High Performance All-solid Supercapacitors Based on the Network of Ultralong Manganese dioxide/Polyaniline Coaxial Nanowires

摘要

In recent years, thin, lightweight and flexible solid supercapacitors are of considerable interest as energy storage devices. Here we demonstrated all-solid supercapacitors (SSCs) with high electrochemical properties, low self-discharge characteristics based on manganese dioxide/polyaniline (MNW/PANI) coaxial nanowire networks. The synergistic effect of MnO₂/PANI plus the unique coaxial nanostructure of the ultralong nanowires with a highly interconnected network effectively enhance the conductivity and capacitive performance of the SSCs device. The MNW/PANI composite with 62.5% MnO₂ exhibits an outstanding areal specific capacitance reaching 346?mF/cm2 at 5?mV s?1 which is significant higher than most previously reported solid supercapacitors (15.3?mF/cm2–109?mF/cm2) and is close to the that of the best graphene films solid state supercapacitors (372?mF/cm2). In contrast, only 190?mF/cm2 of areal specific capacitance was obtained for the pure MnO₂ NW network. The supercapacitors also exhibited low leakage current as small as 20.1?μA, which demonstrated that the MNW/PANI SSCs have great potential for practical applications.