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<p>In this work, we explore the potential of the MXene material Zr<sub>2</sub>CO<sub>2</sub> for hydrogen storage using density functional theory (DFT) with DFT-D2 dispersion corrections. The adsorption energy of hydrogen molecules was calculated to identify the most stable adsorption sites. Two orientations, namely vertical and horizontal, were considered. The results show that the adsorption energy does not fall within the required range (-0.17 to -0.6&#xa0;eV) for effective storage. To enhance storage efficiency, lithium atom decoration was employed as a modification strategy. The most stable sites for Li atoms' attachment to the surface were identified. The results indicate that the hydrogen storage performance is Significantly enhanced. The 8Li@Zr<sub>2</sub>CO<sub>2</sub> structure can hold onto 16 <i>H</i><sub><i>2</i></sub> molecules, with the adsorption energy falling within the optimal range, i.e., -0.162 to -0.233&#xa0;eV. The adsorption of 16 H<sub>2</sub> molecules on the 8Li@Zr<sub>2</sub>CO<sub>2</sub> system has a gravimetric hydrogen storage capacity (C<sub>wt</sub> %) of 1.52% and a desorption temperature (T<sub>D</sub>) of 234.148&#xa0;K. Additionally, the material demonstrates stability and potential for reversible hydrogen storage at room temperature. However, further improvements can be achieved through structural modification or alternative surface functionalization.</p>

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Hydrogen storage performance of MXene Zr2CO2 material decorated with Li atoms: a DFT study

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Radouane Asri,
  • Isam Allaoui,
  • Mohamed Khuili,
  • Kenza Maher,
  • El Houssine Atmani,
  • Nejma Fazouan

摘要

In this work, we explore the potential of the MXene material Zr2CO2 for hydrogen storage using density functional theory (DFT) with DFT-D2 dispersion corrections. The adsorption energy of hydrogen molecules was calculated to identify the most stable adsorption sites. Two orientations, namely vertical and horizontal, were considered. The results show that the adsorption energy does not fall within the required range (-0.17 to -0.6 eV) for effective storage. To enhance storage efficiency, lithium atom decoration was employed as a modification strategy. The most stable sites for Li atoms' attachment to the surface were identified. The results indicate that the hydrogen storage performance is Significantly enhanced. The 8Li@Zr2CO2 structure can hold onto 16 H2 molecules, with the adsorption energy falling within the optimal range, i.e., -0.162 to -0.233 eV. The adsorption of 16 H2 molecules on the 8Li@Zr2CO2 system has a gravimetric hydrogen storage capacity (Cwt %) of 1.52% and a desorption temperature (TD) of 234.148 K. Additionally, the material demonstrates stability and potential for reversible hydrogen storage at room temperature. However, further improvements can be achieved through structural modification or alternative surface functionalization.