Hydrogen Uptake of Mechanically Milled LaNi5-MWCNTs Nanocomposite
LaNi5-MWCNTs nanocomposite was prepared by high-energy ball milling and their hydrogen storage capacity
properties were studied by employing Sievert’s volumetric instrument. Crystal structure, thermal stability, quantity, and
nanostructured characterization of pristine and composite samples were performed by X-ray diffraction pattern,
thermogravimetric and differential thermal analysis, field emission scanning and transmission electron microscopy methods.
Channel and pore blocking of MWCNTs by LaNi5 during synthesis method explains reduction of surface area of composite.
Hydrogen uptake of commercial LaNi5, pristine MWCNTs, and LaNi5-MWCNTs nanocomposite was found to be 1.49, 0.07,
and 1.53 wt.% measured at RT and hydrogen pressure of 4.0 MPa. Ball milling process and addition of MWCNTs to LaNi5
alloy proved to be very critical to improve kinetics.
Keywords - Ball milling, Hydrogen storage; Nanocomposite; Crystal structure; Kinetics