Porous Carbon Nanotubes Thermally Transformed from Polyaniline Nanotubes with High Electrochemical Performance

摘要

In this work, a kind of novel doped activated carbon nanotubes (DACN) were prepared via the carbonization and activation of polyaniline (PANI) nanotubes synthesized by a rapidly mixed reaction for pursing of high performance supercapacitor electrodes. The pore structures and the content heteroatom functional groups are highly dependent on the thermal treatment process mainly determined by the calcination temperatures. The optimized structure of the DACN as supercapacitor electrodes is obtained through investigating the influence of the pore structures and the heteroatom functional groups. A high capacitance of 468 F g~(?1) at a current density of 0.1 A g~(?1) with excellent rate capability in KOH solution was achieved using the DACN obtained at 700° C treatment of the PANI nanotubes. Such a high capacitance was originated from those high density pores integrated on the DACN behaving as ion transfer pass ways during the charge/discharge processes. The presence of functional groups can provide the pseudocapacitance effect by redox between electrodes and electrolyte.