  Recently we have predicted [Phys. Rev. Lett. May 2005(cond-mat/0504694)] that
Ti-decorated carbon nanotubes can absorb up to 8-wt% hydrogen at ambient
conditions. Here we show that similar phenomena occurs in light
transition-metal decorated C60. While Sc and Ti prefers the hexagon (H) sites
with a binding energy of 2.1 eV, V and Cr prefers double-bond (D) sites with
binding energies of 1.3 and 0.8 eV, respectively. Heavier metals such as Mn,
Fe, and Co do not bond on C60. Once the metals are absorbed on C60, each can
bind up to four hydrogen molecules with an average binding energy of 0.3-0.5
eV/H2. At high metal-coverage, we show that a C$_{60}$ can accommodate six
D-site and eight H-site metals, which can reversible absorb up to 56 H2
molecules, corresponding to 7.5 wt%.
