Preparation of Poly(7-formylindole)/carbon Fibers Nanocomposites and Their High Capacitance Behaviors

摘要

Polyindoles belonging to the fused-ring family have attracted extensive investigation as promising materials due to their unique physical and electrochemical properties. Herein, poly(7-formylindole) (PFIn) film was firstly synthesized electrochemically on carbon fibers by direct anodic oxidation of 7- formylindole in acetonitrile solution containing 0.1 M LiClO4. FT-IR spectra indicated that the polymerization site of monomer happened at the C2 and C3 positions of indole ring. The morphology of PFIn film on carbon fibers was investigated through SEM observation, which indicated that PFIn film tightly wrapped over carbon fibers (PFIn/CF). Electrochemical results indicated that PFIn/CF electrode showed a remarkable specific capacitance of 637 F g-1 at 20 A g-1. The energy density reached about 42 Wh kg-1 at a high power density of 21 kW kg-1. Furthermore, PFIn/CF still maintained about 74.1% of initial specific capacitance and 100% coulombic efficiency after 1000 cycles. These results revealed that PFIn/CF was a promising electrode material for the flexible supercapacitors application.