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Verma AK, Sharma BB. Impact of Atomic Defects on Water Contact Angle of 2D Molybdenum Disulfide Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39267215 DOI: 10.1021/acs.langmuir.4c02324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/17/2024]
Abstract
Interfacial dynamics within nanofluidic systems are crucial for applications like water desalination and osmotic energy harvesting. Understanding these dynamics can inform the rational optimization of two-dimensional (2D) materials and devices for such applications. This study explores the wetting behavior of realistic 2D MoS2 surfaces incorporating vacancies and atomic steps, known as atomic defects. We employ a combined density functional theory (DFT) and molecular dynamics (MD) computational approach to elucidate the influence of atomic defects on the MoS2-water interface. DFT calculations are utilized to determine the charge distribution within MoS2. Subsequently, free energy calculations are obtained through MD simulations of the MoS2-water interface. Our findings underscore the importance of incorporating atomic defects into MoS2 surfaces for accurate water contact angle (WCA) predictions in nanofluidic simulations, particularly when using Abal et al. force field parameters. However, the force field developed by Liu et al. yielded more accurate results for pristine MoS2 surfaces. While these parameters provide reliable outcomes for pristine MoS2 surfaces, their application to surfaces with defects may lead to underestimation of WCA. This highlights the critical need for realistic surface representations in nanofluidic modeling to accurately capture the complex interactions between water and MoS2 materials.
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Affiliation(s)
- Ashutosh Kumar Verma
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
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2
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Irusta Y, Morón-Navarrete G, González C. Adsorption and dissociation of hydrogen molecules over S-vacancies in a Nb-doped MoS 2monolayer. NANOTECHNOLOGY 2024; 35:355703. [PMID: 38806004 DOI: 10.1088/1361-6528/ad50dd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 05/28/2024] [Indexed: 05/30/2024]
Abstract
Motivated by the recent interest in the hydrogen energy, we have carried out a complete study of the catalytic activity of a defective molybdenum disulfide monolayer (MoS2) by means of density functional theory (DFT) calculations. The MoS2monolayer is characterized by a nonreactive basal plane. In principle, its catalytic activity is concentrated at the edges, but an alternative way to increase such activity is obtained by creating active sites where the molecules can dissociate. These defects can be easily produced experimentally by different techniques. In our study, we have performed an atomic, energetic and electronic analysis of a hydrogen molecule adsorbed on a MoS2monolayer. In a first step, we have found that the H2molecule remains physisorbed over both doped-free and Nb-doped MoS2monolayers, showing that the Nb atom does not increase the poor reactivity of the clean MoS2layer. Interestingly, our energetic results suggest that the vacancies will prefer to be formed close to the Nb atoms in the doped monolayer, but the small energy difference would allow the formation in non-doped like sites. Theoretically, we found out the conditions for the molecular dissociation on a S vacancy. In both cases, with and without Nb, the molecule should rotate from the original perpendicular position to an almost parallel orientation jumping an energetic barrier. After that, the atoms are separated binding to the Mo atoms around the missing S atom. Ourab initiomolecular dynamics simulations show that for low pressure conditions (using one single molecule in the system) the H2prefers to desorb from the vacancy, while for larger pressures (when additional H2molecules are added to the system) the molecule is finally dissociated on the vacancy. Our long simulations confirm the great stability of the structure with the two H atoms binding to the Mo atoms close to the vacancy. Finally, the inclusion of a third (or a fourth) H atom in the vacancy leads to the formation and desorption of a H2molecule, leaving one (or two) atoms in the vacancy.
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Affiliation(s)
- Yako Irusta
- Departamento de Física de Materiales, Universidad Complutense de Madrid, E-28040 Madrid, Spain
- Instituto de Magnetismo Aplicado, UCM-ADIF, E-28230 Las Rozas de Madrid, Spain
| | | | - César González
- Departamento de Física de Materiales, Universidad Complutense de Madrid, E-28040 Madrid, Spain
- Instituto de Magnetismo Aplicado, UCM-ADIF, E-28230 Las Rozas de Madrid, Spain
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Eidsvåg H, Vajeeston P, Velauthapillai D. Doped MoS 2 Polymorph for an Improved Hydrogen Evolution Reaction. ACS OMEGA 2023; 8:26263-26275. [PMID: 37521613 PMCID: PMC10373197 DOI: 10.1021/acsomega.3c02623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 06/28/2023] [Indexed: 08/01/2023]
Abstract
Green hydrogen produced from solar energy could be one of the solutions to the growing energy shortage as non-renewable energy sources are phased out. However, the current catalyst materials used for photocatalytic water splitting (PWS) cannot compete with other renewable technologies when it comes to efficiency and production cost. Transition-metal dichalcogenides, such as molybdenum disulfides (MoS2), have previously proven to have electronic and optical properties that could tackle these challenges. In this work, optical properties, the d-band center, and Gibbs free energy are calculated for seven MoS2 polymorphs using first-principles calculations and density functional theory (DFT) to show that they could be suitable as photocatalysts for PWS. Out of the seven, the two polymorphs 3Ha and 2R1 were shown to have d-band center values closest to the optimal value, while the Gibbs free energy for all seven polymorphs was within 5% of each other. In a previous study, we found that 3Hb had the highest electron mobility among all seven polymorphs and an optimal bandgap for photocatalytic reactions. The 3Hb polymorphs were therefore selected for further study. An in-depth analysis of the enhancement of the electronic properties and the Gibbs free energy through substitutional doping with Al, Co, N, and Ni was carried out. For the very first time, substitutional doping of MoS2 was attempted. We found that replacing one Mo atom with Al, Co, I, N, and Ni lowered the Gibbs free energy by a factor of 10, which would increase the hydrogen evolution reaction of the catalyst. Our study further shows that 3Hb with one S atom replaced with Al, Co, I, N, or Ni is dynamically and mechanically stable, while for 3Hb, replacing one Mo atom with Al and Ni makes the structure stable. Based on the low Gibbs free energy, stability, and electronic bandgap 3Hb, MoS2 doped with Al for one Mo atom emerges as a promising candidate for photocatalytic water splitting.
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Affiliation(s)
- Håkon Eidsvåg
- Department
of Computing, Mathematics and Physics, Western
Norway University of Applied Sciences, Inndalsveien 28, Box, 5063 Bergen, Norway
| | - Ponniah Vajeeston
- Department
of Chemistry, Center for Materials Science and Nanotechnology, University of Oslo, Box 1033 Blindern, N-0315 Oslo, Norway
| | - Dhayalan Velauthapillai
- Department
of Computing, Mathematics and Physics, Western
Norway University of Applied Sciences, Inndalsveien 28, Box, 5063 Bergen, Norway
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Banu S L, Veerapandy V, Fjellvåg H, Vajeeston P. First-Principles Insights into the Relative Stability, Physical Properties, and Chemical Properties of MoSe 2. ACS OMEGA 2023; 8:13799-13812. [PMID: 37091371 PMCID: PMC10116531 DOI: 10.1021/acsomega.2c08217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 03/07/2023] [Indexed: 05/03/2023]
Abstract
A fascinating transition-metal dichalcogenide (TMDC) compound, MoSe2, has attracted a lot of interest in electrochemical, photocatalytic, and optoelectronic systems. However, detailed studies on the structural stability of the various MoSe2 polymorphs are still lacking. For the first time, the relative stability of 11 different MoSe2 polymorphs (1H, 2H, 3Ha, 3Hb, 2T, 4T, 2R1, 1T1, 1T2, 3T, and 2R2) is proposed, and a detailed analysis of these polymorphs is carried out by employing the first-principles calculations based on density functional theory (DFT). We computed the physical properties of the polymorphs such as band structure, phonon, and elastic constants to examine the viability for real-world applications. The electronic properties of the involved polymorphs were calculated by employing the hybrid functional of Heyd, Scuseria, and Ernzerhof (HSE06). The energy band gap of the polymorphs (1H, 2H, 3Ha, 3Hb, 2T, 4T, and 2R1) is in the range of 1.6-1.8 eV, coinciding with the experimental value for the polymorph 2H. The covalent bonding nature of MoSe2 is analyzed from the charge density, charge transfer, and electron localization function. Among the 11 polymorphs, 1H, 2H, 2T, and 3Hb polymorphs are predicted as stable polymorphs based on the calculation of the mechanical and dynamical properties. Even though the 4T and 3Ha polymorphs' phonons are stable, they are mechanically unstable; hence, they are considered to be under a metastable condition. Additionally, we computed the direction-dependent elastic moduli and isotropic factors for both mechanically and dynamically stable polymorphs. Stable polymorphs are analyzed spectroscopically using IR and Raman spectra. The thermal stability of the polymorphs is also studied.
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Affiliation(s)
- Lathifa Banu S
- Department
of Computational Physics, School of Physics, Madurai Kamaraj University, Palkalai Nagar, Madurai 625021, Tamil Nadu, India
| | - Vasu Veerapandy
- Department
of Computational Physics, School of Physics, Madurai Kamaraj University, Palkalai Nagar, Madurai 625021, Tamil Nadu, India
| | - Helmer Fjellvåg
- Department
of Chemistry and Center for Materials Science and Nanotechnology, University of Oslo, Oslo 0371, Norway
| | - Ponniah Vajeeston
- Department
of Chemistry and Center for Materials Science and Nanotechnology, University of Oslo, Oslo 0371, Norway
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Devamanoharan A, Veerapandy V, Vajeeston P. Structural, Electronic Properties, and Relative Stability Studies of Low-Energy Indium Oxide Polytypes Using First-Principles Calculations. ACS OMEGA 2023; 8:12928-12943. [PMID: 37065075 PMCID: PMC10099427 DOI: 10.1021/acsomega.3c00105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 03/17/2023] [Indexed: 06/19/2023]
Abstract
Materials made of indium oxide (In2O3) are now being used as a potential component of the next generation of computers and communication devices. Density functional theory is used to analyze the physical, electrical, and thermodynamical features of 12 low-energy bulk In2O3 polytypes. The cubic structure In2O3 is majorly used for many of the In2O3-based transparent conducting oxides. The objective of this study is to explore other new stable In2O3 polytypes that may exist. The structural properties and stability studies are performed using the Vienna ab initio simulation package code. All the In2O3 polytypes have semiconductive properties, according to electronic band structure investigations. The full elastic tensors and elastic moduli of all polytypes at 0 K are computed. Poisson's and Pugh's ratio confirms that all stable polytypes are ductile. The phonon and thermal properties including heat capacity are obtained for mechanically stable polytypes. For the first time, we report the Raman and infrared active modes of stable polytypes.
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Affiliation(s)
- Arthi Devamanoharan
- Department
of Computational Physics, School of Physics, Madurai Kamaraj University, Madurai 625021, India
| | - Vasu Veerapandy
- Department
of Computational Physics, School of Physics, Madurai Kamaraj University, Madurai 625021, India
| | - Ponniah Vajeeston
- Department
of Chemistry, Center for Materials Science and Nanotechnology, University of Oslo, Oslo 0371, Norway
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MoS2 as a Co-Catalyst for Photocatalytic Hydrogen Production: A Mini Review. Molecules 2022; 27:molecules27103289. [PMID: 35630769 PMCID: PMC9145188 DOI: 10.3390/molecules27103289] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/09/2022] [Accepted: 05/17/2022] [Indexed: 02/04/2023] Open
Abstract
Molybdenum disulfide (MoS2), with a two-dimensional (2D) structure, has attracted huge research interest due to its unique electrical, optical, and physicochemical properties. MoS2 has been used as a co-catalyst for the synthesis of novel heterojunction composites with enhanced photocatalytic hydrogen production under solar light irradiation. In this review, we briefly highlight the atomic-scale structure of MoS2 nanosheets. The top-down and bottom-up synthetic methods of MoS2 nanosheets are described. Additionally, we discuss the formation of MoS2 heterostructures with titanium dioxide (TiO2), graphitic carbon nitride (g-C3N4), and other semiconductors and co-catalysts for enhanced photocatalytic hydrogen generation. This review addresses the challenges and future perspectives for enhancing solar hydrogen production performance in heterojunction materials using MoS2 as a co-catalyst.
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Kajana T, Pirashanthan A, Velauthapillai D, Yuvapragasam A, Yohi S, Ravirajan P, Senthilnanthanan M. Potential transition and post-transition metal sulfides as efficient electrodes for energy storage applications: review. RSC Adv 2022; 12:18041-18062. [PMID: 35800326 PMCID: PMC9208027 DOI: 10.1039/d2ra01574a] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/29/2022] [Indexed: 12/25/2022] Open
Abstract
Electrochemical energy storage has attracted much attention due to the common recognition of sustainable energy development. Transition metal sulfides and post-transition metal sulfides have been intensively been focused on due to their potential as electrode materials for energy storage applications in different types of capacitors such as supercapacitors and pseudocapacitors, which have high power density and long cycle life. Herein, the physicochemical properties of transition and post-transition metal sulfides, their typical synthesis, structural characterization, and electrochemical energy storage applications are reviewed. Various perspectives on the design and fabrication of transition and post-transition metal sulfides-based electrode materials having capacitive applications are discussed. This review further discusses various strategies to develop transition and/or post-transition metal sulfide heterostructured electrode-based self-powered photocapacitors with high energy storage efficiencies. Electrochemical energy storage has attracted much attention due to the common recognition of sustainable energy development.![]()
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Affiliation(s)
- Thirunavukarasu Kajana
- Clean Energy Research Laboratory, Department of Physics, University of Jaffna, Jaffna, Sri Lanka
- Department of Chemistry, University of Jaffna, Jaffna, Sri Lanka
- Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway
| | - Arumugam Pirashanthan
- Clean Energy Research Laboratory, Department of Physics, University of Jaffna, Jaffna, Sri Lanka
- Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway
| | - Dhayalan Velauthapillai
- Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway
| | - Akila Yuvapragasam
- Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway
| | | | - Punniamoorthy Ravirajan
- Clean Energy Research Laboratory, Department of Physics, University of Jaffna, Jaffna, Sri Lanka
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Lee MG, Yang JW, Kwon HR, Jang HW. Crystal facet and phase engineering for advanced water splitting. CrystEngComm 2022. [DOI: 10.1039/d2ce00585a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review covers the principles and recent advances in facet and phase engineering of catalysts for photocatalytic, photoelectrochemical, and electrochemical water splitting. It suggests the basis of catalyst design for advanced water splitting.
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Affiliation(s)
- Mi Gyoung Lee
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 1A4, Canada
| | - Jin Wook Yang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hee Ryeong Kwon
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
- Advanced Institute of Convergence Technology, Seoul National University, Suwon, 16229, Republic of Korea
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Faraji M, Bafekry A, Gogova D, Hoat DM, Ghergherehchi M, Chuong NV, Feghhi SAH. Novel two-dimensional ZnO2, CdO2 and HgO2 monolayers: a first-principles-based prediction. NEW J CHEM 2021. [DOI: 10.1039/d1nj01610e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In this paper, the existence of monolayers with the chemical formula XO2, where X = Zn, Cd, and Hg with hexagonal and tetragonal lattice structures is theoretically predicted by means of first principles calculations.
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Affiliation(s)
- M. Faraji
- Micro and Nanotechnology Graduate Program
- TOBB University of Economics and Technology
- Ankara
- Turkey
| | - A. Bafekry
- Department of Radiation Application
- Shahid Beheshti University
- Tehran 1983969411
- Iran
- Department of Physics, University of Antwerp
| | - D. Gogova
- Department of Physics
- University of Oslo
- Blindern
- Norway
| | - D. M. Hoat
- Institute of Theoretical and Applied Research
- Duy Tan University
- Hanoi 100000
- Vietnam
- Faculty of Natural Sciences
| | - M. Ghergherehchi
- College of Electronic and Electrical Engineering
- Sungkyunkwan University
- Suwon
- Korea
| | - N. V. Chuong
- Department of Materials Science and Engineering
- Le Quy Don Technical University
- Hanoi 100000
- Vietnam
| | - S. A. H. Feghhi
- Department of Radiation Application
- Shahid Beheshti University
- Tehran 1983969411
- Iran
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