High-performance solid-state supercapacitors based on graphene-ZnO hybrid nanocomposites
1 Institute of Nano Functional Materials, Huanghe University of Science & Technology, Zhengzhou 450006, People's Republic of China
2 School of Physics & Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People's Republic of China
3 School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China
Nanoscale Research Letters 2013, 8:473 doi:10.1186/1556-276X-8-473Published: 12 November 2013
In this paper, we report a facile low-cost synthesis of the graphene-ZnO hybrid nanocomposites for solid-state supercapacitors. Structural analysis revealed a homogeneous distribution of ZnO nanorods that are inserted in graphene nanosheets, forming a sandwiched architecture. The material exhibited a high specific capacitance of 156 F g−1 at a scan rate of 5 mV.s−1. The fabricated solid-state supercapacitor device using these graphene-ZnO hybrid nanocomposites exhibits good supercapacitive performance and long-term cycle stability. The improved supercapacitance property of these materials could be ascribed to the increased conductivity of ZnO and better utilization of graphene. These results demonstrate the potential of the graphene-ZnO hybrid nanocomposites as an electrode in high-performance supercapacitors.