Aniline Oligomer-Based Solid-State Asymmetric Supercapacitors with Enhanced Electrochemical Performances
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This work presents solid-state asymmetric supercapacitors (ASCs), composed of aniline oligomers as a cathode, nonoxidative graphene sheet as an anode, and polyvinyl alcohol-potassium hydroxide gel (PVA-KOH) as an electrolyte. Aniline oligomers were synthesized as aniline dimer, aniline trimer, and aniline tetramer which have significant role in determining electrochemical properties of ASCs. The aniline tetramer with an appropriate chain length provided higher carrier transport within the anode compared to that of the aniline dimer and trimer. The ASC composed of aniline tetramer/graphene sheet exhibited high areal capacitance (62.2 mF/cm2), volumetric capacitance (207.4 F/cm3), and good cycling stability (97.2% after 2000 cycles and 90.4% after 10000 cycles).