催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (6): 504-508.

• 研究论文 • 上一篇    下一篇

蒽醌/聚吡咯复合膜修饰电极的电化学行为和电催化活性

张国权,杨凤林   

  1. 大连理工大学环境与生命学院, 工业生态与环境工程教育部重点实验室, 辽宁大连 116024
  • 收稿日期:2007-06-25 出版日期:2007-06-25 发布日期:2011-05-28

Electrochemical Behavior and Electrocatalytic Activity of Glassy Carbon Electrode Modified by Anthraquinone/Polypyrrole Composite Film

ZHANG Guoquan, YANG Fenglin*   

  1. Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2007-06-25 Online:2007-06-25 Published:2011-05-28

PDF

1120

被引次数

68

摘要： 在水溶液中制备了掺杂蒽醌磺酸盐(AQS)的聚吡咯(PPy)/玻碳复合膜修饰电极,采用循环伏安法和旋转圆盘电极技术研究了该修饰电极在不同pH值溶液中的电化学行为以及在pH=5.5的磷酸盐缓冲溶液中对氧还原反应的电催化性能和动力学. 结果表明,与裸玻碳电极相比, PPy膜的存在不仅降低了AQS的反应电位和峰电位差,而且增大了其氧化还原反应的峰电流, H2AQ/HAQ-氧化还原对的电离常数为9.5. AQS/PPy膜修饰电极上氧的还原主要是两电子还原为H2O2的不可逆过程, H2AQ对氧还原反应起主要催化作用,还原过程符合异相氧化还原催化机理. 该修饰电极具有良好的电化学重现性.

关键词: 蒽醌磺酸盐, 聚吡咯, 修饰电极, 氧还原, 电化学, 电催化

Abstract: Conductive and functional polypyrrole (PPy) film was prepared by incorporation of anthraquinonesulphonate (AQS) as dopant during the electropolymerization of pyrrole on a glassy carbon electrode in aqueous solution. The electrochemical behavior of AQS in PPy matrix in various pH buffer solutions and electrocatalytic reduction of oxygen on the resulting polymer film at the optimized pH of 5.5 were studied by using cyclic voltammetry (CV) and rotating disk electrode (RDE) technique. The results showed that PPy not only lowed the AQS reaction potential and the peak potential separation but also increased the redox peak currents. The value of ionization constant for H2AQ/HAQ- is 9.5. The CV and RDE studies showed the involvement of two electrons in oxygen reduction and H2AQ is responsible for the enhanced catalytic activity. The catalytic reaction is in agreement with an electrochemical-chemical mechanism. The AQS/PPy composite film-modified electrode was found to exhibit reproducible results.

Key words: anthraquinonesulphonate, polypyrrole, modified electrode, oxygen reduction, electrochemistry, electrocatalysis