Hydrogen Storage Behavior and Performance of Multiple Cold-Rolled MgH2/Nb2O5 Nanocomposite Powders

The global interest in MgH2 is due to the natural availability of Mg and its capacity retain hydrogen at a concentration up 7.60 wt.%. Despite appealing characteristics ease production on an industrial scale ambient temperature using reactive ball milling (RBM) technique, highly stable chemical with sluggish hydrogenation dehydrogenation rates below 300 °C. Among different methods used improve hydrogenation/dehydrogenation kinetic behavior MgH2, mechanical treatment and/or catalysis are regarded be most effective methods. purpose this research was explore effectiveness several cold rolling (CR) stages properties recycled magnesium rods, as well effect resulting RBM final product. For process, as-received waste Mg-rods were firstly cold-rolled 200 times then remilled under H2 atmosphere for 100 h. as-RBM powders passes ball-milled 10 15 wt.% Nb2O5 50 results showed that when materials subjected types defects (dislocations, stacking faults, twining) generated by CR RBM, their gas absorption/desorption kinetics improved. This indexed ability achieve long cycle lifetime lower temperatures compared materials. further improved terms decomposition upon nanocomposite MgH2/10 exhibit good storage capabilities comparatively low (225 °C) life extended from 110 h 170 h, without serious degradation kinetics.