Three-dimensional MnCo2O4/graphene composites for supercapacitor with promising electrochemical properties

Abstract A three-dimensional (3D) porous structure that designed based on MnCo 2 O 4 decorated graphene was synthesized by a two-step method. The precursor was prepared of MnCo 2 O 4 by solid phase synthesis method, then in the hydrothermal reaction course, the graphene nanosheets as well as this precursor were self-assembled into a 3D interconnected network. The resultant composite materials present a higher specific capacitance (503 F g −1 at 1 A g −1 current density) and an excellent cycling stability. After 5000 charge/discharge cycles at a current density of 10 A g −1 , 97.4% of the specific capacitance was retained. Thus, this material has a promising application potential for supercapacitor, at the same time, this synthetic method can also provide an idea for synthesizing composites based on 3D graphene in the future.