Investigation of hydrogen storage properties on the Mg-La-Ni alloy compounded with C@Pr2O3 composite catalyst

To explore the effect of C@Pr ₂O ₃ on the hydrogen storage performance of Mg-La-Ni alloy. In experiment, a nanostructured composite catalyst C@Pr ₂O ₃ was prepared using chemical blowing carbonization. The microstructures of the catalyst and alloy powder were characterized using techniques such as transmission electron microscope, high-resolution transmission electron microscopy, scanning electron microscope, and selective region electron diffraction. Hydrogen storage properties of the alloy were evaluated using Pressure-composition-temperature equipment, and it was observed that the addition of the catalyst significantly enhanced the hydrogen kinetics of the alloys. At 320 ℃, the two-minute hydrogen saturation ratio of Mg ₉₆NiLa ₃ +5 wt% C@Pr ₂O ₃ was 80.65 %, Mg ₉₆NiLa ₃ +7 wt% C@Pr ₂O ₃ releases 3 wt% H ₂ at 340 °C for 6 min. This can be attributed to the addition of nanoscale C and catalyst Pr ₂O ₃, which improved the hydrogen kinetics of the alloys. The dehydrogenation activation of Mg ₉₆NiLa ₃ +5 wt%C@Pr ₂O ₃ is 85.2 kJ/mol, enhancing the rate of hydrogen release while simultaneously reducing the activation energy required for dehydrogenation of the alloy. The enthalpy of hydrogen absorption of Mg ₉₆NiLa ₃ +5 wt% C@Pr ₂O ₃ was 72 KJ/mol. However, the thermodynamic properties of the alloy were still not satisfied with the requirements of practical application.