Electrochemical Properties of PANI as Single Electrode of Electrochemical Capacitors in Acid Electrolytes

Haihua Zhu,Shunjin Peng,Weijie Jiang

doi:10.1155/2013/940153

Haihua Zhu, Shunjin Peng + Show 1 more

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https://doi.org/10.1155/2013/940153

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Abstract

The polyaniline (PANI) powder with globular sponge-like morphology was prepared by chemical solution polymerization, and its morphology and chemical structure were characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR), respectively. The single electrode of electrochemical capacitor was made using the prepared PANI powder as active material and carbon paper as current collector. Electrochemical properties of PANI as a single electrode in 1 M HCl and 1 M H2SO4 electrolyte solution were tested by galvanostatic charge/discharge (GCD) and cyclic voltammetry (CV) techniques. It has been found that PANI has higher specific capacitance of 302.43 Fg−1, higher specific energy of 54.44 Wh·kg−1 at 0.5 Ag−1, and higher working potential in 1 M HCl than those in 1 M H2SO4.

Highlights

PANI as a conducting organic material has attracted great attentions of researchers due to its good environmental stability [1, 2], moderately high conductivity upon doping with simple protonic acid [3], lower production cost, and easy synthesis compared with other conducting polymers [4], such as polypyrrole and polythiophene
Electrochemical capacitor is usually well known as a novel energy storing system, and it is quite promising in electronic area due to its excellent properties compared with batteries and traditional static capacitors, such as high power density and energy density
(c) Figure 2: scanning electron microscope (SEM) images of PANI ((a) original PANI; (b) PANI immersed in 1 M HCl; (c) PANI immersed in 1 M H2SO4)

Summary

Introduction

PANI as a conducting organic material has attracted great attentions of researchers due to its good environmental stability [1, 2], moderately high conductivity upon doping with simple protonic acid [3], lower production cost, and easy synthesis compared with other conducting polymers [4], such as polypyrrole and polythiophene. Electrochemical capacitor is usually well known as a novel energy storing system, and it is quite promising in electronic area due to its excellent properties compared with batteries and traditional static capacitors, such as high power density and energy density. Their power density could be 10 times higher than ordinary batteries, and energy density could be dozens of times higher than that of traditional capacitors [12]. A great number of works studied the influence of supporting acid electrolytes on PANI from electrochemical polymerization as a single electrode of the electrochemical capacitor in past years [17, 24], while there is few work for the PANI from chemical polymerization. In this research, we prepared globular spongelike PANI grain by chemical methods and studied the electrochemical behaviors of PANI powder as a single electrode of electrochemical capacitor in 1 M HCl and 1 M H2SO4

Experimental

Results and Discussion

Electrochemical Performance of PANI

Conclusion