Structure, morphology and hydrogen storage properties of composites prepared by ball milling Ti0.9Zr0.2Mn1.5Cr0.3V0.3 with La-Mg-based alloy

摘要: Abstract Hydrogen storage alloy composites Ti 0.9 Zr 0.2 Mn 1.5 Cr 0.3 V - x wt % La 0.7 Mg 0.25 0.05 ( Ni 0.85 Co 0.15 ) 3.5 = 0 , 5 10 were prepared by ball milling method. Their structures, morphologies and the hydrogen characteristics intensively studied in present work. It was found that bulk of maintained hexagonal C14 Laves phase structure after with additional La–Mg-based for two hours. Scanning electron microscopy (SEM) observations revealed average size particles reduced to several hundred nanometers process. Energy dispersive X-ray spectrometer (EDS) patterns showed uniformly distributed on surface . The absorption–desorption improved increasing dispersivity particles. Pressure–composition–temperature (PCT) measurements pressure plateau hysteresis decreased x. Among these composites, sample exhibited more significant performances. Its absorption desorption 0.547 0.302 MPa, respectively, which much lower than those alloy. Moreover, it took only 200 2500 s reach constant reaction. These improvements can be attributed preferable also formation micro-crack milling. Both factors synergetically facilitate diffusion atoms accelerate dissociation molecules recombination during