论文摘要
本文利用循环伏安的方法,在不同条件下制备了聚苯胺(PANI)薄膜,并在弱酸性、中性及碱性条件下研究了其电化学性能。利用红外光谱(FT-IR)、能谱分析(EDX)研究了PANI的组成。通过循环伏安实验研究了PANI在1.0 mol/L KOH溶液中的电化学性能。实验结果表明,在-1.2~0.2 V电位范围内,PANI在1.0mol/L KOH溶液中具有良好的电化学性能,OH-能够在聚合物中进行掺杂和反掺杂。研究了PANI在0.5 mol/L H2SO4,0.5 mol/L Na2SO4,1.0 mol/L NaNO3,1.0 mol/L NaCl,1.0 mol/L十二烷基苯磺酸钠(SDBS)溶液中的电化学性能。实验结果表明,在-1.2~0.6 V电位范围内,PANI在0.5 mol/L H2SO4, 0.5 mol/L Na2SO4,1.0 mol/L NaNO3,1.0 mol/L NaCl,1.0 mol/L十二烷基苯磺酸钠溶液中均具有电化学活性,其氧化还原与对阴离子掺杂与反掺杂有关。在含0.5 mol/L Na2SO4的不同浓度KOH溶液中进行的循环伏安实验结果表明,OH-比SO42-易于在聚合物中掺杂。研究了H+掺杂对PANI电化学活性的影响,发现KOH溶液中循环伏安扫描,或在含KOH体系电化学聚合时掺杂进入PANI的OH-,可在H2SO4溶液中循环伏安扫描(或浸泡)过程中被H+中和。H+中和影响了聚合物中活性位的分布,进而影响PANI的电化学活性。能谱分析证实了SO42-, Cl-, SDB-在PANI中的掺杂。PANI的红外光谱上出现了其特征吸收峰。
论文目录
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