L.-P. Ma, Z.-S. Wu, J. Li, E.-D. Wu, W.-C. Ren, H.-M. Cheng*, 
International Journal of Hydrogen Energy 2009, 34 (5): 2329-2332.  
DOI:10.1016/j.ijhydene.2008.12.079  [PDF] 

Abstract: We evaluate the hydrogen adsorption behavior of the pristine single-layer graphene sheets in a powder form, which was performed at cryogenic and room temperatures. Only 0.4 wt.% and<0 .2 wt.% hydrogen uptake was obtained at 77 k under 100 kpa and room temperature under 6 mpa, respectively, for the pristine graphene sample with a bet specific surface area of 156 m2 g−1. structure/property investigations suggest that the low specific surface area and weak binding to hydrogen should be responsible for the small gravimetric uptake of pristine graphene sample.