Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (06): 593-597.doi: 10.3866/PKU.WHXB20040608

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The Application of Nano-fibrous Polyaniline in Electrochemical Capacitor

Chen Hong;Chen Jin-Song;Zhou Hai-Hui;Jiao Shu-Qiang;Chen Jin-Hua;Kuang Ya-Fei   

  1. College of Chemistry and Chemical Engineering; 1College of Material Science and Engineering, Hunan University, Changsha 410082
  • Received:2003-10-30 Revised:2004-02-23 Published:2004-06-15
  • Contact: Kuang Ya-Fei

Abstract: Nano-fibrous polyaniline (PANI) film was synthesized by pulse galvanostatic method (PGM) and the electrodes of the nano-fibrous PANI film were used to construct electrochemical capacitor in this paper. The scanning electron microscopy result shows that the nano-fibrous PANI has a diameter of about 100 nm and a length of several micrometers. The PANI electrochemical capacitor was characterized by cyclic voltammetry, galvanostatic charge/discharge and ac impedance in NaClO4+HClO4 mixed electrolyte. The results show that, the supercapacitor constructed by nano-fibrous PANI contains larger capacitance than capacitors constructed by granular PANI, which is prepared by galvanostatic method (GM) with the same deposited charge as PGM. From charge/discharge studies of nano-fibrous polyaniline capacitor, a specific capacitance of 699 F•g-1 and a specific energy density of 54.6 Wh•kg-1 have been obtained at discharge current density of 3.5 mA•cm-2. The PANI supercapacitor also shows little degradation of capacitance after long cycles. All results suggest that the nano-fibrous PANI is a prospect material for supercapacitor.

Key words: Pulse galvanostatic method, Electrochemical capacitor, Nano-fibrous PANI, Specific capacitance