An insight into the overoxidation of polypyrrole materials
An insight into the overoxidation of polypyrrole materials
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DOI：
10.1016/j.elecom.2008.04.024
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发表时间：
2008-06-01
影响因子：
5.4
通讯作者：
Tran, Thi Tuyet Mai
中科院分区：
文献类型：
--
作者：
Debiemme-Chouvy, Catherine;Tran, Thi Tuyet Mai
在水溶液中，在发生水氧化的阳极电位下，聚吡咯被不可逆地氧化，逐渐形成绝缘材料。本文证明这种过度氧化过程是由于溶剂氧化过程中形成的羟基自由基造成的。事实上，研究表明，在开路电位下，聚吡咯薄膜在芬顿试剂 (H2O2/Fe2+) 产生的羟基自由基的存在下被过度氧化。相反，使用羟基自由基清除剂，例如甲醇和二甲基硫脲，可以提高聚吡咯薄膜在阳极电位下的稳定性。 (C) 2008 Elsevier B.V. 保留所有权利。
In aqueous solution, under anodic potentials at which water oxidation occurs, the polypyrrole is irreversibly oxidized leading progressively to an insulating material. In this paper, it is evidenced that this overoxidation process is due to the hydroxyl radicals formed during solvent oxidation. Indeed, it is shown that, at open-circuit potential, polypyrrole films are overoxidized in the presence of hydroxyl radicals produce by Fenton's reagent (H2O2/Fe2+). On the contrary, the use of hydroxyl radical scavengers, such as methanol and dimethyl thiourea, allows one to increase the stability of polypyrrole films under anodic potentials. (C) 2008 Elsevier B.V. All rights reserved.