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Three dimensional hydrogel of graphene and MnO2 nanoparticles have been prepared by a twosteps synthesis.At first,nanoparticles of MnO2 were growth onto the both surfaces of the nanosheets of graphene oxide under the assistant of benzyl alcohol in aqueous suspension,and then the composite hydrogel of reduced graphene oxide(rGO)and MnO2 was prepared by a reduction-induced in situ selfassembly.