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 shu

Redox Stability of Polypyrrole in Aqueous Electrolyte Solutions by a Recurrent Potential Pulse Technique

1.
1. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China;
2. Dalian Shengshi Environmental Co. Ltd., Dalian 116600, Liaoning Province, P. R. China;
3. Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China

Received Date: 1 December 2010
Available Online: 1 April 2011
Fund Project: 国家自然科学基金(51078050)资助项目 (51078050)

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 (Q_red) and the ratio of reduction and oxidation charges (Q_red/Q_ox) 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.
- Polypyrrole,
- Overoxidation,
- Redox stability,
- Recurrent potential pulse
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