Nanoscale Structures and Hydrogen Storage Capacity of Fe-C-H Produced by Milling Graphite with Steel Balls in a Hydrogen Atmosphere

Table 2

Results of elemental analysis of graphite nanocrystals milled in a hydrogen atmosphere.

Milling time (h)	H/C (wt%)	Fe/C (wt%)
0	2.4	0.0
10	5.6	3.1
20	4.9	3.3
40	5.7	2.5
80	5.0	3.0