Analyses of hydrogen sorption kinetics and thermodynamics of magnesium–misch metal alloys

摘要: Abstract The multi-component Mg– x  wt.% Mm alloys are synthesized using the mechanical ball-milling technique and their hydrogen storage capacities, absorption/desorption kinetics, thermodynamic parameters quantified. analysis of kinetic properties presented here is based on method exponential peeling. It seen that presence misch metal (Mm) in alloy samples dramatically decreases rate decrepitation increases cyclic stability. However, increased concentration has an adverse effect capacity reaction rate. also vary with temperature. best absorption kinetics observed at temperatures around 300 °C desorption quite fast 400 °C above. activation energy hydride much lower than MgH 2 . pressure–composition–isotherm ( P – C T ) plots 300–420 °C indicate possess good stability but very poor reversibility, making study difficult. increase metal's rare earths leads to equilibrium pressure decrease capacity.