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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (23): 2793-2796. 上一篇    下一篇

研究简报

PANI/La2O3复合纳米材料的合成及其电化学降解的抑制作用

王军*, 孙竹, 闻玉凤, 杨冬梅   

  1. (东北大学化学系 沈阳 110004)
  • 投稿日期:2007-03-25 修回日期:2007-06-18 发布日期:2007-12-14
  • 通讯作者: 王军

Synthesis of PANI/La2O3 Nanocomposite and Depression Effect on Electrochemical Degradation

WANG Jun*; SUN Zhu; WEN Yu-Feng; YANG Dong-Mei   

  1. (Department of Chemistry, Northeastern University, Shenyang 110004)
  • Received:2007-03-25 Revised:2007-06-18 Published:2007-12-14
  • Contact: WANG Jun

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作为离子型表面活性剂, 对-甲基苯磺酸可用于氧化镧的预超声分散处理, 同时还可作为质子酸对聚苯胺(PANI)进行掺杂, 从而赋予聚苯胺导电性. 采用化学法合成了聚苯胺/氧化镧复合纳米材料, 用四探针法测定了材料的电导率, 用扫描电镜、电子能谱、X射线衍射、红外光谱等检测分析手段对材料进行了表征. 结果表明, 聚苯胺及聚苯胺/氧化镧复合纳米材料的电导率分别为1.0•和1.9 S•cm－1, 粒子直径分别约为200和50 nm. 氧化镧的掺杂未降低聚苯胺的电导率, 并使粒径减小. 循环伏安实验结果说明, 氧化镧的掺杂可提高氧化还原峰的电流密度, 并能有效抑制聚苯胺在0.25～2.0 mol•L－1的H2SO4及H3PO4水溶液中的电化学降解.

关键词: 聚苯胺(PANI), La2O3, 复合纳米材料, 电导率, 循环伏安, 电化学降解

As a kind of surface-active agent, toluene-p-sulfonic acid (p-TSA) could be used to pre-disperse La2O3. On the other hand, p-TSA was also a protonic acid. The electric conduction of polyaniline (PANI) could be obtained by doping with it. According to these properties, PANI/La2O3 nanocomposite was synthesized by a chemical method. The electrical conductivity was measured by a four probe method. The nanocomposite was characterized by SEM, EDS, XRD and FT-IR. The result indicated that the electrical conductivity of PANI and PANI/La2O3 were 1.0 •and 1.9 S•cm－1, the particle diameters were about 200 and 50 nm, respectively. The doping of La2O3 could reduce the diameter, and meanwhile did not lower the conductivity of PANI. The products were also characterized by cyclic voltammetry. The result showed that doping of La2O3 raised oxidative (and reductive) peak current densities and restrained the electrochemical degradation of PANI in aqueous solutions containing 0.25 to 2.00 mol•L－1 sulfuric acid or phosphoric acid•.

Key words: PANI, La2O3, nanocomposite, electrical conductivity, cyclic voltammetry, electrochemistry degradation