Symmetric redox supercapacitor with conducting polyaniline electrodes

Polyaniline doped with HCl (Pani-HCl) and LiPF6 (Pani-LiPF6) are prepared and used as the active electrode material of symmetric redox supercapacitors. The system using Et4NBF4 as an electrolyte solution has lower internal resistance and larger specific discharge capacitance, and thus, it is suitable for use in a polyaniline redox supercapacitor. The capacitance of Pani-HCl decreases during not, vert, similar400 cycles and then becomes constant at not, vert, similar40 F g−1. On the other hand, the polyaniline electrode doped with lithium salt like LiPF6 shows a specific discharge capacitance of not, vert, similar107 F g−1 initially and not, vert, similar84 F g−1 at 9000 cycles.