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Citation: YANG Hong-Sheng, ZHOU Xiao, ZHANG Qing-Wu. Electrochemical Performances of Supercapacitor with Polyaniline Particles with Hierarchy as Active Electrode Material[J]. Acta Physico-Chimica Sinica, ;2005, 21(04): 414-418. doi: 10.3866/PKU.WHXB20050414 shu

Electrochemical Performances of Supercapacitor with Polyaniline Particles with Hierarchy as Active Electrode Material

1.
Institute of Polymer, Department of Chemical Engineering, Tsinghua University, Beijing 100084

Received Date: 24 August 2004
Available Online: 15 April 2005

Polyaniline (PANi) particles with hierarchy are prepared by adding (NH₄)₂S₂O₈ dropwise into aqueous solution containing aniline monomer and HCl acid at 0 ℃ under nitrogen atmosphere with stirring. SEM images show that the resulted PANi particles are composed of their primary particles, which are composed of multi-layer flakes. Symmetric redox supercapacitor (prototype) is assembled with the PANi particles as active electrode materials and 2 mol•L^-1 H₂SO₄ aqueous solution as electrolyte. The electrochemical performances of the supercapacitor are tested with cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. When the charge-discharge current is 7 mA, the specific energy and specific power of the supercapacitor can reach 6.35 Wh•kg^-1 and 132 W•kg^-1 (based on the mass of PANi), respectively；the capacitance of PANi electrode is about 408 F•g^-1 . When the charge-discharge current is 20 mA, the specific energy and specific power of the super-capacitor can reach 4.39 Wh•kg^-1 and 328 W•kg^-1 (based on the weight of PANi), respectively; the capacitance of PANi electrode is about 324 F•g^-1 . During 100 charge-discharge cycles, the discharge capacity of the supercapacitor is constant, and the charge-discharge efficiency is 95%. The results show that the PANi supercapacitor with hierarchial particles as active electrode material can store a great deal of charge and energy in H₂SO₄ solution.
- Polyaniline; Supercapacitor; Electrochemical capacitor; Conducting polymer
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