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Haider ASMR, Hezam AFAM, Islam MA, Arafat Y, Ferdaous MT, Salehin S, Karim MR. Temperature-dependent failure of atomically thin MoTe 2. J Mol Model 2024; 30:86. [PMID: 38413404 DOI: 10.1007/s00894-024-05883-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Accepted: 02/20/2024] [Indexed: 02/29/2024]
Abstract
CONTEXT In this study, we investigated the mechanical responses of molybdenum ditelluride (MoTe2) using molecular dynamics (MD) simulations. Our key focus was on the tensile behavior of MoTe2 with trigonal prismatic phase (2H-MoTe2) which was investigated under uniaxial tensile stress for both armchair and zigzag directions. Crack formation and propagation were examined to understand the fracture behavior of such material for varying temperatures. Additionally, the study also assesses the impact of temperature on Young's modulus and fracture stress-strain of a monolayer of 2H-MoTe2. METHOD The investigation was done using molecular dynamics (MD) simulations using Stillinger-Weber (SW) potentials. The tensile behavior was simulated for temperature for 10 K and then from 100 to 600 K with a 100-K interval. The crack propagation and formation of 10 K and 300 K 2H-MoTe2 for both directions at different strain rates was analyzed using Ovito visualizer. All the simulations were conducted using a strain rate of 10-4 ps-1. The results show that the fracture strength of 2H-MoTe2 in the armchair and zigzag direction at 10 K is 16.33 GPa (11.43 N/m) and 13.71429 GPa (9.46 N/m) under a 24% and 18% fracture strain, respectively. The fracture strength of 2H-MoTe2 in the armchair and zigzag direction at 600 K is 10.81 GPa (7.56 N/m) and 10.13 GPa (7.09 N/m) under a 12.5% and 12.47% fracture strain, respectively.
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Affiliation(s)
- A S M Redwan Haider
- Depatment of Mechanical and Production Engineering, Islamic University of Technology, Gazipur, Bangladesh
| | | | - Md Akibul Islam
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Canada.
| | - Yeasir Arafat
- Depatment of Mechanical and Production Engineering, Islamic University of Technology, Gazipur, Bangladesh
| | - Mohammad Tanvirul Ferdaous
- Depatment of Mechanical and Production Engineering, Islamic University of Technology, Gazipur, Bangladesh
| | - Sayedus Salehin
- Depatment of Mechanical and Production Engineering, Islamic University of Technology, Gazipur, Bangladesh
| | - Md Rezwanul Karim
- Depatment of Mechanical and Production Engineering, Islamic University of Technology, Gazipur, Bangladesh.
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Ogunkunle SA, Bouzid A, Hinsch JJ, Allen OJ, White JJ, Bernard S, Wu Z, Zhu Y, Wang Y. Defect engineering of 1T' MX2( M= Mo, W and X= S, Se) transition metal dichalcogenide-based electrocatalyst for alkaline hydrogen evolution reaction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:145002. [PMID: 38157553 DOI: 10.1088/1361-648x/ad19a4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 12/28/2023] [Indexed: 01/03/2024]
Abstract
The alkaline electrolyzer (AEL) is a promising device for green hydrogen production. However, their energy conversion efficiency is currently limited by the low performance of the electrocatalysts for the hydrogen evolution reaction (HER). As such, the electrocatalyst design for the high-performance HER becomes essential for the advancement of AELs. In this work, we used both hydrogen (H) and hydroxyl (OH) adsorption Gibbs free energy changes as the descriptors to investigate the catalytic HER performance of 1T' transition metal dichalcogenides (TMDs) in an alkaline solution. Our results reveal that the pristine sulfides showed better alkaline HER performance than their selenide counterparts. However, the activities of all pristine 1T' TMDs are too low to dissociate water. To improve the performance of these materials, defect engineering techniques were used to design TMD-based electrocatalysts for effective HER activity. Our density functional theory results demonstrate that introducing single S/Se vacancy defects can improve the reactivities of TMD materials. Yet, the desorption of OH becomes the rate-determining step. Doping defective MoS2with late 3d transition metal (TM) atoms, especially Cu, Ni, and Co, can regulate the reactivity of active sites for optimal OH desorption. As a result, the TM-doped defective 1T' MoS2can significantly enhance the alkaline HER performance. These findings highlight the potential of defect engineering technologies for the design of TMD-based alkaline HER electrocatalysts.
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Affiliation(s)
- Samuel Akinlolu Ogunkunle
- Centre for Clean Environment and Energy, School of Environment and Science, Griffith University, Gold Coast Campus, Southport 4222, Australia
| | - Assil Bouzid
- Institut de Recherche sur les Céramiques (IRCER), UMR CNRS 7315-Université de Limoges, Limoges 87068, France
| | - Jack Jon Hinsch
- Centre for Clean Environment and Energy, School of Environment and Science, Griffith University, Gold Coast Campus, Southport 4222, Australia
| | - Oscar J Allen
- Centre for Clean Environment and Energy, School of Environment and Science, Griffith University, Gold Coast Campus, Southport 4222, Australia
| | - Jessica Jein White
- Centre for Clean Environment and Energy, School of Environment and Science, Griffith University, Gold Coast Campus, Southport 4222, Australia
| | - Samuel Bernard
- Institut de Recherche sur les Céramiques (IRCER), UMR CNRS 7315-Université de Limoges, Limoges 87068, France
| | - Zhenzhen Wu
- Centre for Clean Environment and Energy, School of Environment and Science, Griffith University, Gold Coast Campus, Southport 4222, Australia
| | - Yong Zhu
- School of Engineering and Built Environment, Griffith University, Gold Coast Campus, Southport 4222, Australia
| | - Yun Wang
- Centre for Clean Environment and Energy, School of Environment and Science, Griffith University, Gold Coast Campus, Southport 4222, Australia
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