A novel composite for energy storage devices: core-shell MnO_2/polyindole nanotubes supported on reduced graphene oxides

摘要

Abstract Nanomaterials for energy storage and transfer devices like supercapacitors and batteries have been widely researched on the purpose of obtaining desirable performances. A novel hybrid nanocomposite based on tubular MnO~(2), polyindole and reduced graphene oxides was synthesized by a simple method and the optimal mass ratio of each raw material was researched in this work. This sandwich-like structure caused by RGO sheets and coaxial MnO~(2)/polyindole nanotubes results in fast electron and ions transfer and high contacting area. This ternary composite exhibits a satisfactory electrochemical performance with large specific capacitance of 522.5 F g_(−1)at a scan rate of 10 mV s_(−1)and outstanding cycling stability of 97.65% capacitive retention after 5000 cycles at a current density of 10 A g_(−1). Therefore, MnO~(2)/PIn/RGO composite owns promising applications in high-performance supercapacitors and other energy storage devices.