Abstract: Micro-nano structured electrodes had high specific surface area, controllable morphology and unique size-dependent characteristics, which could provide effective active reaction sites, and improve charge transfer and storage during charge/ discharge process, thereby achieving high electrochemical performance in supercapacitors. In this paper, the aniline monomer was dissolved in a weakly acidic p-toluenesulfonic acid/ethylene glycol water mixed solvent, and the aniline monomer was oxidized and polymerized into a oligomer nanosheet template in an ice water bath. And then, the oligomer template was dispersed into the sulfuric acid aqueous solution containing aniline monomer, and ammonium persulfate was used as a water-soluble initiator to further initiate the polymerization reaction, and the flower-like polyaniline (PANI) with nano-hierarchical structure was successfully prepared. Using conductive carbon cloth as the supporting substrate, flower-like PANI was prepared for electrode materials in supercapacitors, and its electrochemical properties were studied. The experimental results showed that the specific capacitance of the flower-like PANI micro-nano structure electrode was about 433 F/g at a current density of 1 A/g. The specific capacitance was only lost by 46.8% when the current density increased from 1 A/g to 10 A /g. The specific capacitance loss was only 48 % after 2000 charge-discharge cycles at 10 A/g. The single device prepared with flower-like PANI had a maximum energy density of approximately 20.65 Wh/kg at a power density of 550 W/kg.

Key words: Polyaniline; Flower-like micro-nano structure, Electrode material, Electrochemical performance, Supercapacitor