152489.fig.007a
(a)
152489.fig.007b
(b)
152489.fig.007c
(c)
Figure 7: The binding energy of molecular hydrogen on charged or neutral fullerenes (a). Optimized hydrogen-fullerene complexes of (b) and (c) with a hydrogen uptake of 6.67 wt% and 8.04 wt%, respectively. From [22].