Reversible Hydrogen Storage via Titanium-Catalyzed LiAlH4 and Li3AlH6

摘要: A vibrating-mill technique, which can activate the reaction system by bringing reagents into very close contact at preparative scale and providing extra mechanical energy, much more effectively than well-known ball-milling method, was used to prepare titanium(III) chloride (TiCl3·1/3AlCl3)-doped lithium tetrahydridoaluminate (LiAlH4) hexahydridoaluminate (Li3AlH6) powders with nanocrystallites. The phase structure dehydriding/rehydriding properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TG), differential calorimetry (DSC). mechanism of reversible dehydrogenation rehydrogenation examined means photoelectron spectroscopy (XPS). Thermodynamic kinetic measurements showed a distinct change for reactions over temperature range 25−250 °C. From Arrhenius plot hydrogen desorption kinetics, apparent activation energies found be 42....