▎ 摘　　要

For the first time, a simple and rapid sonochemical technique for preparing of pure Cd2SiO4 nanostructures has been developed in presence of various surfactants of SDS, CTAB and PVP. Uniform and fine Cd2SiO4 nanoparticle was synthesized using of polymeric PVP surfactant and ultrasonic irradiation. The optimized cadmium silicate nanostructures added to graphene sheets and Cd2SiO4/Graphene nanocomposite synthesized through pre-graphenization. Hydrogen storage capacity performances of Cd2SiO4 nanoparticle and Cd2SiO4/Graphene nano composite were compared. Obtained results represent that Cd2SiO4/Graphene nanocomposites have higher hydrogen storage capacity than Cd2SiO4 nanoparticles. Cd2SiO4/Graphene nanocomposites and Cd2SiO4 nano particles show hydrogen storage capacity of 3300 and 1300 inAh/g, respectively.