High-performance supercapacitor based on ternary nanocomposite of MnO2-polyaniline-graphene electrode

A ternary nanocomposite of MnO2-PANi-rGO was designed and fabricated via a facile chemical method. Using various spectroscopy and microscopy methods, morphology and structure of this nanocomposite were studied. Also, electrochemical measurements demonstrated a specific capacitance of 422 F g-1 at a current density of 5.7 A g-1 in a three-electrode configuration, which is much higher than that of each single component of nanocomposite. In addition, over 85% of the initial capacitance was preserved after at least 2000 charge/discharge cycles, demonstrating a high cycling stability [1]. An asymmetric supercapacitor was also made with MnO2-PANi-rGO nanocomposite as the positive electrode and graphene oxide as the negative electrode. More importantly, the asymmetric supercapacitor offered a high energy density without depriving power density. This asymmetric supercapacitor had a capacitance preservation of 90% over 2000 charge/discharge cycles[1]. The extraordinary electrochemical performance of the ternary nanocomposite was ascribed to the synergistic effects between individual components and its well-designed nano-networked structure[2, 3, 4].