Effects of counter-ions on the electropolymerization behaviors and properties of polyaniline

• Published in: International journal of electrochemical science Vol. 16; no. 12; p. 211212
• Main Authors: Xu, Han, Wu, Xiaonan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2021
• Subjects: capacitive behaviors; counter-ions; EIS; electropolymerization; polyaniline; electropolymerization; capacitive behaviors; counter-ions; polyaniline; EIS
• ISSN: 1452-3981; 1452-3981
• DOI: 10.20964/2021.12.08

Conductive polymer of polyaniline (PANI) was prepared by potentiostatic electropolymerization technique onto Au at 25°C in a series of solutions containing NO3-, SO42-, Cl-, ClO4- and PO43-，respectively. The effects of different counter-ions on the electropolymerization behaviors and capacitive behaviors of PANI films were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) electrochemical measurements. As a result, the difficulty of electropolymerization of aniline in electrolytes containing different kinds of counter-ions from high to low is in the order: NO3- > SO42- > ClO4- > Cl- > PO43-, while the rate of electropolymerization of aniline in electrolytes containing different kinds of counter-ions from high to low is in the order: SO42- > NO3- > Cl- > ClO4- > PO43-. The order of the conductivity of pAn films obtained in solutions containing different counter-ions from high to low is: PANI/HNO3 > PANI/H2SO4 > PANI/HCl > PANI/HClO4> PANI/H3PO4. The order of the charge storage ability of PANI obtained in different solutions from high to low is: PANI/H2SO4> PANI/HNO3 > PANI/HCl > PANI/HClO4> PANI/H3PO4.