Characterization and Hydrogen Storage of Surface-Modified Multiwalled Carbon Nanotubes for Fuel Cell Application

Figure 9

Hydrogen adsorption curves of (a) 4 wt% Ti-NaAlH₄ + 5 wt% MWCNTs (at 425 K), (b) NaAlH₄ + 5 wt% MWCNTs (at 425 K), (c) 5 wt% Pd-doped MWCNTs (at 298 K), and (d) MWCNTs (at 298 K). The adsorption pressures of as-synthesized hydrogen storage materials of MWCNTs were ranged of 1–30 atm.