▎ 摘　　要

Due to the importance of hydrogenation of graphene for several applications, we present an alternative approach to hydrogenate graphene based on density functional theory calculations. We find that a negative perpendicular electric field F can act as a catalyst to reduce the energy barrier for molecular H(2) dissociative adsorption on graphene. Increasing -F above 0.02 a.u. (1 a.u.=5.14x10(11) V/m), this hydrogenation process occurs smoothly without any potential barrier. (C) 2010 American Institute of Physics. [doi:10.1063/1.3456384]