氧在铁卟啉/聚吡咯膜修饰电极上的还原

用旋转环盘电极技术研究含中位四（ 对磺基苯基） 卟啉合铁（ＦｅＴＰＰＳ） 的聚吡咯膜覆盖的玻碳电极上的氧还原过程． 结果表明该修饰膜的存在降低了氧还原的过电位，还原产物中有Ｈ２Ｏ２ ，过程用异相氧化还原催化（ＥＣ） 机理解释． 与金或铂比较，碳是较好的电极基体材料，适合于产生破坏水中有机物所需的过氧化物． 在酸性介质中氧在该膜修饰电极上的还原速度比在中性介质中大，由ＫｏｕｔｅｃｋｙＬｅｖｉｃｈ 关系式求出修饰膜中催化剂和分子氧反应的表观速度常数值．

Reduction of Oxygen on Glassy Carbon Electrode Modified by Polypyrrole Film with Ferriporphyrin

The oxygen electroreduction on the glassy carbon electrode coated by polypyrrole film with ferriporphyrin(FeTPPS) has been investigated by RRDE technique, TPPS standing for meso terakis( p sulfonatophenyl)porphyrin. The results show that the presence of the modified layer decreases the overpotential of oxygen reduction and the reduction product is H 2O 2, which may be used to destroy organic compounds in waste water. Carbon is a better electrode substrate for the peroxide formation, as compared with Au or Pt. The rate of oxygen reduction on the modified electrode in acidic media is higher than that in neutral media. The apparent rate constant for the reaction of oxygen molecule with FeTPPS in the polypyrrole film has been estimated according to Koutecky Levich relationship. The process is explained in terms of the heterogeneous redox cata lysis i.e. EC mechanism.