Abstract
Hydrogen storage in the solid state method focuses more on attraction and requires large-scale research. Ab initio calculations of zinc-based Alkali metal hydrides X2ZnH4 (X = K, Rb and Cs) were performed to analyse the structural, electronic, thermal, and elastic properties. Studied hydrides are stable in the orthorhombic phase with space group16- PP222. Phonon dispersion curves are calculated at ambient conditions reveals thermodynamic stability. Electronic band structures and density of states reveal that these hydrides are direct bandgap semiconductors. Also, thermoelectric properties like thermal conductivity, electrical conductivity, specific heat capacity, Seebeck coefficient, Hall coefficient and carrier concentration are investigated using BoltzTraP software. In addition, the elastic constants have been calculated, and the mechanical properties such as bulk modulus, shear modulus, Young’s modulus and Poisson’s ratio have been calculated using these elastic constants. According to well-known Born stability criteria, K2ZnH4 and Rb2ZnH4 are mechanically stable, while Cs2ZnH4 is unstable. These hydrides might be used in hydrogen storage applications due to moderate gravimetric hydrogen density, which is 2.7 wt%, 1.6 wt%, 1.2 wt% for K2ZnH4, Rb2ZnH4, Cs2ZnH4, respectively.
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The authors would like to acknowledge the Researchers Supporting Project Number (RSP2024R71), King Saud University Riyadh Saudi Arabia.
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Conceptualization, Hafeez ur Rehman and Hafiz Hamid Raza; Methodology, Hafeez ur Rehman and Hafiz Hamid Raza; Software, G. Murtaza and Hafeez ur Rehman; Validation, G. Murtaza; Formal Analysis, Nawaz Muhammad; Investigation, Hafeez ur Rehman and Nawaz Muhammad; Resources, G. Murtaza and Nawaz Muhammad; Data Curation, Hafiz Hamid Raza; Writing-Original Draft Preparation, Hafeez ur Rehman; Writing-Review & Editing, Shahid M. Ramay, M. Irfan and M Awais Rehman; Visualization, Nawaz Muhammad and G. Murtaza; Supervision, G. Murtaza and Nawaz Muhammad; Project Administration, G. Murtaza; Funding Acquisition, No.
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Rehman, H.U., Muhammad, N., Murtaza, G. et al. The investigation of structural, electronic, thermal, and elastic properties of X2ZnH4 (X = K, Rb and Cs) for hydrogen storage applications: DFT study. Opt Quant Electron 56, 636 (2024). https://doi.org/10.1007/s11082-024-06308-8
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DOI: https://doi.org/10.1007/s11082-024-06308-8