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On the pH influence on electrochemical properties of poly(pyrrole) and poly(N-methylpyrrole)

机译：pH值对聚吡咯和聚N-甲基吡咯的电化学性能的影响

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摘要

The electrochemical behavior of poly(pyrrole) doped with chloride (PPy/Cl) and dodecylsulfate (PPy/DS) ions as, well as of poly(N-methylpyrrole) doped with perchlorate anions (PMPy/ClO4) was studied in aqueous electrolyte (KCl) solutions (pH 0.5 to 7). The results indicate that the pH efiPct is dependent on polymer/dopant system properties, although in general the pH change moatly affects the polymer by the change of solution redox potential. Although the studied polymers exhibit different formal potential and ion-exchange properties, open circuit potentials of these films were quite similar. The slope of the open circuit potential dependence on pH was the highest: fur PPy/Cl, but still much below the value expected for the H+ exchange process. The high sensitivity of PPy/Cl films for the pH changes was also observed in impedance measurements. Results obtained for the PPy/Cl system indicate that acidfication of the solution favors lower charge transfer impedances. The: results of voltammetric studies indicate that conditioning of the PPy/Cl layer in neutral solution is accompanied with deprotonation of the polymer film. This effect was less pronounced for the PPy/DS layers probably due to the inhibiting properties of the surface active doping anions, and was not observed for PMPy/ClO4 films. This suggests that hydrogen atom connected with nitro rn atom is involved in the discussed processes. [References: 36]
机译：研究了在水电解质（ KCl）溶液（pH 0.5至7）。结果表明，pH efiPct取决于聚合物/掺杂剂体系的性质，尽管通常pH值的变化会通过溶液氧化还原电位的变化而对聚合物产生影响。尽管所研究的聚合物表现出不同的形式势和离子交换性能，但是这些膜的开路电势非常相似。开路电势对pH的依赖性的斜率最高：为PPy / Cl，但仍远低于H +交换过程的预期值。在阻抗测量中也观察到PPy / Cl膜对pH的高敏感性。 PPy / Cl系统获得的结果表明，溶液的酸化有利于降低电荷转移阻抗。伏安研究的结果表明，在中性溶液中调节PPy / Cl层会伴随聚合物薄膜的去质子化。对于PPy / DS层，此效果不太明显，可能是由于表面活性掺杂阴离子的抑制性能所致，而对于PMPy / ClO4膜则未观察到。这表明所讨论的过程涉及与硝基原子连接的氢原子。 [参考：36]

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