Citation:
TIAN Ying, WANG Jing-Ri, LIU Ming, SHI Kun, YANG Feng-Lin. Redox Stability of Polypyrrole in Aqueous Electrolyte Solutions by a Recurrent Potential Pulse Technique[J]. Acta Physico-Chimica Sinica,
;2011, 27(05): 1116-1121.
doi:
10.3866/PKU.WHXB20110515
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The recurrent potential pulse (RPP) technique is an alternative and effective technique for redox stability measurement. We investigated the electrochemical redox stability of polypyrrole (ppy) films doped with sodium p-toluenesulfonate by RPP technique in this study. The reduction charge (Qred) and the ratio of reduction and oxidation charges (Qred/Qox) obtained from the switching potentials in aqueous solutions of H2SO4, Na2SO4, and NaOH were calculated to describe the reversibility of ppy at the applied potential windows. We found that the irreversible overoxidation strongly depended on the pH value of the supporting electrolytes and on the switching potentials. The onset of the overoxidation potential is 0.8 V in H2SO4 solution while it is only 0.5 V in Na2SO4 solution. In NaOH solution, overoxidation occurs at any potential indicating that the existence of OH- ions is directly responsible for overoxidation.
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Keywords:
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Polypyrrole
, - Overoxidation,
- Redox stability,
- Recurrent potential pulse
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