Improvement of Capacitance Retention Using N-doped Activated Carbon Fibres as Electrodes in Electrochemical Supercapacitors

摘要

N-doped activated carbon fibres have been synthesized by using a simple chemical polymerization method. Commercial activated carbon fibres (A20) were impregnated with aniline monomer and then, they were polymerized chemically, obtaining a thin film of polyaniline (PANI) inside the microporosity of the carbon fibres. Subsequently, activated carbon fibres with polyaniline were carbonized at different temperatures producing activated carbon fibres with a small amount of nitrogen groups. It is known that the nitrogen groups enhance the electrochemical performance of the prepared electrodes for supercapacitors applications. Symmetric capacitors were tested in a two-electrode cell configuration, using triethylmethylammonium tetrafluoroborate/propylene carbonate (TEMA-BF4/PC) as electrolyte. The main purpose of this work was to study the effect of nitrogen species in the degradation/stabilization of the capacitor. The