▎ 摘　　要

Graphene was chemically prepared using microwave irradiation. Aniline was electropolymerized over graphene immobilized on glassy carbon substrate potentiostatically in a three-electrode-one compartment cell. A systematic study of chemically converted graphene/PANI composites in both monomer free solution and potassium ferricyanide/ferrocyanide redox system was performed. The resulted chemically converted graphene/poly(aniline) (CCG/PANI) composite was characterized using surface techniques such as field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM). The effect of different dopants on the electrochemical behavior of CCG/PANI in several protonic acids was also investigated. The diffusion coefficients of proton and counterion (anion) as well as the average diffusion coefficients in these protonic acids were calculated. The results revealed that the presence of graphene enhances the electrochemical performance of PANI in both monomer free solution and potassium ferricyanide. A synergetic electrocatalytic effect resulted when combining PANI and CCG as manifested by a noticeable increase in current signals.