Abstract
Amorphous and nanocrystalline PrMg12 is ball-milled with 30 wt% Ni powder. The impact of ball milling time on the thermodynamics and kinetics of hydrogen storage in this alloy is systematically studied. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) were employed to characterize the phase composition and microstructure. The result shows that the microstructure of PrMg12+30 wt%Ni alloy is predominantly amorphous and nanocrystalline. Prior to hydrogen absorption, the primary phases were identified as PrMg12, Ni and Mg2Ni. Following hydrogenation, these phases transform into MgH2 and Mg2NiH4. Pressure-composition-temperature (PCT) curves and kinetic data were acquired using a Sieverts apparatus. The thermodynamic and kinetic parameters are calculated by combining Van't Hoff equation, JMAK model and Arrhenius equation. The effect of ball milling time on the enthalpy and entropy changes of hydrogen desorption was found to be negligible. Notably, the activation energy for dehydrogenation reached a minimum value of 79.86 kJ/mol after 10 h of ball milling.
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