High performance battery-supercapacitor hybrid energy storage system based on self-doped polyaniline nanofibers

► A new hybrid battery-supercapacitor energy storage system was introduced based on self-doped polyaniline (SDPA) nanostructured as positive shared electrode. ► Activated carbon (AC) was used for broadening working voltage of supercapacitor. ► Simple construction was employed with no need DC-DC converter for voltage adjusting. ► Superior performance was obtained for hybrid energy storage system AC/SDPA/Zn than the pure secondary battery Zn/SDPA.