Electrochemical Response to Dissolved Hydroquinone on Insulating Polyaniline-modified Electrode in Less Acidic Solution and Enhancement of the Conductivity of Polyaniline

Electrochemical Response to Dissolved Hydroquinone on Insulating Polyaniline-modified Electrode in Less Acidic Solution and Enhancement of the Conductivity of Polyaniline

Jun Yano 

Department of Engineering Science, Niihama National College of Technology, Yagumocho 7-1, Niihama, Ehime 792-8580

Corresponding Author Email: 
yano@sci.niihama-nct.ac.jp
Page: 
237-239
|
DOI: 
https://doi.org/10.14447/jnmes.v15i4.36
Received: 
25 November 2011
|
Accepted: 
7 February 2012
|
Published: 
17 February 2012
| Citation
Abstract: 

A conductive polymer, polyaniline (PANI), was easily prepared on an electrode surface as a stable film by the electropolymerization of aniline in acidic solution. In McIlvain’s buffer solution with a pH that exceeded 4, no redox current by the dissolved species was observed on the PANI-modified electrode because PANI acted as an electric insulator. However, in a less acidic solution, the redox current of the dissolved hydroquinone was evident because hydroquinone selectively permeates through the PANI film to reach the electrode substrate. The results of steady-state current-potential curves for the oxidation of hydroquinone using a PANI pellet electrode revealed that hydroquinone was concentrated in the PANI during the electro-oxidation. Furthermore, the concentration of hydroquinone increased the electric conductivity of the PANI from 6.50×10-7 S/cm to 2.73×10-3 S/cm.

Keywords: 

electrodeposition, less acidic solution, polyaniline, hydroquinone, conductivity.

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusions
Acknowledgements

Financial support by the Ogasawara Foundation for the Promotion of Science & Engineering is gratefully acknowledged.

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