Self-Supported PANI@MnO₂ Coaxial Nanowire Network Sponge as a Binder Free Electrode for Supercapacitors

In this paper, we report a novel self-supported PANI@MnO₂ coaxial nanowire network sponge as a binder free electrode for supercapacitors. The as-prepared material has long MnO₂ nanowire core, uniform PANI shell, intertwined nanowire networks and sponge-like structure. Its unique structure promotes the conductivity, electrochemical performance and stability of the material. The specific capacitance of this PANI@MnO₂ coaxial nanowire network sponge electrode was as high as 344 F·g^-1 and maintained about 98.6% of its initial value. Moreover, a high energy density of 86 Wh·kg^-1 at a power density of 400 W·kg^-1 was obtained tested by a symmetric capacitor. This remarkable electrochemical performance indicated its superior application potential in supercapacitors.