shell Nanowires for High Efficiency. CRYSTALS 2022. [DOI: 10.3390/cryst12060772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The numerical modeling of Cu2ZnSnS4 solar cells with ZnO/CdS core-shell nanowires of optimal dimensions with and without graphene is described in detail in this study. The COMSOL Simulation was used to determine the optimal values of core diameter and shell thickness by comparing their optical performance and to evaluate the optical and electrical properties of the different models. The deposition of a nanolayer of graphene on the layer of MoS2 made it possible to obtain a maximum absorption of 97.8% against 96.5% without the deposition of graphene.The difference between generation rates and between recombination rates of electron–hole pairs of models with and without graphene is explored.The electrical parameters obtained, such as the filling factor (FF), the short-circuit current density (Jsc), the open-circuit voltage (Voc), and the efficiency (EFF) are, respectively, 81.7%, 6.2 mA/cm2, 0.63 V, and 16.6% in the presence of graphene against 79.2%, 6.1 mA/cm2, 0.6 V, and 15.07% in the absence of graphene. The suggested results will be useful for future research work in the field of CZTS-based solar cells with ZnO/CdS core-shell nanowires with broadband light absorption rates.
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Sundararaju U, Mohammad Haniff MAS, Ker PJ, Menon PS. MoS 2/h-BN/Graphene Heterostructure and Plasmonic Effect for Self-Powering Photodetector: A Review. MATERIALS (BASEL, SWITZERLAND) 2021; 14:1672. [PMID: 33805402 PMCID: PMC8037851 DOI: 10.3390/ma14071672] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 03/11/2021] [Accepted: 03/18/2021] [Indexed: 11/17/2022]
Abstract
A photodetector converts optical signals to detectable electrical signals. Lately, self-powered photodetectors have been widely studied because of their advantages in device miniaturization and low power consumption, which make them preferable in various applications, especially those related to green technology and flexible electronics. Since self-powered photodetectors do not have an external power supply at zero bias, it is important to ensure that the built-in potential in the device produces a sufficiently thick depletion region that efficiently sweeps the carriers across the junction, resulting in detectable electrical signals even at very low-optical power signals. Therefore, two-dimensional (2D) materials are explored as an alternative to silicon-based active regions in the photodetector. In addition, plasmonic effects coupled with self-powered photodetectors will further enhance light absorption and scattering, which contribute to the improvement of the device's photocurrent generation. Hence, this review focuses on the employment of 2D materials such as graphene and molybdenum disulfide (MoS2) with the insertion of hexagonal boron nitride (h-BN) and plasmonic nanoparticles. All these approaches have shown performance improvement of photodetectors for self-powering applications. A comprehensive analysis encompassing 2D material characterization, theoretical and numerical modelling, device physics, fabrication and characterization of photodetectors with graphene/MoS2 and graphene/h-BN/MoS2 heterostructures with plasmonic effect is presented with potential leads to new research opportunities.
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Affiliation(s)
- Umahwathy Sundararaju
- Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 43600, Malaysia; (U.S.); (M.A.S.M.H.)
| | | | - Pin Jern Ker
- Institute of Sustainable Energy (ISE), Universiti Tenaga Nasional (UNITEN), Kajang 43000, Malaysia;
| | - P. Susthitha Menon
- Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 43600, Malaysia; (U.S.); (M.A.S.M.H.)
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MoS 2@ZnO Nanoheterostructures Prepared by Electrospark Erosion for Photocatalytic Applications. NANOMATERIALS 2021; 11:nano11010157. [PMID: 33435493 PMCID: PMC7827484 DOI: 10.3390/nano11010157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/05/2021] [Accepted: 01/07/2021] [Indexed: 12/17/2022]
Abstract
MoS2@ZnO nanoheterostructures were synthesized by electrospark erosion of zinc granules in a hydrogen peroxide solution and simultaneous addition of MoS2 nanostructured powder into the reaction zone. The morphology, size of the crystallites, as well as elemental and phase composition of the prepared structures, were examined using transmission electron microscopy and X-ray diffraction analysis. It was found that the synthesized products represent heterostructures containing MoS2 nanoparticles formed on ZnO nanoparticles. Raman spectroscopy and photoluminescence analysis were also used for characterization of the prepared heterostructures. The obtained MoS2@ZnO nanostructures revealed an intense broad emission band ranging from 425 to 625 nm for samples with different fractions of MoS2. Photocatalytic measurements showed that the maximal hydrogen evolution rate of the prepared nanoheterostructures was about 906.6 μmol·g−1·h−1. The potential of their application in photocatalytic water splitting was also estimated.
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Visible light responsive photocatalytic hydrogen evolution using MoS2 incorporated ZnO. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01476-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Rameshkumar S, Henderson R, Padamati RB. Improved Surface Functional and Photocatalytic Properties of Hybrid ZnO-MoS 2-Deposited Membrane for Photocatalysis-Assisted Dye Filtration. MEMBRANES 2020; 10:membranes10050106. [PMID: 32455647 PMCID: PMC7281520 DOI: 10.3390/membranes10050106] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 05/15/2020] [Accepted: 05/18/2020] [Indexed: 11/16/2022]
Abstract
The synergistic mechanism of photocatalytic-assisted dye degradation has been demonstrated using a hybrid ZnO-MoS2-deposited photocatalytic membrane (PCM). Few layers of MoS2 sheets were produced using the facile and efficient surfactant-assisted liquid-phase exfoliation method. In this process, hydrophilic moieties of an anionic surfactant were adsorbed on the surface of MoS2, which aided exfoliation and promoted a stable dispersion due to the higher negative zeta potential of the exfoliated MoS2 sheets. Further, the decoration of ZnO on the exfoliated MoS2 sheets offered a bandgap energy reduction to about 2.77 eV, thus achieving an 87.12% degradation of methylene blue (MB) dye within 15 min of near UV-A irradiation (365 nm), as compared with pristine ZnO achieving only 56.89%. The photocatalysis-enhanced membrane filtration studies on the ZnO-MoS2 PCM showed a complete removal of MB dye (~99.95%). The UV-assisted dye degradation on the ZnO-MoS2 PCM offered a reduced membrane resistance, with the permeate flux gradually improving with the increase in the UV-irradiation time. The regeneration of the active ZnO-MoS2 layer also proved to be quite efficient with no compromise in the dye removal efficiency.
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Affiliation(s)
- Saranya Rameshkumar
- AMBER Centre, CRANN Institute, Trinity College Dublin, Dublin 2, Ireland;
- BiOrbic—Bioeconomy SFI Research Centre, University College Dublin, Belfield, Dublin 4, Ireland
- School of Physics, Trinity College Dublin, Dublin 2, Ireland
| | - Rory Henderson
- School of Physics, Trinity College Dublin, Dublin 2, Ireland
- School of Chemistry, Trinity College Dublin, Dublin 2, Ireland;
| | - Ramesh Babu Padamati
- AMBER Centre, CRANN Institute, Trinity College Dublin, Dublin 2, Ireland;
- BiOrbic—Bioeconomy SFI Research Centre, University College Dublin, Belfield, Dublin 4, Ireland
- School of Physics, Trinity College Dublin, Dublin 2, Ireland
- School of Chemistry, Trinity College Dublin, Dublin 2, Ireland;
- Correspondence:
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Gai Q, Ren S, Zheng X, Liu W, Dong Q, Gao R. Controllable photodeposition of nickel phosphide cocatalysts on cadmium sulfide nanosheets for enhanced photocatalytic hydrogen evolution performance. NEW J CHEM 2020. [DOI: 10.1039/c9nj06403f] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As efficient cocatalysts in photocatalytic processes, transition metal phosphides are usually synthesized in harsh and tedious conditions. So to achieve their simple and controllable loading on photocatalyst surface is especially valuable.
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Affiliation(s)
- Qixiao Gai
- Department of Optoelectronic Science
- Harbin Institute of Technology at Weihai
- Weihai 264209
- People's Republic of China
| | - Shoutian Ren
- Department of Optoelectronic Science
- Harbin Institute of Technology at Weihai
- Weihai 264209
- People's Republic of China
| | - Xiaochun Zheng
- Department of Optoelectronic Science
- Harbin Institute of Technology at Weihai
- Weihai 264209
- People's Republic of China
| | - Wenjun Liu
- Department of Optoelectronic Science
- Harbin Institute of Technology at Weihai
- Weihai 264209
- People's Republic of China
| | - Quanli Dong
- Department of Optoelectronic Science
- Harbin Institute of Technology at Weihai
- Weihai 264209
- People's Republic of China
| | - Renxi Gao
- Department of Optoelectronic Science
- Harbin Institute of Technology at Weihai
- Weihai 264209
- People's Republic of China
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Vo DD, Vu TV, Nguyen THT, Hieu NN, Phuc HV, Binh NTT, Idrees M, Amin B, Nguyen CV. Effects of electric field and strain engineering on the electronic properties, band alignment and enhanced optical properties of ZnO/Janus ZrSSe heterostructures. RSC Adv 2020; 10:9824-9832. [PMID: 35498594 PMCID: PMC9050402 DOI: 10.1039/d0ra00917b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 02/27/2020] [Indexed: 12/21/2022] Open
Abstract
The formation of van der Waals heterostructures (vdWHs) have recently emerged as promising structures to make a variety of novel nanoelectronic and optoelectronic devices. Here, in this work, we investigate the structural, electronic and optical features of ZnO/ZrSSe vdWHs for different stacking patterns of ZnO/SeZrS and ZnO/SZrSe by employing first-principles calculations. Binding energy and ab initio molecular dynamics calculations are also employed to confirm the structural and thermal stability of the ZnO/ZrSSe vdWHs for both models. We find that in both stacking models, the ZnO and ZrSSe layers are bonded via weak vdW forces, leading to easy exfoliation of the layers. More interestingly, both the ZnO/SeZrS and ZnO/SZrSe vdWHs posses type-II band alignment, making them promising candidates for the use of photovoltaic devices because the photogenerated electrons–holes are separated at the interface. The ZnO/ZrSSe vdWHs for both models possess high performance absorption in the visible and near-infrared regions, revealing their use for acquiring efficient photocatalysts. Moreover, the band gap values and band alignments of the ZnO/ZrSSe for both models can be adjusted by an electric field as well as vertical strains. There is a transformation from semiconductor to metal under a negative electric field and tensile vertical strain. These findings demonstrate that ZnO/ZrSSe vdWHs are a promising option for optoelectronic and nanoelectronic applications. Here, in this work, we investigate the structural, electronic and optical features of ZnO/ZrSSe vdWHs for different stacking patterns of ZnO/SeZrS and ZnO/SZrSe by employing first-principles calculations.![]()
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Affiliation(s)
- Dat D. Vo
- Division of Computational Physics
- Institute for Computational Science
- Ton Duc Thang University
- Ho Chi Minh City
- Vietnam
| | - Tuan V. Vu
- Division of Computational Physics
- Institute for Computational Science
- Ton Duc Thang University
- Ho Chi Minh City
- Vietnam
| | - Thi H. Tham Nguyen
- Center of Excellence for Green Energy and Environmental Nanomaterials
- Nguyen Tat Thanh University
- Ho Chi Minh City
- Vietnam
| | - Nguyen N. Hieu
- Institute of Research and Development
- Duy Tan University
- Da Nang 550000
- Vietnam
| | - Huynh V. Phuc
- Division of Theoretical Physics
- Dong Thap University
- Cao Lanh 870000
- Vietnam
| | - Nguyen T. T. Binh
- Institute of Research and Development
- Duy Tan University
- Da Nang 550000
- Vietnam
| | - M. Idrees
- Department of Physics
- Hazara University
- Mansehra 21300
- Pakistan
| | - B. Amin
- Department of Physics
- Abbottabad University of Science and Technology
- Abbottabad 22010
- Pakistan
| | - Chuong V. Nguyen
- Department of Materials Science and Engineering
- Le Quy Don Technical University
- Ha Noi 100000
- Vietnam
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Kumar S, Kumar A, Kumar A, Krishnan V. Nanoscale zinc oxide based heterojunctions as visible light active photocatalysts for hydrogen energy and environmental remediation. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2019. [DOI: 10.1080/01614940.2019.1684649] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Suneel Kumar
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi, India
| | - Ajay Kumar
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi, India
| | - Ashish Kumar
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi, India
| | - Venkata Krishnan
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi, India
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