Three-dimensional reduced-graphene/MnO₂ prepared by plasma treatment as high-performance supercapacitor electrodes

In this work, three-Dimensional nitrogen-doped graphene/MnO₂ (NG/MnO₂) was prepared by plasma treatment, which provides a high specific surface area due to porous structure and exhibits enhanced supercapacitor performance. The advantage of NG/MnO₂ electrode was obvious compared with reduced graphene oxide/MnO₂ (RGO/MnO₂) which was prepared by traditional hydrothermal method, such as improved electrochemical property and better cycling stability. The specific capacitance of NG/MnO₂ at the scan rate of 5 mV s⁻¹ (393 F g⁻¹) is higher than that of RGO/MnO₂ (260 F g⁻¹). In addition, NG/MnO₂ showed higher durability with 90.2% capacitance retention than that of RGO/MnO₂ (82%) after 5000 cycles. Such cheap and high-performance supercapacitor electrodes are available by our feasible plasma treatment, which give promise in large-scale commercial energy storage devices. (paper)