Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (3): 571.

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Preparation and Capacitive Performance of TSA-PANI/PNR Composites by Emulsion Polymerization

XU Hai-Li, CAO Qi*, WANG Xian-You, CHEN Quan-Qi, LIAO Li   

  1. College of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiangtan University, Xiangtan 411105, China
  • Received:2009-05-31 Online:2010-03-10 Published:2010-03-10
  • Contact: CAO Qi. E-mail: wjcaoqi@163.com
  • Supported by:

    环境友好化学与应用教育部重点实验室课题(批准号: 10HJYH09)资助.

Abstract:

Using paratoluenesulfonic acid(TSA) as dopant and emulsifier, and ammonium persulfate(APS) as initiator, the composites of polyaniline, TSA and neutral red(TSA-PANI/PNR) were synthesized by emulsion polymerization. The structure and morphology of the composites were investigated by X-ray diffraction(XRD) and scanning electron microscopy(SEM). Symmetric redox supercapacitor was assembled with TSA-PANI/PNR as active electrode material and an l mol/L H2SO4 aqueous solution as electrolyte. The electrochemical performances of the supercapacitors were characterized by galvanostatic charge-discharge, cyclic voltammetry and A.C. impedance spectroscopy. The results show that TSA-PANI/PNR composite exhibits outstanding electrochemical capacitor performance compared with TSA/PANI electrode. The specific capacitance measured from cyclic voltammetry is 1350 F/g for TSA-PANI/PNR composite material and 1038 F/g for TSA/PANI at 1 mV/s scan rate; the initial specific capacitance of the TSA-PANI/PNR supercapacitor is about 348 F/g at a constant current of 5 mA. Meanwhile, the retention of the capacitance after 1000 charge-discharge cycles was 87%.

Key words: Polyaniline; Poly(neutral red); Copolymerization; Paratoluenesulfonic acid; Emulsion polymerization; Supercapacitor

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