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

To explore the effect of C@Pr2O3 on the hydrogen storage performance of Mg-La-Ni alloy. In experiment, a nanostructured composite catalyst C@Pr2O3 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 degree celsius, the two-minute hydrogen saturation ratio of Mg96NiLa3 +5 wt% C@Pr2O3 was 80.65 %, Mg96NiLa3 +7 wt% C@Pr2O3 releases 3 wt% H-2 at 340 degrees C for 6 min. This can be attributed to the addition of nanoscale C and catalyst Pr2O3, which improved the hydrogen kinetics of the alloys. The dehydrogenation activation of Mg96NiLa3 +5 wt%C@Pr2O3 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 Mg96NiLa3 +5 wt% C@Pr2O3 was 72 KJ/mol. However, the thermodynamic properties of the alloy were still not satisfied with the requirements of practical application.