物理化学学报 >> 1998, Vol. 14 >> Issue (08): 704-708.doi: 10.3866/PKU.WHXB19980807

研究论文 上一篇    下一篇

Cu/C-Nafion复合电极上硝基苯的电化学还原

江军华, 陈岚, 吴秉亮, 翟润生   

  1. 武汉大学化学系,武汉 430072|中国科学院大连化学物理研究所,大连 116023
  • 收稿日期:1997-11-10 修回日期:1998-01-12 发布日期:1998-08-15
  • 通讯作者: 江军华

Electrochemical Reduction of Nitrobenzene on the Cu/C-Nafion Composite Electrode

Jiang Jun-Hua, Chen Lan, Wu Bing-Liang, Zhai Run-Sheng   

  1. Chemistry Department,Wuhan University,Wuhan 430072|Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023
  • Received:1997-11-10 Revised:1998-01-12 Published:1998-08-15
  • Contact: Jiang Jun-Hua

摘要:

制备性电解的结果表明,硝基苯在Cu/C-Nafion膜复合电极上的还原产物只有苯胺,可能与电极/Nafion界面的弱酸性环境和其还原中间产物本羟胺在界面的扩散较慢有关.生成苯胺的电流效率随电流密度的增大而减小,随反应液中硝基苯浓度的增大出现一个最大值.这可能是硝基苯的电化学还原过程受某种粒子的扩散控制、峰电流取决于硝基苯在Nafion膜中的溶解度所致.

关键词: 固体聚合物电解质, Nafion膜, 电化学还原, 硝基苯, 苯胺

Abstract:

 The electrochemical reduction of nitrobenzene on the Cu/C-Nafion composite electrode was investigated. The reduction product was only aniline. The high selectivity was related to the weak acid medium at the electrode/Nafion interface and the slow diffusion of intermediates in the menbrane. The electrochemical process was controlled by the diffusion of some species, the current efficiency for aniline decreased with the current density and was dependent upon the dissolution of nitrobenzene in the membrane.

Key words: Solid polymer electrolyte, Nafiom membrane, Electrochemical reduction, Nitrobenzene, Aniline