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Abstract <p>In this study, the hydrogen storage properties of the Ti<sub>1.6</sub>Sc<sub>0.2</sub>CrVNi<sub>0.2</sub> alloy have been systematically investigated. The effect of scandium (Sc) substitution on the structural characteristics and hydrogen absorption–desorption behaviour of the base Ti<sub>1.8</sub>CrVNi<sub>0.2</sub> alloy was examined. The alloy was prepared using the arc melting technique and crystallizes in a body-centred cubic (bcc) structure. Partial substitution of titanium (Ti) with scandium resulted in an increase in the lattice parameter with marginal improvement in the hydrogen storage capacity. However, the incorporation of Sc significantly improved the hydrogen absorption kinetics. The alloy exhibited a maximum hydrogen storage capacity of 3.72 mass% at 303&#xa0;K. The enthalpy of hydrogen absorption was determined to be −&#xa0;53.5&#xa0;kJ·mol⁻<sup>1</sup> which is slightly lower than that of the Ti<sub>2</sub>CrV alloy. In situ hydrogen desorption measurements revealed that hydrogen desorption occurs at relatively low temperature, with a desorption peak observed at 393&#xa0;K. The plateau pressure of the alloy was found to be  ~ 1&#xa0;bar at higher temperature. Differential scanning calorimetry (DSC) analysis was carried out at three different heating rates to evaluate the thermal characteristics of dehydrogenation. Lower activation energy for the dehydrogenation process was obtained for this alloy.</p> Graphical Abstract <p></p>

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Synthesis characterization and influence of Sc on hydrogen storage properties of Ti1.8CrVNi0.2 alloy

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Asheesh Kumar,
  • Priyanka Ruz,
  • Seemita Banerjee,
  • V. Sudarsan

摘要

Abstract

In this study, the hydrogen storage properties of the Ti1.6Sc0.2CrVNi0.2 alloy have been systematically investigated. The effect of scandium (Sc) substitution on the structural characteristics and hydrogen absorption–desorption behaviour of the base Ti1.8CrVNi0.2 alloy was examined. The alloy was prepared using the arc melting technique and crystallizes in a body-centred cubic (bcc) structure. Partial substitution of titanium (Ti) with scandium resulted in an increase in the lattice parameter with marginal improvement in the hydrogen storage capacity. However, the incorporation of Sc significantly improved the hydrogen absorption kinetics. The alloy exhibited a maximum hydrogen storage capacity of 3.72 mass% at 303 K. The enthalpy of hydrogen absorption was determined to be − 53.5 kJ·mol⁻1 which is slightly lower than that of the Ti2CrV alloy. In situ hydrogen desorption measurements revealed that hydrogen desorption occurs at relatively low temperature, with a desorption peak observed at 393 K. The plateau pressure of the alloy was found to be  ~ 1 bar at higher temperature. Differential scanning calorimetry (DSC) analysis was carried out at three different heating rates to evaluate the thermal characteristics of dehydrogenation. Lower activation energy for the dehydrogenation process was obtained for this alloy.

Graphical Abstract